Plastics, Engineering PlasticsPTFE Bar

One of the most commonly used and important fluoropolymer materials.

PTFE is useful in a wide variety of applications. It is a commonly preferred material for sliding applications, and especially in environments that will expose the part to chemical stress.

Products made with PTFE have exceptional resistance to high and low temperatures, chemical reaction, corrosion, and stress-cracking. The electrical and low-friction properties of PTFE make it the preferred plastic for a host of applications. Due to its structure, PTFE is often formed into semi finished products using a compression process and then machined with cutting/machining tools.

Owing to its low friction, PTFE is used for applications where sliding action of parts is needed. In low friction applications, it performs significantly better than nylon and acetal; it is comparable to ultra-high-molecular-weight polyethylene (UHMWPE), although UHMWPE is more resistant to wear than PTFE.

PTFE is the most chemically resistant plastic known. Only a few chemicals react with it. Its mechanical properties are low compared to other engineering plastics, but its properties remain at a useful level over a greater temperature range, from-240°C to 260°C. PTFE has excellent thermal and electrical insulation properties. And, it has a low coefficient of friction. It is difficult to make anything adhere to PTFE. Without proper preparation, a material may stick to it, but the material can be peeled off or rubbed off.

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Range

Product FormSize Range
Round Bar4.0mm - 90.0mm
If you do not see what you are looking for, please contact your local service centre with your specific requirements.

Properties

Properties are for natural bar.

PropertyParameterValueNorm
Mechanical Properties
Tensile Strength22 MPaASTM D 4894
Elongation at Break220%ASTM D 4894
Compression Strength1% Deformation5 MPaASTM D 695
Shore HardnessShore D55ASTM D 2240
Thermal Properties
Glass Transition Temperature-20oCDIN 53765
Service TemperatureShort Term260oC
Service TemperatureLong Term260oC
Thermal Expansion (CLTE)25-100oC Long12 10-5 K-1ASTM D 696
Thermal Conductivity0.20 W/(K*m)ASTM C 177
Electrical Properties
Specific Surface Resistance1016 ohmASTM D 257
Specific Volume Resistance1017 ohm*cmASTM D 257
Dielectric StrengthIn air, Thickness 0.125mm80 kV/mmASTM D 149
Dielectric Constant50-109 Hz2.1ASTM D 150
Other Properties
Water Absorption23oC< 0.01%ASTM D 570
Flammability (UL94)Corresponding toV0DIN IEC 60695-11-10

Applications

PTFE is often used in the following industries: Aerospace, chemical, food technology, cryogenic engineering, mechanical engineering & semicinductor technology.

  • Gaskets
  • Chute linings
  • Insulators
  • Valve seats
  • “O” rings
  • Sliding applications under high chemical stress

Characteristics

  • Extremely high chemical resistance
  • Very good temperature resistance (-200+260°C, short-term up to 300°C)
  • Very low coefficient of friction
  • Extremely low surface tension (practically no materials stick to PTFE, difficult to adhere to or weld)
  • High coefficient of thermal expansion
  • Relatively low strength/rigidity
  • Low dielectric constant
  • Flame resistance
  • Food approved & non toxic

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