Complete Guide on Polybutylene Terephthalate (PBT)

Providing innovative solutions that save weight and decrease costs along with other benefits, PBT has made its place in end-markets like automotive, consumer goods as well as electrical & electronics.

Explore polybutylene terephthalate (PBT) in detail along with its key properties like mechanical, thermal, electrical, etc. and understand what makes it an ideal choice in high-end engineering applications. Also, learn about few polybutylene terephthalate blends with PC, PET and conditions to process this polymer material. Let’s first start by understanding PBT plastic and how it is made…

Properties of PC/PBT Blend

Several properties of polycarbonate polybutylene terephthalate blend have been discussed in the above guide. In this section, you'll find PC/PBT Blend properties in a comprehensive manner. Check out the table below which enlists all possible and significant properties of polycarbonate/polybutylene terephthalate blend along with their values.

Property Value
PC/PBT Blend Dimensional Stability
Shrinkage 0.6 - 1.1 %
Water Absorption 24 hours 0.03 - 0.5 %
PC/PBT Blend Electrical Properties
Dielectric Constant 2.95 - 3.14 
Dissipation Factor 190 - 300 10-4
Volume Resistivity 16 - 17 1015 Ohm.cm
Fire Performances
Flammability UL94 HB
PC/PBT Blend Mechanical Properties
Elongation at Break - 175 %
Elongation at Yield 4.4 - 4.5 %
Flexibility (Flexural Modulus) 1.6 - 3.9 GPa
Stiffness (Flexural Modulus)
Toughness (Notched Izod Impact at Room Temperature) 50 - 960 J/m
Toughness at Low Temperature (Notched Izod Impact at Low Temperature) 170 - 640 J/m
Young Modulus 1.8 - 2.3 GPa
PC/PBT Blend Physical Properties
Density 1.17 - 1.3 g/cm3
Radiation Resistance
Gamma Radiation Resistance Good
UV Light Resistance Fair
Service Temperature
HDT @0.46 Mpa (67 psi) 91 - 118 °C
HDT @1.8 Mpa (264 psi) 60 - 121 °C
Max Continuous Service Temperature
Sterilization Resistance (Repeated) Poor

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