PBT-Material Reference|Specializes in metal and plastic parts manufacturing via injection mold and CNC machining etc.

PBT

Polybutylene Terephthalate ( PBT ) / 30% Glass Fibre Reinforced

Background

The reinforcement of polybutylene terephthalate (PBT) with glass fibre results in large increases in strength, stiffness and heat distortion temperatures without loss of impact strength. The normal colour is off-white.

Key Properties

Chemical Resistance
Acids – concentrated	Good
Acids – dilute	Good
Alcohols	Very Good
Alkalis	Poor
Aromatic hydrocarbons	Good
Greases and Oils	Good
Halogens	Good
Ketones	Very Good
Electrical Properties
Dielectric constant @1MHz	4
Dielectric strength ( kV.mm^-1 )	20
Dissipation factor @ 1kHz	0.002
Volume resistivity ( Ohm.cm )	2x10¹⁴
Mechanical Properties
Elongation at break ( % )	2
Hardness – Rockwell	M93
Izod impact strength ( J.m^-1 )	70
Tensile modulus ( GPa )	12
Tensile strength ( MPa )	185
Physical Properties
Density ( g.cm^-3 )	1.63
Flammability	Self Extinguishing
Limiting oxygen index ( % )	23
Water absorption - over 24 hours ( % )	0.15-0.35
Thermal Properties
Coefficient of thermal expansion ( x10^-6 K^-1 )	20-70
Heat-deflection temperature - 0.45MPa (°C )	220
Heat-deflection temperature - 1.8MPa (°C )	200
Thermal conductivity ( W.m^-1.K^-1 )	0.24 @ 23
Upper working temperature ( °C )	120-200

Applications

Applications include those for unfilled polybutylene terphthalate (PBT) together with high power lighting components, ignition rotors, distributor caps etc.

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