Brand names: Cycolac, Lustran, Hival

What is PBT?

Polybutylene Terephthalate (PBT) is a semi-crystalline thermoplastic that belongs to the polyester family of polymers. It has several different grades that will allow for reinforcement, filled, impact modification, and flame retardancy. It has excellent mechanical and electrical characteristics, it’s stain-resistant, light, and has exceptional short-term mechanical properties.  With high dielectric strength PBT protects electrical and electronic components. It is highly resistant and guards against leakage and breakdown in power circuitry.

Polybutylene Terephthalate Structure

Polybutylene Terephthalate (PBT)

Polybutylene Terephthalate (PBT) Part – Agriculture



  • Stain-resistant
  • Lightweight
  • Excellent short-term mechanical properties
  • Can last short term thermal excursions and long-term heat exposure
  • High dielectric strength
  • Block UV radiation, excellent heat aging behavior
  • Chemical resistance



  • High mold shrinkage
  • Poor resistance to hydrolysis (sensitive to hot water)
  • Prone to warping
  • Unreinforced PBT is notch sensitive
  • Low HDT at 60° degree Celsius (140° Fahrenheit)

PBT Polyester (Polybutylene Terepthalate)
– Consumer Products

How can I use it?

PBT can be used for various industries, such as industrial, medical, and consumer fields.


Common applications for the industrial market include electrical, electrical components, windshield wiper covers, mirror housings, cowl vents.

Properties of PBT

The polymer displays excellent mechanical and electrical properties. Review the key properties of this polyester material discussed below.

  • It has excellent stain resistant and machining characteristics
  • It enables efficient use of material to reduce weight and cost
  • It delivers excellent short-term mechanical properties, such as high strength, toughness and stiffness as well as good practical impact
  • It provides good creep resistance, dimensional stability and low moisture absorption characteristics



Elongation at Break 5-300%
Elongation at Yield 3.5-9%
Flexibility (Flexural Modulus) 2-4 GPa
Hardness Rockwell M 70-90
Hardness Shore D 90-95
Stiffness (Flexural Modulus) 2-4 GPa
Strength at Break (Tensile) 40-50 MPa
Toughness (Notched Izod Impact at Room Temperature) 27-999 J/m
Toughness at Low Temperature (Notched Izod Impact at Low Temperature) 27-120 J/m
Young’s Modulus 2-3 GPa
Coefficient of Linear Thermal Expansion 6-10 x 10-5 /°C
Shrinkage 0.5-2.2%
Water Absorption 24 hours 0.1-0.2%

Source: Omnexus

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