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Polybutylene Terephthalate ( PBT ) - Properties and Applications - Supplier Data by Goodfellow

Topics Covered

Background

Key Properties

Applications

About Goodfellow

Background

Polybutylene Terephthalate (PBT) is a semi-crystalline, white or off-white polyester similar in both composition and properties to polyethylene terephthalate (PET). It has somewhat lower strength and stiffness than polyethylene terephthalate, PET, is a little softer but has higher impact strength and very similar chemical resistance. As Polybutylene Terephthalate (PBT) crystallises more rapidly than PET, it tends to be preferred for industrial scale moulding.

Key Properties

The key properties of Polybutylene Terephthalate ( PBT ) are tabulated below.

Table 1. Key properties

Chemical Resistance

 

 

 

Acids - dilute

Good

Alcohols

Good

Alkalis

Poor-Good

Aromatic hydrocarbons

Good

Greases and Oils

Good

Ketones

Good

Electrical Properties

 

 

 

Dielectric constant @1kHz

3.2

Dielectric strength ( kV.mm-1 )

20

Dissipation factor @ 1kHz

0.002

Volume resistivity ( Ohm.cm )

1015

Mechanical Properties

 

 

 

Elongation at break ( % )

250

Hardness – Rockwell

M70

Izod impact strength ( J.m-1 )

60

Tensile modulus ( GPa )

2

Tensile strength ( MPa )

50

Physical Properties

 

 

 

Density ( g.cm-3 )

1.31

Limiting oxygen index ( % )

25

Water absorption - over 24 hours ( % )

0.1

Thermal Properties

 

 

 

Heat-deflection temperature - 0.45MPa (°C )

150

Heat-deflection temperature - 1.8MPa (°C )

60

Upper working temperature (°C )

120-?

Properties Polybutylene Terephthalate Monofilament

 

Property

 

 

Value

Density

g.cm-3

 

 1.31

Extension to break

%

 

 26

Shrinkage @100°C

%

 

 3

Tensile strength

GPa

 

 0.5

Applications

Applications of Polybutylene Terephthalate (PBT) include electrical and automotive components (including “under-bonnet”) and power tool casings.

About Goodfellow

Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.

 

 

Source: Goodfellow.

 

For more information on this source please visit Goodfellow.

 

Date Added: May 26, 2003 | Updated: Jun 11, 2013
Comments
  1. Luc Chene Luc Chene Canada says:

    Is making toothbrush bristles from PBT a good application ? Can't Bisphenol leach from it ?

  2. aravind vatsala aravind vatsala United States says:

    Hi I am using PBT material - Clip, have breakage issue.

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