Polyethyleneterephtalate (PET)
DIN abbreviation: PET
Short description of material
A partially crystalline thermoplastic with high hardness, stiffness and mechanical strength as well as good creep resistance. PET has very good sliding properties and shows very little wear. Because of its good dimensional stability, it is also suitable for parts with tight dimensional tolerance requirements.
Colours: natural ( white) , black
Application
- Precision bushings
- Switching wheel
- Cams
- Counting mechanisms
- Insulations
TECHNICAL PROPERTIES
| Material standard values | Method | Dry | Measure |
| Mechanical values | |||
| Density | ISO 1183 | 1.38 | g/cmᶾ |
| Yield stress | ISO 527 | 80 | Mpa |
| Elongation due to tearing | ISO 527 | 40 | % |
| Modulus of elasticity resulting from tensile test | ISO 527 | 3.000 | Mpa |
| Modulus of elasticity resulting from bending test | ISO 178 | 2.600 | Mpa |
| Flexural strenght | ISO 178 | 125 | Mpa |
| Impact strenght ₁ | ISO 179 | W.B | KJ/m² |
| Notched-bar impact strength | ISO 179 | >4 | KJ/m² |
| Ball indentation hardness H358/30 | ISO 2039-1 | 140 | MPa |
| Creep rate stress at 1% alongation ₂ | DIN 53 444 | 13 | Mpa |
| Sliding friction coefficiet against steel ₃ | – | 0.25 | – |
| Sliding wear against steel ₃ | – | 0.35 | μm/km |
| Thermal values | |||
| Melting temperature | ISO 3146 | 255 | °C |
| Thermal conductivity | DIN 52 612 | 0.24 | W/(K*m) |
| Specific thermal capacity | – | 1.1 | J/(g*K) |
| Coefficient of linear expansion ₄ | – | 7-8 | 10-5*K-1 |
| Operating temperature range (longterm) ₅ | – | -20 / + 100 | °C |
| Operating temperature range (short-term) ₅ | – | 160 | °C |
| Fire behaviour | UL 94 | HB | – |
| Electrical values | |||
| Dielectric constant ₆ | IEC 250 | 3.6 | – |
| Dielectric loss factor ₆ | IEC 250 | 0.008 | – |
| Specific volume resistance | IEC 93 | 1016 | Ω*cm |
| Surface resistance | IEC 93 | 1014 | Ω |
| Dielectric strenght | IEC 243 | 50 | KV/mm |
| Creep current resistance | IEC 112 | CTI 600 | – |
| Miscellaneous data | |||
| Moisture absorption in normal climate until saturated | DIN 53 715 | 0.25 | % |
| Water absorption until saturated | ISO 62 | 0.5 | % |
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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