Materials

PBT (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.

CelanexValoxUltradur

Typical Properties

Tensile Strength6,000-13,000 psi
Flexural Modulus300,000-1,200,000 psi
Impact Strength1 ft-lb/in notched izod
Max Temperature250°-420° F
Chemical ResistanceFair to Good

Applications

  • Industrial equipment applications
  • Business equipment
  • Automotive under-the-hood housings
  • Power tool casings

Advantages

  • + Good flow
  • + Tough
  • + Hydrolysis resistant
  • + High impact
  • + Easily processed

Disadvantages

  • − Low maximum use temperature
  • − Lower stiffness than similar PET
  • − Lower strength than similar PET
  • − Attacked by strong bases
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