Plastic Injection Molding with PBT

Currently, we are releasing a blog series “What You Need To Know About.” We have been spotlighting certain plastic resins and sharing some basic knowledge on the properties of the plastic, along with common uses and functionalities. If you missed that last two, we covered ABS and polycarbonate.

What is Polybutylene Terephthalate (PBT)

PBT, or Polybutylene Terephthalate, is a plastic resin that has excellent processing characteristics. It has a lower injection molding temperature than some other engineering plastics, making the manufacturing time quicker, and more efficient – sometimes, making it a suitable replacement for resins like polypropylene. PBT can be reinforced with glass increasing its already high tensile, flexural, and compression strengths by 2 or 3 times. This reinforcement makes it comparable to Nylon 6 or Nylon 6/6.

What is Polybutylene Terephthalate (PBT) Used For?

When a material that has good dimensional stability, resistance to various chemicals, high tensile strength, and good insulation, engineers often look at PBT. There are many uses of PBT. It can be used for electronic housing, electrical components, and automobile parts. When reinforced, PBT can be used components that are flame and UV resistant.

In automotive, PBT is commonly found in the following uses:

  • Windshield wiper covers
  • Mirror housings
  • Cowl vents 
  • Handles and fans
  • Fuel system components
  • Connectors, sensor housings and fuse boxes
  • Motor components and ignition system components

PBT Fact Sheet

Chemical Formula: (C12H12O4)n  

Typical Mold Temperature: 40-80 degrees Celsius

Flexural Strength: 2-4 GPa

Tensile Strength: 40-50 MPa

Shrink Rate: 0.5%-2.2%

Specific Gravity: 1.29-1.33

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