PBT Injection Molding

PBT resin offers excellent processability, electrical properties, and good surface finish quality


Polybutylene terephthalate (PBT) is semi-crystalline thermoplastic with excellent processibility and good mechanical properties, which make it a versatile general purpose resin for wide range of applications.

We offer three grades of PBT through our injection molding service:

  • Valox 357: A polycarbonate/PBT blend that is a general purpose resin. It also has flame retardant with a UL V0 and 5VA rating.
  • Valox 420 SEO (30% Glass Filled): A glass-filled PBT resin with flame retardant and well rounded mechanical properties.
  • Crastin S600F20: Friction and wear resistance with excellent colorability.

PBT Material Properties

  Tensile Strength
Flexural Modulus Tensile Elongation (Break) Rockwell Hardness
Data Sheet
Test Method ISO 527 ISO 178 ISO 527 ASTM D785  
Valox 357 7,250 psi 290,000 psi 30% 117  VIEW PDF
Valox 420 SEO 17,400 psi 1.38E+6 psi 1.9% 119 VIEW PDF
Crastin S600F20 7,980 319,000 psi 40% n/a VIEW PDF

PBT Applications

PBT resins are used for a wide range of applications due to its well-rounded mechanical properties.

  • Enclosures
  • Switches
  • Electrical components
  • Bobbins
  • Automotive parts