ENGINEERING MATERIAL

PBT Plastic

A high-performance choice for electrical and automotive components. Polybutylene Terephthalate (PBT) is a strong, stiff, and stable thermoplastic polyester with exceptional insulating properties.

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An industrial fixture for holding electronics, an ideal application for a stable insulator like PBT

The Insulator's Choice: Stable and Strong

PBT is a semi-crystalline thermoplastic in the polyester family. It is valued for its high strength, stiffness, and excellent dimensional stability, particularly in applications where electrical insulation and chemical resistance are paramount.

Excellent Electrical Insulator

PBT has very high dielectric strength and volume resistivity, making it an ideal material for electrical connectors, switches, bobbins, and sensor housings.

Great Dimensional Stability

With very low moisture absorption, PBT parts do not change size or shape in humid environments. Glass-filled grades also have a very low coefficient of thermal expansion.

Good Chemical Resistance

PBT offers good resistance to a wide range of chemicals, including fuels, oils, fats, and many solvents, making it suitable for demanding automotive applications.

PBT in Manufacturing

PBT is primarily processed via injection molding, where its excellent flow properties allow it to fill complex, thin-walled parts with ease. It is particularly popular in glass-filled grades (e.g., PBT-GF30, containing 30% glass fiber), which dramatically increases its strength, stiffness, and heat resistance.

A precision molded automotive part, a key application for PBT plastic

PBT Plastic FAQ

What is the difference between PBT and PET?

Both are thermoplastic polyesters. PET (Polyethylene Terephthalate) is most commonly known for making beverage bottles and fibers. PBT has a lower strength and stiffness than PET but offers better impact resistance, processes more easily in injection molding, and has better dimensional stability due to lower moisture absorption.

Is PBT flame retardant?

Standard PBT is not flame retardant. However, like ABS, it is widely available in flame-retardant (FR) grades that meet UL94 V-0 standards. These grades are essential for use in connectors and housings for electronics and appliances.

What are the main applications for PBT?

Its main applications are in the automotive and electronics industries. Examples include electrical connectors, sensor housings, ignition system components, relay boxes, switches, and bobbins for coils.