Polybutylene terephthalate (PBT)



We use this material in the following process(es):


  • Injection moulding.
    Injection moulded parts up to 16000 g


General properties
Material number 1311
Density ISO 1183 1,30 g/cm³
Transparency op
Condition of the test specimen

Mechanical properties
Stress at yield ISO 527 60 MPa
Tensile strength ISO 527 – MPa
Elongation at break ISO 527 200 %
Tensile modulus ISO 527 2500 MPa
Tensile creep modulus (0,5% 1000h) ISO 899-1 1200 MPa
Flexural strength ISO 178 85 MPa
Flexural fatigue strength (107 cycles) ASTM D671 30 MPa
Ball pressure hardness ISO 2039-1 130 MPa
Standard for ball pressure hardness H358 / 30
Hardness Shore (A/D) or Rockwell (R/L/M) ISO 868, ISO 2039-2 – -
Izod impact strength 23 °C ISO 180/1C 184 KJ/m²
Izod impact strength -30 °C ISO 180/1C 139 KJ/m²
Izod notched impact strength 23 °C ISO 180/1A 6,5 KJ/m²
Izod notched impact strength -30 °C ISO 180/1A 3,6 KJ/m²
Charpy impact strength 23 °C ISO 179/1eU 290 KJ/m²
Charpy impact strength -30 °C ISO 179/1eU – KJ/m²
Charpy notched impact strength 23 °C ISO 179/1eA 6 KJ/m²
Charpy notched impact strength -30 °C ISO 179/1eA 4 KJ/m²
Izod notched impact strength 23 °C ISO 180/4A 60 J/m
Izod notched impact strength -40 °C ISO 180/4A – J/m
Friction against steel without lubrication 0,23-0,35 -
Abrasion relative to pressure 9 (µm/km)/MPa

Electrical properties
Dielectric constant 50 Hz IEC 60250 3,3 -
Dielectric constant 1 MHz IEC 60250 3,3 -
Dissipation factor 50 Hz IEC 60250 10 10-4
Dissipation factor 1 MHz IEC 60250 200 10-4
Dielectric strength IEC 60243-1 13 kV/mm
Thickness for electric strength 1,6 mm
Volume resistivity IEC 60093 1E14 Ω · m
Surface resistivity IEC 60093 1E13 Ω
Comparative tracking index IEC 60112 550 -
Comparative tracking index CTI M IEC 60112 450M -

Thermal properties
Thermal conductance ISO 22007 0,27 W/K m
Specific heat IEC 1006 1,50 J/g K
Linear thermal expansion along|cross to direction of flow ISO 11359 130-160 10-6/K
Melting point ISO 11357 225 °C
Heat distortion temperature A ISO 75 HDT/A (1,8 MPa) 65 °C
Heat distortion temperature B ISO 75 HDT/B (0,45 MPa) 165 °C
Vicat softening point A ISO 306 VST/A/50 (10 N) – °C
Vicat softening point B ISO 306 VST/B/50 (50 N) – °C
Short time use temperature 150 °C
Continuous use temperature 140 5) °C
Minimal use temperature -50 °C

Chemical properties
mineral oils +
Aliphatic hydrocarbons +
Aromatic hydrocarbons o
Petrol +
Weak mineral acids +
Strong mineral acids o
Weak organic acids +
Strong organic acids –
Oxidising acids –
Weak alkalis o
Strong alkalis –
Trichlorethylene –
Perchlorethylene o
Acetone –
Alcohol +
Hot water (hydrolysis resistance) –
UV-light and weathering o

Other properties
Humidity absorption at 23°C/50% ISO 62 0,25 %
Water absorption ISO 62 0,5 %
Flammability UL 94 IEC 60695-11-10 HB -
Thickness for UL 94 0,75 mm
Limiting oxygen index ISO 4589 20 %
Raw material Ultradur B4500 (BASF)

Remarks


5): Thermal ageing UL 746 (RTI) Mechanical W/O Imp., 40000 h
na): not applicable
+: resistant
o): partly resistant
-: not resistant

This datasheet is a print-out of the material database RIWETA 4.2 and is intended for personal use only.

The figures in this datasheet are guide values. The values are affected by processing conditions, modifications, additives and environmental conditions and they do not release you from the obligation to check the validity and to undertake tests on your own. The information given is based on our state of knowledge. The material data is not to be construed as guaranteeing specific properties and the data can not be used to deduce the suitability for a particular application.

It remains the responsibility of the user of our products not to infringe patent rights and to comply with existing laws and regulations.

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