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PTFE

 

PROPERTIES

APPLICATIONS

  • Outstanding chemical resistance
  • Physiologically inert (virgin grades)
  • Suitable for food contact (virgin grades)
  • Superb electrical insulating properties
  • Wide working temperature range (-260oC to +260oC)
  • Very low coefficient of friction
  • High thermal stability
  • Low flammability
  • High resistance to weathering
  • Low water absorption
  • Gaskets
  • Bushes
  • Slide bearings
  • Dough rollers
  • Insulators
  • Electrical sleeving
  • Valve stem seals
  • Valve seats
  • Extrusion nozzles
  • Chute liners
  • O-rings
  • Pipe lining
   

Polytetrafluoroethylene (P.T.F.E.) is a truly unique material and is still the most widely used of all the fluropolymers.

Unfortunately virgin P.T.F.E. exhibits high elastic deformation under load which considerably reduces its value as a bearing surface. This situation is dramatically improved by the use of fillers. Filled grades of P.T.F.E. are often used for more demanding applications, however only virgin material is suitable for direct contact with food.

P.T.F.E. can be machined using conventional tools, however close tolerance work may prove difficult to achieve particularly when machining components with thin sections.

Please note smoking during any machining process should be prohibited.

Virgin PTFE datasheet
 
Properties Method Unit Typical Values (from-to)
Specific gravity ASTM D792 - 2,14 - 2,20
Tensile strength ASTM D1457 N/mm2 20 - 35
Elongation at break ASTM D1457 % 210 - 400
Compressive strength 1% deformation ASTM D695 N/mm2 4,00 - 4,50
Deformation under load 14 N/mm2 for 24hrs ASTM D621(1) % 10 - 15
Flexural strength 0,7 N/mm2 ASTM D790 N/mm2 no break
Impact strength (Izod) 57°C ASTM D256 J/cm 1,10
Impact strength (Izod) 23°C ASTM D256 J/cm 1,60
Impact strength (Izod) 77°C ASTM D256 J/cm 3,30
Hardness ASTM D2240 (shoreD) 50 - 60
Friction coefficient - static ASTM D3028 (2) - 0,09
Friction coefficient - dynamic ASTM D3028 (2) - 0,05
PTFE - steel oil lubricated - - 0,02 - 0,06
Working temperature range - °C -200 / +260
Increase in volume from room temperature to molten state (340°C) - % 27 - 28
Coefficient of thermal expansion from 25 to 100°C ASTM E831 °C-1 16 x 1-5
Thermal conductivity ASTM D2214 W/mK 0,20
Specific heat 0°C - KJ/kg.K 0,96
Specific heat 50°C - KJ/kg.K 1,05
Temperature of distortion 0,46 N/mm2 ASTM D648 °C 130 - 140
Temperature of distortion 1,85 N/mm2 ASTM D648 °C 50 - 60
Dielectric strength (short-time air thickness 0,5 mm) ASTM D149 kV/mm 55
Dielectric constant ASTM D150 - 2,10
Dissipation factor ASTM D150 - <0,0002
Volume resistivity ASTM D257 Ohm/cm 10-17
Surface resistivity ASTM D257 Ohm 10-15
Arc-resistance ASTM D495 sec OK (4)
Water absorption ASTM D570 % <0,01
Flammability ATB ASTM D635 sec <5,00
Flammability AEB ASTM D635 mm <5,00

Note:
All the values refer to the temperature of 23°C unless otherwise specified
(1) Superseded standard
(2) Speed 5 m/min; load 1kg/cm2, sliding surface steel roughness Ra = 0,4 " 0,6 micron
(3) 100% relative humidity
(4) Without defects

Moulded Virgin P.T.F.E.

  • Rod: 20mm to 505mm Ř

  • Tube: 51mm O/D x 13mm I/D to 205mm O/D x 180mm I/D

  • Sheet: 4mm to 75mm

Moulded 25% Glass filled P.T.F.E.

  • Rod: 20mm to 315mm Ř

Skived Virgin P.T.F.E.

  • Sheet: 0.5mm to 3.0mm

  • Film: 0.05mm to 0.8mm (May be subject to minimum order quantities)

Extruded Virgin P.T.F.E.

  • Rod: 3mm to120mm Ř

  • Tube: 10mm O/D x 6mm I/D to120mm O/D x 80mm I/D

Extruded 25% Glass filled P.T.F.E.

  • Rod: 6mm to 50mm Ř

Extruded 25% Carbon filled P.T.F.E.

  • Rod: 10mm to 50mm Ř

Tubing coils

  • Thin wall tubing (metric)

  • Thin wall tubing (imperial)

  • Electrical sleeving super thin wall

  • Electrical sleeving thin wall

  • Electrical sleeving heavy wall

A list of the most common Sizes etc that are readily available as standard items can be down loaded here

 

The information given here is believed to be correct, but completeness and accuracy are not guaranteed. The user shall be fully responsible for determining the suitability of products for the intended use.