Polytetrafluoroethylene (PTFE)
DIN abbreviation: PTFE
Short description of material
A high crystalline fluoropolymer with excellent sliding properties, an anti-adhesive surface, the best insulating properties and an almost universal chemical resistance. Disadvantages are its low mechanical strength and high specific weight.
Aplication examples
- Bearings
- Bushings
- Shaft seals
- Piston rings
- Insulators thread guides
Colours: natural (white)
| Material standard values | Method | Dry | Measure |
| Mechanical values | |||
| Density | ISO 1183 | 2.18 | g/cmᶾ |
| Yield stress | ISO 527 | 25 | Mpa |
| Elongation due to tearing | ISO 527 | 380 | % |
| Modulus of elasticity resulting from tensile test | ISO 527 | 750 | Mpa |
| Modulus of elasticity resulting from bending test | ISO 178 | 540 | Mpa |
| Flexural strenght | ISO 178 | 6 | Mpa |
| Impact strenght ₁ | ISO 179 | W.B | KJ/m² |
| Notched-bar impact strength | ISO 179 | 16 | KJ/m² |
| Ball indentation hardness H358/30 | ISO 2039-1 | 30 | MPa |
| Creep rate stress at 1% alongation ₂ | DIN 53 444 | 1.5 | Mpa |
| Sliding friction coefficiet against steel ₃ | – | 0.08 | – |
| Sliding wear against steel ₃ | – | 21 | μm/km |
| Thermal values | |||
| Melting temperature | ISO 3146 | 327 | °C |
| Thermal conductivity | DIN 52 612 | 0.23 | W/(K*m) |
| Specific thermal capacity | – | 1 | J/(g*K) |
| Coefficient of linear expansion ₄ | – | 18-20 | 10-5*K-1 |
| Operating temperature range (longterm) ₅ | – | – 200/ +260 | °C |
| Operating temperature range (short-term) ₅ | – | 280 | °C |
| Fire behaviour | UL 94 | V-0 | – |
| Electrical values | |||
| Dielectric constant ₆ | IEC 250 | 2.1 | – |
| Dielectric loss factor ₆ | IEC 250 | 0.0005 | – |
| Specific volume resistance | IEC 93 | 1018 | Ω*cm |
| Surface resistance | IEC 93 | 1017 | Ω |
| Dielectric strenght | IEC 243 | 40 | KV/mm |
| Creep current resistance | IEC 112 | CTI 600 | – |
| Miscellaneous data | |||
| Moisture absorption in normal climate until saturated | DIN 53 715 | <0,01 | % |
| Water absorption until saturated | ISO 62 | <0,01 | % |
₁ – Measured with pendulum impact testing machine 0,1 DIN 51 222
₂ – Tension resulting in 1% total elongation after 1000h
₃ – Against steel, hardened and ground: P=0.05 Mpa, V=0.6 m/s, t=60 °C
₄ – For temperature range of +23 до +60 °C
₅ – Short-term = max 1 h; long-term = months
₆ – at 10⁶ Hz
1 Mpa= 1 N/mm2
1 g/cm3=1.000 kg/m3
1 kV/mm=1 Mv/m
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