PTFE - Polytetrafluorethylene

Virtually chemically inert

PTFE, together with the other fluorine-containing plastics, forms a specific group within the high-performance plastics group. This group offers excellent chemical resistance and a low coefficient of friction over a wide temperature range.

PTFE is resistant to almost all chemicals, is flame-retardant, easy to sterilise, has excellent UV resistance and remarkable non-stick properties. The intrinsic purity of the material makes PTFE suitable for direct food contact. The wear and compression resistance can be greatly improved by inlcuding additives such as bronze, graphite or glass fibres. 

PTFE ToepassingPTFE Toepassing

PTFE in our webshop

Unique features

  • Virtually chemically inert
  • Hardly any adhesion
  • No moisture absorption
  • Low coefficient of friction
  • Non-flammable
  • Food-safe

Applications

  • Covers and liners
  • Heavy chemical applications
  • Bearing material
  • Food industry
  • Seals

Machining options

  • Water jet cutting
  • Laser cutting
  • Welding
  • Gluing
  • Warm bending
  • Cold bending
  • Thermoforming
  • Yes
  • Not in all cases
  • No

How to identify PTFE

To identify PTFE take a small sample and drop it in water; it will sink.  The set it alight and it will burn without dripping or a flame and give off a smell like burnt hair.

What are the main properties of PTFE?

tbc

Technical information

  • General
    Definition Norm Unit Value
    Density ISO 1183 g/cm³ 2.16
    Moisture absorption in normal climate - % 0.01
    Fire rating DIN 4102 - B 1
    Specific heat capacity - kj/Kg°C 1
  • Mechanical
    Definition Norm Unit Value
    Tensile strength DIN 53455 N/mm 30
    Elongation to break DIN 53455 250
    E-Module DIN 53457 (23°C) N/mm²  750
    Bending strength DIN 53452 N/mm²  19
    Impact strength DIN 53453 (23°C) Charpy 16
    Shore or ball pressure hardness Shore °D 60
    Coefficient of friction 0.05
  • Electrical
    Definition Norm Unit Value
    Relative electrical constant DIN 53485 (100Hz) 100 Hz 2.1
    Dielectric loss factor DIN 53483 (100Hz) tan (..x10-³ 0.00007
    Specific resistance DIN 53482 16 cm 10
    Surface resistance DIN 53482 13 10
    Creep current resistance DIN 53480 KC >600
    Breakdown voltage DIN 53481 kV/mm 40
  • Thermal
    Definition Norm Unit Value
    Crystalline melting point °C 325 - 335
    Heat conductivity DIN 52162 W/m°K 0.25
    Linear coefficient of expansion DIN 53762 mm/m°C 0.17
    Long-term no-load operating temperature °C -200 / 250
    Maximum short-term operating temperature °C 300
    Heat deformation DIN 53461 °C 121
  • Temperature range
    Minimum temperature Maximum temperature
     -200°C  +250°C

Machining data

  • Circular sawing
    Clearance angle (α) 5 - 10 [o]
    Rake angle (λ) 0 [o]
    Cutting speed 1000 [m/min]
    Tooth pitch 2.5 [mm]
  • Band sawing
    Clearance angle (α) 20 - 30 [o]
    Rake angle (λ) 5 - 8 [o]
    Cutting speed 1000 [m/min]
    Tooth pitch 2 - 5 [mm]
  • Drilling
    Clearance angle (α) 10 - 16 [o]
    Rake angle (λ) 5 - 20 [o]
    Top angle (φ) 130 [o]
    Cutting speed 150 - 200 [m/min]
    Start 0.1 - 0.3 [mm/rev]
  • Turning
    Clearance angle (α) 10 [o]
    Rake angle (λ) 5 - 8 [o]
    Setting angle (χ) 10 [o]
    Cutting speed 150 - 500 [m/min]
    Start 0.1 - 0.3 [mm]
  • Milling
    Clearance angle (α) 5 - 15 [o]
    Rake angle (λ) 5 - 15 [o]
    Cutting speed 250 - 500 [m/min]
    Start 0.3 - 3.0 [mm/rev]