PBT Polyester (Polybutylene Terepthalate)

PBT polyesters are semi-crystalline. They are versatile materials with a good range of properties. They have excellent electrical properties and are abrasion resistant. PBT has been extensively compounded giving a very wide range of properties. PBT performs much like Nylon but can handle higher temperatures and does not absorb moisture. PBT has excellent impact strength but is very notch sensitive. PBT is very anisotropic in shrinkage, so it is difficult to mold to extremely tight tolerances.

Applications: Industrial equipment applications, business equipment, automotive housings-under the hood, power tool casings.

Advantage

 

Good flow
Tough
Hydrollysis Resistant
High Impact
Easily Processed

Disadvantage

 

Low Max. Use temperature
Lower Stiffness than similar PET
Lower Strength than similar PET
Attacked by Strong Bases

Tensile StrengthFlexural ModulusImpact StrengthMax Temp.Chemical Resistance
6,000-13,000 psi300,000-1,200,000 psi1 ft-lb/in notched izod250°-420° FFair to Good