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PBT

Polybutyleneterephthalate

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Overview

Applications

Comparison

Chemical formula

Specific gravity

1.31

Thermal properties

40

Tg(℃)

230

Tm(℃)

Characteristics

Chemical resistance

High Toughness

Heat resistance with GF

Injection moldability

Electrical insulation resistance

No dimensional stability

Commentary

It is synthesized by condensation polymerization of terephthalic acid and 1,4-butanediol. Because it has an ester bond (-COO-) in main chain of polymer, hydrolysis occurs in high temperature and high humidity environments, and its strength decreases.

Key points

Widely used for electrical and electronic connector applications by high electrical insulation resistance, dimensinal stability and lower water absorption rate than PA.

Reinforced with glass fiber, it can be used for applications requiring rigidity and heat resistance.

There is a similar crystalline polyester resin called GF-reinforced PET, which has higher heat resistance than GF-PBT, but PBT is better for injection molding.

使われ方

Connectors

Reason for adoption

Good at electrical perfomance (electrical insulation resistance, tracking resistance), easy to formulate for flame retardancy, can withstand use at high temperatures (with GF)

Headlight housings

Reason for adoption

Balanced strength, electrical properties, heat resistance, good injection moldability

EV chargers (PBT/PC alloy)

Reason for adoption

Electrical properties, flame retardancy, weather resistance

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