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PTFE (raw material)


PTFE-4 – is unique thermoplastic polymer having valuable physical and chemical properties determined by especially strong bond of carbon and fluorine atoms. Thanks to that PTFE-4 products have high thermal resistance, exceptional resistance to chemical action, perfect dielectric, mechanical, anti-adhesion and antifriction properties, and also have unique ability to preserve these characteristics even at high working pressure and within wide temperature range (from -269°C to +260°C). Meanwhile at overrun of these parameters just a slight reduction of physical and chemical properties of PTFE-4 products happens, and not the full loss of their chemical resistance.

Comparative characteristics of PTFE-4 various grades:

Quality parameter

PTFE grade






Easily balling up powder, white color, without visible impurities

Mass share of water, %, not exceeding





Density, g/cm3, not exceeding

2,18-2,21 (depending on grade)




Breaking strength of unhardened sample, MPa (kgf/cm2), not less

26 (260) – 15 (150) (depending on grade)

25 (255)

25 (255)

25 (255)

Relative elongation at break of unhardened sample, %, not less

350 – 150 (depending on grade)




Electric strength, kW/mm, not less

50 – 60 (depending on grade)




Average particle size, µm

100-180 (not normed)





At present over 60% of all PTFE production take the traditional PTFE, while the rest 40% is for PTFE based compositions. But still clean PTFE-4 offers good competition to many materials, including metal (stainless steel and enamels).

If it is necessary to increase technical and operational properties of PTFE-4, following composite materials may be added:

  • powder-like;
  • organic: soot, coke, coal, graphite;
  • mineral: sitall, glass fiber, quartz, mica, ceramics, kaolin;
  • metallic: silver, nickel, lead, copper, tin, bronze, aluminium;
  • reinforcing (fibrous);
  • woven: graphite, basalt, asbestos and glass fabrics;
  • non-woven: quartz, graphite, asbestos, basalt and glass fiber, metallic whiskers;
  • skeleton: wrinkled foil, metallic wrinkled net.

Production of PTFE-4 products is based on cold pressing and baking methods.

Depending on average particle size PTFE-4 could be of several grades:

  • F-4: particle size 100 – 180 µm;
  • F-4 PN-90: particle size 46 – 135 µm;
  • F-4 PN-40: particle size 21 – 45 µm;
  • F-4 PN-20: particle size 6 – 20 µm.

PTFE-4 has the following number of unique and indisputable advantages, among which it is possible to emphasize:

  • very low friction coefficient;
  • high resistance to radiation;
  • excellent chemical resistance;
  • electric insulation opportunities;
  • good antifriction parameters;
  • low heat conductivity;
  • absolute incombustibility and very low smoke generation;
  • frost resistance;
  • resistance to aggressive environment action;
  • absence of ageing and photoageing;
  • absolute hydrophobicity;
  • non-brittleness.

As disadvantages of PTFE-4 may be classified:

  • cold flow;
  • high abrasion degree;
  • high temperature linear expansion coefficient;
  • disposition to recrystallization and residual deformation;
  • impossibility to obtain products by casting.

In practice all advantages and disadvantages of PTFE-4 mean the following:

  1. PTFE-4 bearings while working at high speed will abrade very quickly, but at speed to 0,66 m/min, due to excellent friction coefficient, they will serve much longer than steel bearings;
  2. Usage of friction parts under load significantly reduces friction force, while PTFE-4 do not require additional application of lubricating materials; PTFE-4 products, due to frost resistance, may be used at negative temperatures. But meanwhile it is not recommended to use them at temperature lower -800С if they bear load over 30 kg/cm3;
  3. PTFE-4 is indispensable in high-frequency and ultrahigh-frequency technologies, as it has excellent dielectric properties not depending on temperature, current and its frequency; when heating PTFE-4 to +3270С its crystallites began to melt, but the PTFE itself does not transit to viscous flow state.

Distinctive characteristics and positive properties of PTFE-4 permit to use this material in many spheres of industry:

  • in machine-building it is used to make various instruments and parts working without lubrication or with minimal lubrication;
  • in chemical industry it is used to make vessels for storage and transportation of aggressive liquids;
  • in electrical engineering it is used to make electric insulation products; in food industry it is used to produce non-stick and anti-adhesion elements for process equipment;
  • in pharmaceutics and medicine PTFE-4 is used for production of prosthesis holders, cardiac valves, vessels for artificial blood circulation apparatuses, etc.

Polymer Company offers high-quality PTFE-4, application of which permits to create products with unique properties.


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