Glass-filled PBT supplier — dimensionally stable grades for connectors and electrical parts

About glass-filled PBT

PBT is a fast-crystallizing engineering polyester. With glass fiber it becomes stiff, strong and heat resistant, while absorbing very little moisture, so parts hold their dimensions in humid conditions better than nylon. It’s a standard material for connectors, sensors and electrical housings, often in flame-retardant form. The watch-outs: it must be dried before molding, and standard grades can lose properties in long-term hot, wet service (hydrolysis-resistant grades address this).

Grades we source

• PBT GF15, GF20, GF30
• Flame-retardant (UL 94 V-0) grades
• Hydrolysis-resistant grades
• Low-warp glass/mineral grades
• Impact-modified grades
• Natural and black

Common applications

• Electrical connectors and terminal blocks
• Sensor and relay housings
• Ignition and automotive electrical parts
• Lamp sockets and lighting components
• Appliance handles and housings

Typical properties (30% glass)

Property ranges are general guidance and vary by grade and supplier; our team confirms the exact spec and certification for your application.

Related materials: Fix: UL 94 flame ratings · Compare: PBT vs. PET · PET / PBT · Glass-filled nylon · Electrical & electronics · all materials