UHMWPE Skived Film

UHMW Polyethylene Film has extremely high abrasion resistance, exceeding the abrasion resistance of steel. Coupled with broad chemical resistance and low coefficient of friction makes UHMW an extremely versatile engineering material for many severe service applications. Slippery like Teflon® Fluoropolymer, but super abrasion & wear resistant. UHMW Polymers have a molecular weight average 10 times that of conventional high density polyethylene resins. Higher molecular weight gives UHMW Polymers its unique combination of characteristics Applications: Inner and outer surfaces for potable water, chemical, fuel and hydraulic hoses, bottom surfaces for skis and snow boards, linings for chutes to decrease friction and wear.

Commercial skived film of ultra-high molecular-weight polyethylene (UHMWPE) with high uniaxial orientation1 was studied during melting and crystallisation with a time-resolution of 30 s in order to identify the crystallisation mechanisms . 

It was found that isotropic crystallisation occurs whenever the melt is heated to 140◦C or above. Oriented crystallisation occurs, if the melt is kept at 138◦C or below. An optimum melt annealing temperature appears to be 136◦C. At this temperature the semicrystalline nanostructure of the original film is completely erased, whereas the orientation memory of the melt is preserved. Moreover, isothermal crystallisation cannot be initiated at a temperature of 110◦C and higher. At a temperature of 105◦C oriented crystallisation starts after 2.5 min. Lamellae with slowly decreasing thickness are growing during an isothermal period of 20 min. 

During the following non-isothermal crystallisation (cooling rate: 20◦C/min) small crystalline blocks with next-neighbour correlation are formed. Thus the crystallisation mechanisms are similar to those found with other polyethylene materials with sufficiently high chain entanglement density studied earlier, except for the considerable undercooling required for the initiation of isothermal crystallisation.

Analysis of the data in real space by means of the multidimensional CDF has been performed. During the melting of the material the average thickness of the crystalline layers remains constant (27 nm), while the long period is strongly increasing from 60 nm to 140 nm. Because the analysis shows that even the original nanostructure is dominated by next-neighbour correlations only this means that the stability of a lamella is monotonously increasing as a function of the distance to its neighbours. While the original structure exhibits extended lamellae, the recrystallised domains are not wider than the distance between them in fibre direction s3.

Applications include lining of conveyor, guide rails, chute liners, chain guides, drawer glides and noise reduction. Excellent abrasion and wear resistance.

Source:https://www.sukoptfe.com/melting-and-application-uhmw-pe-skived-film

Plastic Materials

Plastic Materials

There are a wide variety of resins available to the plastic extrusion industry, but two major categories in particular make up the large majority of resins – thermosets and thermoplastics.

A vast number of plastic materials make up subgroups of thermosets and thermoplastics. These include, but are not exclusive to, many different types of resins that Plastic Extrusion Technologies uses to create products for our clients, such as:

• ABS – a type of Acrylonitrile-Butadiene-Styrene plastic
• PC/ABS – a polycarbonate/ABS composite
• Acrylic – a clear plastic that often resembles glass
• Hytrel – an elastomer with the flexible properties of rubber
• E.V.A. – an elastic polymer that can be processed like a thermoplastic
• Flexible PVC & Rigid PVC – Often used in construction, for tubing or as wire
• Polypropylene – Excellent impact resistance in cold weather applications
• Polyethylene – High and Low density Polyethylene resins are known for their high chemical resistance properties
• TPR/TPO – Thermal Plastic Rubber / Olefin resins used most often in automotive and sealing gasket applications. Excellent cold temperature properties. Also a good alternative to certain thermoset rubbers. Able to be colored.
• Nylon 6 – Resin known for its toughness and resistance to wear
• Noryl – Resin with excellent electrical characteristics. Good for high temperature applications where RPVC fails.
• Polycarbonate – Resin that has excellent impact resistance and clarity

PTFE Absorption Properties

In contrast to metals, plastic and elastomers absorb varying quantities of the materials they contact, especially organic liquids. Absorptivities in PTFE are unusually low, and a chemical reaction between the plastic and the other substances is a rarity (with the few exceptions noted previously). However, when absorption is combined with other effects, this property can influence the serviceability of these resins in a particular chemical environment. For example, if rapid fluctuations in temperature or pressure occur, circumstances may be created that are physically damaging. The wider service temperature range for PTFE resins exposes them to this type of physical damage more frequently that other plastics.

By way of explanation, let us consider the “steam cycle” test described in ATSM standards* for lined pipe. Samples of lined pipe are subjected to 0.8MPa (125 psi) steam, alternating with low pressure cold water, causing very severe thermal and pressure fluctuations indeed. This is repeated for 100 cycles. Steam created a pressure and temperature gradient through the liner causing absorption of a small quantity of steam which condenses to water within the liner wall. On pressure release, or on reintroduction of steam, the entrapped water can expand to vapor causing an original micro pore. The repeated pressure and thermal cycling enlarges the micro pores, ultimately causing visible water-filled blisters within the liner. The ASTM standards note that the blisters do not adversely affect pipe liner performance – the chemical barrier thickness is still intact.

Similarly, in an actual process, the plastic component may absorb process fluids and repeated temperature or pressure cycling can then cause blisters. Such an occurrence may be surprising to one familiar with the extreme chemical inertness of PTFE. This effect is not seen in metals because they fail mainly by corrosion. It is rarely seen in most other plastics and elastomers because temperatures above the boiling point of liquid chemicals are normally beyond their capability. Hence this effect is new to most corrosion engineers and chemical processors, and requires new understanding for proper selection, design, testing, and use of these fluoro-polymers. Further clarification is contained in the section on testing.

There are corrosive measures which reduce the severity of blistering. Thermal insulation of a lined pipe or vessel reduces the temperature gradient in the liner, thereby often preventing condensation and subsequent expansion of absorbed fluids. It also reduced the speed and magnitude of temperature changes, thereby minimizing blistering. Thus, by reducing the resin, insulation can provide a protective measure in many cases. Additional protection can be provided by using operating procedures or devices which limit the rate of process pressure reductions or temperature increases.

Related effects can occur with process materials which may be absorbed and subsequently react, decompose or solidify within the structure of the existing plastic. Prolonged retention of absorbed chemicals can lead to their decomposition within the fluorocarbon component. Absorbed monomers can polymerize similarly. Although unusual, these events can happen, emphasizing the value of in-process testing.

PTFE Molecular Conformation and Crystal Structure

PTFE is a linear chain polymer of great molecular length. The linearity is indicated by an analysis of the infra-red spectrum and by the fact that the powder as produced in the polymerisation reaction is very highly crystalline, with crystalline weight fractions of 0.90 to 0.95 being indicated by density, infra-red and X-ray diffraction measurements. Energy considerations also suggest that branching by chain transfer is unlikely.

The crystal structure and chain conformation have been discussed by Bunn and Howells  and later by others. The crystalline melting point of sintered PTFE is about 327°C (620°F) and of unsintered material 332-346°C (630-655°F) but there are two reversible first order transitions at lower temperatures,19°C and 30°C (66°F and 86°F), which together involve a 1% change in density .Three crystalline phases are observed at atmospheric pressure: phase I (< 19°C; 66°F), phase ll (19-30°C; 66- 86°F) and phase lll ( >30°C; 86°F).

Below the 19°C (66°F) transition, the chain repeat distance is 16.8 Å and the CF2 groups are equally spaced along the chain which is twisted to form a helix on which successive carbon atoms lie, thirteen carbon atoms being involved in a twist of 180°.Between 19 and 30°C (66 and 86°F) the repeat distance increases to 19.5 Å  corresponding to a twist of 15 carbon atoms in 180°. Above 30°C (86°F), further disorder sets in and although the molecular conformation prevailing at lower temperatures is maintained, the chains are displaced or rotated along their long axes by variable amounts which increase as the temperature is raised further. The reason for the helical structure is the necessity to accommodate the large fluorine atoms (van der Waals radius 1.35 Å).The rotation at each chain bond, with the slight opening up of the bond angles to 116°, relieves the overcrowding and permits the shortest F-F distance to be 2.7 Å.

Further studies by various authors have examined the effect of pressure on the room temperature transitions and the melting point. A study of pressures above-atmospheric revealed a 2% increase in density below 19°C (66°F). This fourth crystalline phase has been labelled phase lll by Weir. A triple point exists at about 70°C (158°F) and 4.5 kilobars.The heats of transition were also determined by Yasuda and Araki; dilatometric and calorimetric studies have in addition been reported by other workers.

Materials of Construction (Thermoplastics)

Materials of Construction (Thermoplastics):Teflon® PTFE (Polytetrafluoroethylene),PVDF (Polyvinylidene Fluoride),PP (Polypropylene),CPVC (Chlorinated Polyvinyl Chloride),PVC (Polyvinyl Chloride)

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PVC (POLYVINYL CHLORIDE)

The most economical and largest selection of Chemline valves are moulded from PVC. It offers excellent mechanical and chemical resistance properties at low cost. The working temperature range of PVC valves is 0 to 60°C (30 to 140°F).
PVC used for Chemline valves is identified by cell classification number 11564-A as per ASTM Standard D 1784. The suffix “A” refers to the highest chemical resistance rating. Most other PVC valves as well as pipe and fittings have only a “B” chemical resistance rating.
The special PVC “A” compound used in Chemline valves resists attack of most acids, strong alkalais, salts and many other chemicals. High chemical resistance of this material allows its application on aggressive services such as 98% H2 SO4 , dry chlorine and low pressure wet chlorine gas. PVC is attacked by chlorinated hydrocarbons, ketones, esters and some aromatic compounds. It can be used on solutions containing up to 1000 ppm solvents.
Chemline PVC valves are non-toxic. They meet CSA standard B137.0 for toxicity.
They are resistant to damaging effects of sunlight and weathering, thus painting is not necessary.

CPVC (CHLORINATED POLYVINYL CHLORIDE)

CPVC is very similar to PVC in mechanical properties and chemical resistance. It is suitable for applications from 0 to 95°C (30 to 200°F).
The special CPVC compound used for Chemline valves is classified as 23567-A as per ASTM D 1784. The suffix “A” denotes conformance to the highest chemical resistance rating. The compound is non-toxic, conforming to CSA toxicity standard B137.0.
CPVC valves have proven to be an excellent choice for applications at temperatures too high for PVC or when an extra margin of safety is required.

PP (POLYPROPYLENE)

PP is light weight and high in chemical resistance. Valves are suitable for service from -20 to 90°C (-5° to 195°F). PP is unaffected by alkalais, salts, organic solvents and most acids, particularly hydrochloric and phosphoric acid. It is unsuitable on strong acids, chlorinated hydrocarbons, aromatic compounds and high concentrations of free chlorine.
PP is very inert thus popular for high purity applications such as deionized water, etc. The material comes normally opaqued by addition of grey-beige pigment to prevent ultraviolet light penetration. Natural translucent material without pigment will degrade if exposed to UV light (sun light). Chemline offers PP pipe, fittings and valves in pigmented and unpigmented PP, both approved by the FDA for contact with food.

PVDF (POLYVINYLIDENE FLUORIDE)

PVDF is superior to other valve thermoplastics in chemical resistance and abrasion resistance. It has remarkable strength over the largest working temperature range.
The working temperature range of PVDF valves is -40 to 120°C (-40 to 250°F).
PVDF’s impact strength is over twice that of PVC. The valves are extremely durable under mechanical abuse even at -40°F. They also offer the highest abrasion resistance of thermoplastic valves.
PVDF has excellent chemical resistance against halogens such as chlorine and bromine, strong acids such as hydrofluoric and nitric acids, organic solvents and oils. PVDF is not resistant to hot bases.
It is also non toxic and imparts no odours or tastes into the fluid. Our PVDF conforms with USDA Title 21, P121.2593 requirements for contact with food.
Gas permeability of PVDF is extremely low. A patented PVDF gas permeability barrier is available on Type 14 and DV Series Diaphragm Valves. It is a backing to the Teflon® diaphragm and has proven to increase the life of diaphragm valves on chlorine and strong acid services.

TEFLON® PTFE (POLYTETRAFLUOROETHYLENE)

PTFE is almost totally insoluble and chemically inert. It has high temperature resistance. Teflon® PTFE ball seats, because of natural lubricity, require no lubrication. Teflon® PTFE diaphragms and flange gaskets are used in the most severe chemical resistance applications.

Source:https://www.sukoptfe.com/materials-of-construction-thermoplastics

Polypropylene Lined

Polypropylene is our most economical system. It has good resistance to both inorganic acids and bases.

POLYPROPYLENE HOMOPOLYMER:

Used in 1”-8” Swaged Pipe;Used in 1”-12” fittings;Temperature capability 0º F– 225º;Will exhibit brittle behavior as temperatures approach 0 F (-18 C);Possesses some abrasion resistance.

POLYPROPYLENE COPOLYMER:

Used in 1’-12” Thermalok Pipe;More ductile than homopolymer PP and hence has improved low temperature resistance;Temperature capability -20 º F – 225º;Better abrasion resistance.

TYPICAL INDUSTRIES USING PP:

Water Treatment;Chemical Processing;Food and Beverage;Steel & stainless steel pickling;Power Generation.

COMMON PP APPLICATIONS

Up to 38% HCl;<90%  H2SO4;<30%  HNO3;<60% HF;Sea Water / Brine;NaOH (caustic);Ultrapure Water;Fruit Juices.

Source:https://www.sukoptfe.com/polypropylene-lined

What is Fluoropolymer?

Fluoropolymer is usually olefinic polymer which consists of partially or fully fluorinated olefinic monomers such as vinylidene fluoride (CH2¼CF2) and tetrafluoroethylene (TFE) (CF2¼CF2). These polymers have been covered in great detail in a number of references. More specialty fluorinated polymers include per-fluoroethers, fluoroacrylates, and fluorosilicones which are used in significantly smaller volume than olefinic fluoropolymers.

Commercial fluoropolymers include homopolymers and copolymers. Homopolymers contain 99% or more by weight one monomer and 1% or less by weight of another monomer according to the convention by American Society for Testing Materials (ASTM). Copolymers contain more than 1% or more by weight of one or more comonomers. The major commercial fluoropolymers are based on three monomers:

TFE, vinylidene fluoride (VF2), and to a lesser extent chlorotrifluoroethylene (CTFE). Examples of comonomers include perfluoromethyl vinyl ether (PMVE), perfluoroethyl vinyl ether (PEVE), perfluoropropyl vinyl ether (PPVE), hexafluoropropylene (HFP), CTFE, perfluorobutyl ethylene (PFBE), and exotic monomers such as 2,2-bistri-
fluoromethyl-4,5-difluoro-1,3-dioxole.

A good rule of thumb to remember is that increasing the fluorine content of a polymer molecule increases its chemical and solvent resistance, flame resistance, and photostability; improves its electrical properties such as lower dielectric constant; lowers coefficient of friction; raises melting point; increases its thermal stability; and weakens its mechanical properties. Solubility of polymers in solvents usually decreases by increasing the fluorine content of the molecule.

Fluoropolymer Classification

The serendipitous discovery of PTFE in 1938 by Roy Plunkett of DuPont Company  began the era of fluoropolymers.PTFE has found thousands of applications because of its unique properties. Various fluoroplastics have been developed since the discovery of PTFE. A number of companies produce these plastics around the world. Fluoropolymers are divided into two classes of perfluorinated and partially fluorinated polymers. Perfluorinated fluoropolymers are homopolymers and copolymers of TFE. Some of the comonomers may contain a small amount of elements other than C or F.

Polymer Development History

PTFE cannot be fabricated by melt-processing techniques because of its high viscosity. Melt-processible fluoropolymers have been developed by copolymerization of TFE. FEP, a copolymer of TFE and HFP, has a lower maximum continuous use temperature than PTFE (200 C vs. 260 C) because of the deterioration of mechanical properties. PFA, a copolymer of TFE with PPVE or PEVE, offers thermal stability, melt-processibility and maximum continuous use temperatured 260 C. Both FEP and PFA are considered perfluoropolymers.

Copolymers of ethylene with tetrafluoroethylene (ETFE) and chlorotrifluoroethylene (ECTFE) are mechanically stronger than perfluoropolymers, accompanied with tradeoffs of reduction in their chemical resistance and continuous use temperature and an increase in the coefficient of friction.

Amorphous copolymers of TFE are soluble in special halogenated solvents and can be applied to surfaces as a polymer solution to form thin coatings. The dried coating is as resistant to almost as many chemicals as PTFE.

Source:https://www.sukoptfe.com/what-is-fluoropolymer

Fluoropolymer Tubing Applications Details

FLUOROPOLYMERS ARE SOME OF THE MOST VERSATILE ENGINEERING MATERIALS KNOWN AND, SINCE THEIR DISCOVERY OVER 70 YEARS AGO, HAVE BEEN USED IN NEARLY EVERY FIELD OF MODERN INDUSTRY, TECHNOLOGY, AND SCIENCE......

FLUOROPOLYMER

Fluoropolymers are some of the most versatile engineering materials known and, since their discovery over 70 years ago, have been used in nearly every field of modern industry, technology, and science. Their non-stick proper-ties became commonly recog-nized by the consuming public when E. I. DuPont began marketing his Teflon® brand product for use on cookware, as a fiber treatment for stain resistance, and in other household applications.

Fluoropolymer material is recognized for its excellent resistance to heat — up to 500°F continuously.  Lesser known is its usefulness in extremely cold temperatures.
Fluoropolymer will remain reasonably flexible to -100°F.

Because fluoropolymers are almost universally inert to industrial chemicals and solvents,their use for corrosion protection has become one of their largest growth areas. With few exceptions, fluoropolymer tubing can handle virtually any corrosive chemical inuse today.

FLUOROPOLYMER TUBING

Almost totally inert, Fluoropolymer tubing can be used with virtually all industrial solvents, chemicals, and corrosive materials, even at elevated temperatures. It does, however, react with fluorine, molten sodium hydroxide, and molten alkali metals
Fluoropolymer tubing can be steam or chemically sterilized in-line with any industrial cleaner, solvent, or sterilizing method.
Fluoropolymer’s non-stick property allows transport of viscous, sticky materials without line clogging. It also offers outstanding aging resistance.
PTFE’s translucent white color will vary naturally from lot to lot, however the quality and physical properties do not change. FEP and PFA are clearer and can be heat sealed and heat bonded.  
Permanent color striping, etching, and longer-than-listed lengths are available through minimum order. Polyethylene-jacketed, thin-wall fluoropolymer tubing, for low-cost purity, is also available through minimum order — call for details.

FEATURES OF FLUOROPOLYMER TUBING

■ Chemically inert; low permeability
■ Manufactured from FDA compliant materials for use with food contact surfaces
■ Lowest coefficient of friction of any solid material
■ Excellent electrical and weathering properties; non-flammable
■ Made without plasticizer which can leach into critical streams
■ Ultra-high-purity grades available for the semiconductor industry

FLUOROPOLYMER TUBING APPLICATIONS

■ Adhesives & Hot Glue Delivery ■ Automotive  ■ Cable Bundling ■Chemical Transfer ■ Connector Sleeves  ■ Corrosives ■ Cryogenics  ■Deionized Water Transfer ■ Environmental Sampling  ■ Flame Retardant Covering  ■ Food & Beverage Processing  ■ Internal Sheathing ■ Laboratory & Medical Uses ■ Lighting Covers ■ Paint Spray Systems ■ Petrochemical Transfer ■ Pharmaceutical Processing and Packaging ■ Pure Air Systems ■ Pure Water & Fluid Systems ■Push-Pull Cable Jacketing ■ Robotics  ■ Sight Glass (FEP) ■ Solvent Transfer  ■ Wire Insulation ■ More

IMAGES FOR FLUOROPOLYMER TUBING

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Source:https://www.sukoptfe.com/fluoropolymer-tubing

High Temperature Heat Pipes

High temperature heat pipe technology satisfies demanding requirements in aerospace, chemical processing, annealing, furnace liner isothermality, semiconductor material crystal growth, oil-shale extraction and a wide range of high-tech electronics, heat dissipation and heat uniformity applications.

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For efficient high-temperature (300°C to 2,000°C) heat dissipation, thermal spreading, high-heat flux cooling and other high-temperature heat management challenges, High-temperature heat pipes are the thermal solution of choice.

HIGH TEMP HEAT PIPE MATERIALS AND APPLICATIONS:

High temo pipe materials of construction are typically Alloy for PTFE,Cesium, Potassium, and Sodium. Our also manufactures a Haynes 230/Sodium heat pipe for extended operation near 1100°C because of the significantly higher creep strength. Austenitic stainless steels can be used for applications that are at the lower end of the temperature range.

Typical applications for high temperature heat pipes include the following:

• * Heat Engine Receivers (Steam, Stirling, Brayton, Rankine)
• * Solar Thermal
• * Heat exchangers
• * Hypersonic wing leading edges
• * Waste heat recovery
• * Nuclear power
• * Thermoelectric Generators
• * ​Isothermalizing furnace elements
• 
  

HOW ARE HIGH TEMPERATURE HEAT PIPES USED?

High temperature heat pipes can be used to build custom heat transfer devices for both high power throughput and precise temperature uniformity. Power throughput in the 1 to 100 kW range is typical. Precision heat treating and materials processing furnaces are capable of extraordinarily precise temperature set points and isothermality. Set point accuracy, stability, and isothermality of ± 0.1°C is common with a single heated zone, using an off-the-shelf temperature controller.

Because of the inherent temperature uniformity and stability of high temp heat pipes, they are an integral component in nearly all of the most precise temperature calibration instruments in the primary calibration laboratories around the world. This technology can also be applied to research, commercial, and industrial applications for processes such as annealing, sintering, crystal growing, brazing, and controlled diffusion.

Source:https://www.sukoptfe.com/high-temperature-pipes

PTFE Feature and It’s Types

PTFE (Polytetrafluoroethylene) is a synthetic material composed of tetrafluoroethylene which haves numerous usage. Teflon, Brand name of PTFE is discovered by this compound. 

The evolutionary Polytetrafluoroethylene i.e. PTFE is commonly known as Teflon from a niche product used only in high-value applications to a mainstream requirement has been very gradual. PTFE usage has crossed a critical mass and is commercially viable in more than 200 industrial applications.

PTFE is a synthetic fluropolymers of tetrafluroethylene that has been used in numerous applications. The best brand name of PTFE based formulas is Teflon. PTFE is fluorocarbon solid; it is neither water nor water- containing substances wet PTFE. PTFE has the lowest coefficient of friction against any solid. PTFE is used as a non-stick coating for and many cookware.

PTFE is manufactured in various types such as Rods, Bushes, CFT Thrust Pads, Bellows, Balls, Washers, Rings, Teflon Valve Seats, Gaskets, O Rings, and Strips etc.

FEATURE OF PTFE

• 1. High temperature resistance: It could work stable between 200°C and +260°C.
• 2. Low temperature resistance. It has excellent mechanical toughness in -180°C.
• 3. High lubricating property.
• 4. Excellent insulation property.
• 5. Nice non-sticky property.
• 6. Nonhazardous
• 7. Anti-corrosion.
• 8. Long durabilit
• 
  
• Source:https://www.sukoptfe.com/ptfe-feature-and-its-types

Applications of PTFE Rod

PTFE Rod Features:Usage temperature range is very broad (Celsius from - 200 degrees to +260 degrees); Anti-majority chemical substance's corrosiveness, except some fluorides and alkalinity moltenmetal;Excellent mechanical properties, aging resistance;Excellent flame resistance(Conforms to ASTM-D635 and D470 test step),in the air to be regulated as a flame retardant material;Very low water absorption......

PTFE-polytetrafluoroethylene was discovered by Dr. Roy Plunkett of DuPont Research Laboratory on April 6, 1938. The original PTFE was further developed by Dupont and released as a product in 1945.

The product is highly resistant to chemical corrosion and can handle temperatures above 500 ° C. One of PTFE’s first household items is the “PTFE coated frying pan”. Although the pot works very well, it is different from the PTFE rods and plates we supply. It is sprayed on almost black coating, pure PTFE rods and sheets in the PTFE round bar steam valve package is bright white how to use industrial PTFE plastic rods how to use industrial PTFE plastic rods PTFE gaskets and steam packaging.

Because PTFE has high temperature and chemical resistance, it is usually used for valve applications. From simple steam / hot water valves to high temperature, fluid handling industries caustic chemical valves. This material is semi-rigid to rigid plastic and can be easily machined — one of the easiest to use plastic. The PTFE rod can be machined into very close tolerances on most small diameter rods with a diameter of +.002 “/ — .00”. Chemical resistance is one of the key properties associated with materials. In flakes or flakes, PTFE is used as a gasket material for high heat and chemical resistant flanges and seals.

Source:https://www.sukoptfe.com/applications-of-ptfe-rod

Polypropylene Woven Bags necessity for every industry & individual

There are many benefits of using a Polypropylene (PP) woven bag Manufacturer out of which the most important thing is that they are absolutely environmental friendly and do not cause any health hazards. Therefore you can safely carry or pack food in it without any worries. It does not stain and will not give out colour at all. It is washable too. It is extremely light weight therefore won’t burden you with bag weight. Most PP bags are also waterproof therefore it is the best option during the rainy seasons. They are the most durable and strong cold as well as heat resistant bags in the present day. They are also flame resistant therefore don’t catch fire. These bags allow the things inside to remain fresh too.

Synonyms of PP bags

You might get confused and may take it forever to search for a pp woven bag as many manufacturers sell it under different names and moist don’t even know the name. Therefore you should know how it looks and also the other names by which it is called. The other names for woven polypropylene bags are woven PP sacks, Wpp bags, woven poly bags, woven bags, rice bags, salt bags and the like.

Other uses of PP bags

Woven PP bags are not only good for individual use but are also a very good option for packaging large industrial and agricultural good. You can use Pp bags to transport rice, salt, seeds, flour as well as several other agricultural products. The industrial sector can use these bags to transport or store coal, cement, sand, and the like. Fertilizers, chemicals, firewood can also be stored or carried in it.

Numerous Applications of PTFE Sheet

There are many types of engineering plastics on the market. However, PTFE sheet is the most useful, in all industries have a great application. 

Chemical resistance is another excellent feature of PTFE. It has the power to resist chemical corrosion. Compared with other plastics on the market, it has a high resistance. Although plastic covers common applications and uses, you can not find chemicals that may damage the plastic. PTFE sheet has acid resistance. Since the plastic sheet can easily withstand the acidic reaction of higher concentrations of acid; it can be used in many ways.

High temperature resistant — PTFE sheets also require high temperatures. As the material can easily withstand low temperatures, but also to maintain the same level of performance. No effect on the quality of the material. Even if the temperature exceeds 250 degrees Celsius, this will not affect its performance. It can also resist the temperature, or even down to -260 degrees Celsius level. It is basically used effectively as a liner inside the ship.

Electrical insulation — this is another important feature of PTFE tape. Is considered one of the best materials for electrical insulation. It is also used as an excellent alternative to PVC in an efficient manner.

People can now find the various uses of this kind of equipment. It is used in the food production industry. Its use in the food industry is due to its being truly safe and does not contaminate food particles. Use in food is very safe because it does not have any harmful effects. It is also a product for industrial use to reduce costs. Because it also has super sliding differences, industrialists are more interested in these products. PTFE tubing is also used to achieve successful industrial applications.

Source:https://www.sukoptfe.com/numerous-applications-of-ptfe-sheet

Convoluted Low-Profile PTFE Lined Hose

Polytetrafluoroethylene (PTFE) is an engineered fluoropolymer. Oustanding resistance to chemicals is one of its primary attributes. A broad temperature range of -100°F to 500°F (-73°C to 260°C) make this hose material suitable for the majority of fluid and ambient temperature conditions found in industry.

Rubber convoluted PTFE hoses offer a non-stick, helically-shaped inner core which minimizes pressure drops and simplifies cleaning. These flexible hoses are designed to transport almost all substances and to withstand the most demanding conditions, including high velocity and pressure surges. The standard PTFE inner core can be replaced with an optional black non-conductive liner. All are available in bulk or fabricated assemblies.

FEATURES:

Conductive PTFE Lined Hose with Braided Stainless Steel Cover Features
• Lower convolutions for minimal pressure drop and ease of cleaning
• Inner core is convoluted non-stick PTFE
• Outer cover is stainless steel braid overwrap
• Non-stick contact surface will not contaminate contacted substances
• Not affected by weather and will not age in service within the recommended temperature and pressure ratings
• Withstands high velocity and pressure surges
• Unaffected by continuous flexing or vibration when used in accordance with minimum bend radius specifications
• Autoclavable and steam-cleanable
• Available in bulk or fabricated assemblies

Conductive PTFE Lined Hose with Braided Polypropylene Cover Features
• Inner core is low profile convoluted white PTFE
• Outer cover is bonded with a PTFE fiberglass braid and over braid with a polypropylene monofilament
• Each monofilament strand is twisted for abrasion and chemical-resistance
• Full vacuum rating on all sizes at 70°F
• Will not conduct internal heat as quickly as metallic braided hoses
• Conveys most all substances and withstands the environmental conditions in which it operates
• Available conductive liner for static dissipation
• Ease of cleanability
• Available in bulk or fabricated assemblies

APPLICATIONS

• Food processing
• Pharmaceutical processing
• Cosmetics
• Hot CIP solutions
• Chemical products
• Low pressure steam applications

CONNECTIONS

• Broad variety fittings in 316L Stainless Steel, PTFE encapsulated or non-metallic materials
• Electropolished Stainless Steel fittings available
• Crimped fittings available in other high quality alloys
• Available with etched date or purchase order number on crimp collars

Source:https://www.sukoptfe.com/convoluted-low-profile-ptfe-lined-hose

Chemical Applications of PTFE

PTFE is utilized broadly as a part of a wide range of commercial ventures:

Petrochemical and chemical processing: PTFE is the material of decision for gaskets, vessel linings, pump insides, washers, rings, seals, spacers, plunge tubes and well-boring parts in light of the fact that it is erosion safe and artificially dormant; it is unaffected by practically all acids and caustics and capacities in situations to 500 degrees F.

Electrical applications: PTFE is one of the best separators known. In slender segments, it will protect to 500 volts for each mil. There are evaluations of PTFE which have significantly more prominent dielectric quality. It is regularly utilized as a part of the wire and link wrap, and to discrete conductive surfaces in capacitors. Thick walled close-resistance expelled tubing is the PTFE state of decision where machining or penetrating, long lengths to close tolerances is unthinkable. Multi-gap tubing can be expelled. PTFE can be machined into standoff protectors, and a wide range of sorts, of high voltage epitome gadgets for electrical segments. PTFE bush manufacturer India provides the best products.

Semiconductor Industry: PTFE is dormant, and its working temperature, extent is from less 350 degrees Fahrenheit to 550 degrees Fahrenheit. At the point when made to ultra immaculate norms, it is the material of decision for different things utilized as a part of chip assembling, including embodiment gadgets for quartz warmers, and so forth.

Nourishment, Beverage and Pharmaceutical commercial enterprises: Virgin PTFE is endorsed by the Food and Drug Administration for use in the sustenance, refreshment, beautifiers and pharmaceutical businesses. Slender Film and sheets make an ideal, no-harmful side surface without infinitesimal sorrows where microorganisms can develop. Conveyancing segments — profiles, aide rails and slides — can withstand high temperatures inside preparing and drying stoves and other warmed portions of the sustenance, beautifiers or pharmaceuticals assembling procedures.

Lab applications: PTFE channeling, tubing and vessels are utilized as a part of the different lab product in view of their concoction resistance, and dormancy. No contaminants hold fast to the surface.

Bearing pads: Glass filled PTFE can cut or stamped into bearing cushions, and will oppose all climate related corruption while remaining an ideal interface between dissimilar development materials, similar to steel and cement.

PTFE Compounds: Various fillers can be mixed with the PTFE base sap to improve certain properties, e.g. glass fiber, glass dabs, carbon, graphite, molybdenum disulfide, bronze, and so forth.

UHMW Polyethylene Film

UHMW Polyethylene Film has extremely high abrasion resistance, exceeding the abrasion resistance of steel. Coupled with broad chemical resistance and low coefficient of friction makes UHMW an extremely versatile engineering material for many severe service applications. Slippery like Teflon® Fluoropolymer, but super abrasion & wear resistant. UHMW Polymers have a molecular weight average 10 times that of conventional high density polyethylene resins. Higher molecular weight gives UHMW Polymers its unique combination of characteristics Applications: Inner and outer surfaces for potable water, chemical, fuel and hydraulic hoses, bottom surfaces for skis and snow boards, linings for chutes to decrease friction and wear.

Features of UHMW Film

The highest abrasion resistance of any thermoplastic polymer
Outstanding impact strength even at very low temperatures
An excellent sliding material due to the low coefficient of friction
Self-lubricating (non-caking and sticking)
Sound dampening properties
Good chemical and stress cracking resistance
Easily machined
FDA and USDA approved

UHMW has a very low coefficient of friction and is used in sliding bearing applications where load and temperature are not high. We find that UHMW is used in belting as a structural support layer, and also in automotive rubber profiles as a wear and friction reducing layer.

Why Choose PTFE lined hose?

What is PTFE? Polytetrafluoroetheylene is the specific chemical name for Teflon. PFTE is a special product to make industrial hosing from as it does not breakdown with exposure to corrosive acids, even when hot. It does not dissolve due to solvent exposure; does not become fragile and breakable when exposed to extreme cold (ex: -240 degrees Celsius).

What sets PTFE lined hose with stainless steel reinforcement apart from other types of industrial hoses?

Outstanding performance under severe application conditions.
More economical choice than traditional products when total lifecycle-cost is considered.
PTFE lined hoses will outlast an ordinary rubber or thermoplastic hose under virtually any operating condition.

Durability and Flexibility of PTFE Lined Hose

PTFE lined hoses have longer-lifecycles.
Excellent for various chemicals at higher temperatures, within a wide range of pressure, without breaking down – please see our chemical matrix and product specification information for compatibility.

Higher temperatures:  Rated from  -100° F to 500°F.
Higher pressures from 500psi to 3500psi.

PTFE lined hose is very flexible and well suited for continuous processes involving motion & vibration.

Source:https://www.sukoptfe.com/why-choose-ptfe-lined-hose

What is PTFE?(Polytetrafluoroethylene)

Polytetrafluoroethylene (PTFE) is a synthetic material accidentally invented in the late 1930s while a chemist was endeavoring to develop a new type of perfluorethylene-based refrigerant. Rather than achieving a chlorofluorocarbon, the scientist was surprised to find that the perfluorethylene used in the process reacted with the iron content of its container and polymerized under pressure. Less than a decade later, this new material was being distributed on a commercial scale and was eventually patented under the name Teflon®. It would be another 20 years before this material would hit the frying pan and become known as the first non-stick coating for cookware, however. In fact, this material was used for a variety of other purposes at first.

During World War II, PTFE was used to prevent the escape of radioactive materials from the facility designated to produce the first atomic bomb in the U.S., an objective dubbed as the Manhattan Project. This facility represented an impressive piece of real estate with more 2,000,000 square feet (609,600 sq. meters) in which to house uranium hexafluoride. Not only is this substance highly toxic and corrosive in its own right, but it also forms a dangerous gas known as hydrogen fluoride in the presence of water or water vapor. For this reason, PTFE was used as a coating for pipefittings to make them leak proof.

The exceptional insulating properties of this material made its use in electronic components ideal. For one thing, it is non-conductive, making it resistant to high electric fields. It is also highly resistant to water, heat, and chemical corrosion. In fact, it continues to be used to produce laboratory equipment and accessories that come into contact with hydrofluoric acid, which would otherwise dissolve other materials, even glass.

PTFE also possesses very low frictional properties, which is expressed as frictional coefficient. This measurement is relative and differs according to the materials brought into contact to generate or simulate friction. In terms of plastics, friction is usually observed against polished steel. To put the low friction coefficient of PTFE into proper perspective, it is the only known synthetic surface material to which the toe pads of a gecko fail to stick. This quality makes it suitable for manufacturing parts that need to resist friction, such as gears and ball bearings.

This material was eventually introduced to American households by Marion Trozzolo, founder of Laboratory Plasticware Fabricators. While Trozzolo had been producing Teflon®-coated scientific tools for a number of years, he became inspired by a French engineer who found it such an effective non-stick coating for his fishing gear that he later treated his wife’s pots and pans with it. While this experiment led to the production of cookware known as Tefal (T-Fal®) in France in the mid-1950s, Trozzolo became the first U.S. producer of Teflon®-coated cookware. In fact, "The Happy Pan," launched in 1961, earned a place of historical significance in the Smithsonian Institute and Trozzolo a name of distinction in the Plastics Hall of Fame.

Source:https://www.sukoptfe.com/what-is-ptfe-sukoptfe

Teflon® PTFE Sheet Applications and Images Show

PTFE sheets are slippery shiny white materials. The characteristic features of PTFE sheets determine its uses. The following are some of the applications of PTFE sheets:

1. PTFE sheets are a multifunctional material mainly used in sublimation and/or heat press industry. Its non-sticky feature makes it important in this industry. Its function is used to prevent ink from staining the platen parts of the heat press machine, thus eliminating the chances of scorching the product and keeps the heat transfers from sticking to the platen. Moreover, PTFE sheet is used to prevent ghosting effect during sublimation process created when the paper slides across the shirt when the platen is being lifted. It can also be used as a weight to keep the transfer paper in its place to ensure good results. PTFE sheets are reusable and can last up to a maximum of 200 presses, hence PTFE sheets can last for long time.
2. It is used in beverage, food, and pharmaceutical industries. PTFE sheets have been approved by Food and Drug organization for use in this industry. This is because the thin film sheets are inert and non-toxic, hence when used to cover food, it cannot react. In addition, it withstands high temperatures. Therefore, PTFE sheet has the ability to conserve the warmth and maintain the temperature of the covered food for a long time.
3. PTFE sheets are excellent electrical resistant, making it suitable for applications in the electrical industry. They are used to provide electrical insulation where it can insulate up to 500 volts per mil. It is frequently used to wrap electrical wires and cable. Moreover, it is used to separate conductive plates in capacitors.
4. PTFE sheets are used in petrochemical and chemical industries. It is used to make vessel linings, gaskets, rings, pump interiors, dip tubes, washers, seals, spacers, chemical tanks, etc. This is because PTFE sheets are chemically inert, melts at high temperatures and resistant to corrosion. This makes them unaffected by caustics or acids, and it can be used in high temperature environment of up to 500 degrees Celsius.
5. In addition, the inert and chemical resistance nature of PTFE sheets makes it suitable for laboratory applications. Therefore, it is used to make the lining of special pipes, tubes, glasses, vessels and lab counter tops.

IMAGES FOR PTFE SHEETS

Source:https://www.sukoptfe.com/ptfe-sheet-applications-and-images-show

Why Use PTFE Convoluted Hose?

PTFE hose is ideally suited for applications requiring maximum flexibility, high-pressure ratings, chemical and temperature resistance, and extremely long life. PTFE hose offers the following advantages:

Flexible–The flexibility of PTFE hose provides excellent resistance to failure in fatigue and flexing applications.

Chemical Resistant–PTFE is inert, thus creating a nearly “universal” hose capable of handling the broadest range of applications.

Temperature Resistant–It even handles steam–up to +388°F.

Non-Stick–PTFE hose is easily cleaned to maintain batch purity when using one hose for several services.

Low Friction–PTFE hose exhibits low-pressure drop that remains constant because no deposits accumulate on the inside wall of the hose.

Moisture Resistant–Ideal for pneumatic systems requiring low dew point.

Non-Aging–Properties of PTFE hose do not change with age or exposure to weather.

EXAMPLE OF PTFE APPLICATIONS

Molding–PTFE hose handles steam up to 388°F @ 200 psi steam pressure for heating of plastic and rubber molding presses.

Urethane Foam Manufacturing–PTFE hose handles isocynates and other activators at the high pressures in foam manufacturing processes.

Gas Transfer/Breathing Apparatus–PTFE hose exhibits low permeability to 02, N 2, & Argon under high pressure.

Marine Hydraulic Control & Power Systems–PTFE hose is resistant to fire resistant and water emulsion hydraulic fluids used in marine systems.

Steam Applications–PTFE hose is ideal for use on heating lines on dryers in processing plants and as lines that provide steam to laundry garment presses.

Fuel Lines–PTFE, when used as a fuel hose, is resistant to the blending of additives in fuels. 

Compressor Discharge Hose–With most compressor discharge applications operating above 300°F, PTFE hose is the obvious choice over rubber hose. Less carbon particles deposit on PTFE due to its inherent release properties.

Chemical Handling–PTFE hose solves chemical handling problems – whether its low permeability or low buildup–in leading stations, on flexible connections between chemical pipework, and in laboratories.

Adhesives–PTFE hose handles the adhesives that are present in shoe manufacturing, canning operations, and carbon manufacturing.

WHY USE PTFE CONVOLUTED HOSE?

• Increased flexibility
• Tighter bend radius:

​

• Operating temperature -65°F (-54°C) to +400°F (+204°C)
• Available in a wide size range (-8 to -32) when compared to smooth-bore hose.
• Spun polyester hose with advanced abrasion resistance is available.
• Conductive tube to dissipate electric charge buildup is available

Source:https://www.sukoptfe.com/why-use-ptfe-convoluted-hose

Polytetrafluoroethylene - PTFE

PolyTetraFluoroEthylene is a fluorocarbon-based polymer and is commonly abbreviated PTFE. Several other manufacturers make their own brands of PTFE which can often be used as substitute materials. This fluoroplastic family offers high chemical resistance, low and high temperature capability, resistance to weathering, low friction, electrical and thermal insulation, and "slipperiness". ( see also Teflon® PTFE and Teflon® FEP & PFA Specifications ) PTFE's mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of of -100°F to +400°F (-73°C to 204°C). Mechanical properties are often enhanced by adding fillers (see paragraph below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and cannot be melt processed -- it must be compressed and sintered to form useful shapes.

PTFE's mechanical properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze. Generally, filled PTFE's maintain their excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability, and wear resistance. The properties of 25% glass-filled and 25% carbon-filled PTFE grades are shown below for comparison purposes. There are literally dozens of different filled PTFE products and grades -- too many to be listed here. 

TYPICAL PROPERTIES of PTFE

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets . All values at 73°F (23°C) unless otherwise noted.

Source:https://www.sukoptfe.com/about-polytetrafluoroethylene-ptfe-details

PTFE Tube Properties

The Steel Industry and Chemical Processing Industry have been using fluoropolymer tubing products from materials like PTFE and hoses for many years for transferring highly caustic or corrosive chemicals. More and more, PTFE tube is replacing carbon and other metal piping that deteriorates rapidly. Now and for the future, PTFE will continue to serve the industry in critical applications.

THERMAL QUALITIES:

PTFE tubing can withstand temperatures up to 680 °F for limited periods of time.* Under cryogenic conditions, PTFE remains strong down to -320 °F.

*Above 500 °F, mechanical properties become a limiting factor

ELECTRICAL QUALITIES:

PTFE tubing has superb electrical properties, indicated by a low dielectric constant of 2.1 between -40 °F and 480 °F within a frequency range of 5 Hz to 10 GHz.

PTFE tubing is also an excellent insulator with surface resistivity of 3.6 X 1012 ohms (even at 100% relative humidity).

Short time dielectric strengths range from 500 volts/mil (1 mil = 10-3 in) for thicknesses greater than 100 mils to 4000 volts/mil for very thin films.

UV AND RADIATION QUALITIES:

PTFE tubing has excellent UV resistance and weatherability, with a radiation dose threshold for PTFE at 2 – 7 X 104 rads. Absence of oxygen increases radiation resistance by a factor of at least 10.
*Resistance to electron and gamma radiation is relatively poor

WEAR AND FRICTION QUALITIES:

PTFE tubing has a relatively slippery and smooth surface, with a static coefficient of friction of 0.08 and 500 psi load.

The PTFE properties make it particularly suitable for use as bearing pads, under high pressure-low velocity load conditions. Examples are bridge bearing pads, pipe support pads, and mounting pads for heavy manufacturing.

Source:https://www.sukoptfe.com/ptfe-tube-properties

PTFE Hose

PTFE unique properties:

- Excellent chemical resistance. It does not dissolve or swell in any of known solvents. It is resistant to highly aggressive acids and bases. Only very few, very rare substances (fluorine, boiling alkali metals, oxygen bifluoride, chlorine trifluoride) can affect PTFE.
- Wide range of thermal resistance. PTFE remains flexible even at the temperature of liquid helium (-269°C).
Crystalline melting point of PTFE is +327°C, and at +415°C decomposition of PTFE takes place. Working temperature for hoses made of PTFE usually ranges from -70°C up to +260°C depending on the hose design (pressure and mechanical parameters of PTFE start to decrease when the temperature rises above +130°C).
- Resistance to ageing and weather conditions. PTFE is hydrophobic, entirely resistant to ozone, oxygen, light and UV radiation. Samples exposed for several dozen of years to diverse climate conditions have not shown any changes to PTFE properties.
- PTFE has a very low coefficient of friction (from 0.02 to 0.2) and a low value of surface energy. Therefore hoses made of PTFE have self-cleaning properties (substances do not stick to hose walls) so the transfer is very hygienic.
- Good electrical properties, high resistivity.
- Self-extinguishing properties.
- Moderate resistance to abrasion.

Other materials similar to PTFE

Hoses can be manufactured not only from PTFE but also from PTFE copolymers. They usually feature high chemical and thermal resistance but other properties are slightly different in comparison to PTFE (better mechanical resistance, better processing qualities):

- FEP (teflon FEP, DuPont),
- PFA, MFA (teflon PFA, DuPont),
- ETFE (Tefzel, DuPont),
- ECTFE (Halar).

Production and construction of PTFE hoses

Because of high viscosity even at temperatures close to thermal decomposition (+415°C), PTFE hoses are manufactured by extruding the compound of lubricant (paraffin oil) and PTFE powder.

Types of PTFE hose construction:

- Smooth and corrugated hoses with no braid. Used for low pressure applications. Translucent, PTFE wall allows the visual control of the flow.
- Smooth hoses with a single or double external braid made of stainless steel. Widely used for almost all media: chemicals, gases, steam, oils, lubricants, fuel, paint, adhesives, foodstuffs in all branches of industry. The combination of relatively high working pressure of the hoses (up to around 400 bar) and PTFE unique properties
result in a universal and irreplaceable solution for recent industrial technology.
- Corrugated hoses with external braids made of stainless steel or different materials. Sometimes reinforced with a steel wire helix between PTFE and the external braid. Manufactured in various construction options with lower working pressure but higher flexibility than smooth bore hoses.
- Smooth bore hoses with an extruded PTFE liner with a textile braid, steel wire helix reinforcement and an external layer made of rubber. All layers are vulcanized and permanently integrated with the PTFE internal layer - as in a standard rubber hose. Used mainly in chemical industry.

Applications of PTFE

PETROCHEMICAL AND CHEMICAL PROCESSING

PTFE is the material of choice for gaskets, vessel linings, pump interiors, washers, rings, seals, spacers, dip tubes and well-drilling components because it is corrosion resistant and chemically inert; it is unaffected by virtually all acids and caustics and functions in environments to 500 degrees F.

ELECTRICAL APPLICATIONS

PTFE is one of the best insulators known. In thin sections, it will insulate to 500 volts per mil. There are grades of PTFE which have even greater dielectric strength. It is frequently used in wire and cable wrap, and to separate conductive surfaces in capacitors. Thick walled close-tolerance extruded tubing is the PTFE shape of choice where machining or drilling long lengths to close tolerances is impossible. Multi-hole tubing can be extruded. PTFE can be machined into standoff insulators, and many different types of high voltage encapsulation devices for electrical components.

SEMI-CONDUCTOR INDUSTRY

PTFE is inert, and its operating temperature range is from minus 350 degrees Fahrenheit to 550 degrees Fahrenheit. When made to ultra pure standards it is the material of choice for various items used in chip manufacturing, including encapsulation devices for quartz heaters, and the like.

FOOD, BEVERAGE AND PHARMACEUTICAL INDUSTRIES

Virgin PTFE is approved by the Food and Drug Administration for use in the food, beverage, cosmetics and pharmaceutical industries. Thin Film and sheets make an inert, no-toxic slide surface without microscopic depressions where microbes can grow. Conveyancing components - profiles, guide rails and slides - can withstand high temperatures inside baking and drying ovens and other heated segments of the food, cosmetics or pharmaceuticals manufacturing processes.

LABORATORY APPLICATIONS

PTFE tubing,piping and vessels are used in various laboratory ware because of their chemical resistance, and inertness. No contaminants adhere to the surface.

BEARING PADS

Glass filled PTFE can be cut or stamped into bearing pads, and will resist all weather-related degradation while remaining an inert interface between disparate construction materials, like steel and concrete.

PTFE COMPOUNDS

Various fillers can be blended with the PTFE base resin to enhance certain properties, e.g. glass fiber, glass bead, carbon, graphite, molybdenum disulfide, bronze, etc.

Source:https://www.sukoptfe.com/applications-of-ptfe

PTFE Properties

PTFE has excellent properties such as chemical inertness,heat resistance (both high and low), electrical insulation properties, low coefficient of friction (static 0.08 and dynamic 0.01), and nonstick property over a wide temperature range (260 to þ260 C). It has a density in the range of 2.1e2.3 g/cm3 and melt viscosity in the range of 1e10 GPa persecond. Molecular weight of PTFE cannot be measured by standard methods. Instead, an indirect approach is used to judge molecular weight. Standard specific gravity (SSG) is the specific gravity of a chip prepared according to a standardized procedure. The underlying principle is that lower molecular weight PTFE crystallizes more extensively, thus yielding higher SSG values.

PTFE that has not been previously melted has a crystallinity of 92e98%, indicating a linear and nonbranched molecular structure. Upon reaching 342 C, it melts changing from a chalky white color into a transparent amorphous gel. The second melting point of PTFE is 327 C because it never recrystallizes to the same extent as prior to its first melting.

First-order and second-order transitions have been reported for PTFE. The transitions that are close to room temperature are of practical interest because of impact on processing of the material. Below 19 C the crystalline system of PTFE is a nearly perfect triclinic. Above 19 C, the unit cell changes to hexagonal. In the range of 19e30 C, the chain segments become increasing disorderly and the preferred crystallographic direction disappears, resulting in a large expansion in the specific volume of PTFE (1.8%) which must be considered in measuring the dimensions of Marticles made from these plastics.

PTFE is by far the most chemically resistant polymer among thermoplastics. The exceptions include molten alkali metals, gaseous fluorine at high temperatures and pressures, and few organic halogenated compounds such as chlorine trifluoride (ClF3) and oxygen difluoride (OF2). A few other chemicals have been reported to attack PTFE at or near its upper service temperature. PTFE reacts with 80% sodium or potassium hydroxide and some strong Lewis bases including metal hydrides.

Mechanical properties of PTFE are generally inferior to engineering plastics at the room temperature. Compounding with fillers has been the strategy to overcome this shortage. PTFE has useful mechanical properties in its use temperature range.

PTFE has excellent electrical properties such as high insulation resistance, low dielectric constant (2.1), and low dissipation factor. Dielectric constant and dissipation factor remain virtually unchanged in the range of 40 to 250 C and 5 Hz to 10 GHz. Dielectric breakdown strength (short term) is 47 kV/mm for a 0.25-mm-thick film. Dielectric breakdown strength is enhanced with decrease in voids in PTFE, which is affected by the fabrication process.
PTFE is attacked by radiation, and degradation in air begins at a dose of 0.02 Mrad.

Source:https://www.sukoptfe.com/polymer-properties-of-ptfe

Teflon PTFE Tubing Production Show (Dia 20mm-150mm)

PTFE Teflon Tube/Pipe,Rod,Sheet,Film,Seals,Parts...Supplier & Manufacturer - http://www.sukoplastic.com

Vertical Ram Extruder for PTFE tube;Ram extruding machine for PTFE tube;Using for Pre-sintering PTFE material;Suit for new PTFE material or Recycle PTFE material;Rangeof diameter PTFE Extrusion 20-150 mm, Heating zones 5 zones; Automatic.

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