PBT (polybutylene terephthalate) is a strong and stiff engineering plastic with excellent machining characteristics, chemical resistance, and bearing and wear properties. It is often used for food processing machinery applications when low moisture absorption, resistance to staining, or resistance to cleaning chemicals is required. PBT is ideal for applications such as cams, bearings, gears, food pistons, wear strips, scraper blades, valve bodies and conveyor components.
PBT is available in FDA compliant unlubricated (Hydex® 4101) and lubricated (Hydex® 4101L) grades. Please ask your Curbell Plastics representative for more specific information.
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For a glossary of terms, see our Plastic Properties Descriptions.
TYPICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
8,690 |
| Flexural Modulus of Elasticity |
psi |
D790 |
330,000 |
| Izod Impact (notched) |
ft-lbs/in of notch |
D256 |
1.5 |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
310 130 |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
0.08 |
PHYSICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Specific Gravity |
- |
D792 |
1.30 |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
0.08 |
MECHANICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
8,690 |
| Tensile Modulus of Elasticity |
psi |
D638 |
416,000 |
| Tensile Elongation |
% |
D638 |
300 |
| Flexural Strength |
psi |
D790 |
12,000 |
| Flexural Modulus of Elasticity |
psi |
D790 |
330,000 |
| Compressive Strength |
psi |
D695 |
- |
| Hardness |
scale as noted |
D785, D2240 |
M72 |
| Izod Impact |
ft-lbs/in |
D256 |
1.5 |
THERMAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Coefficient of Linear Thermal Expansion |
in/in/°F x 10-5 |
D696 |
- |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
310 130 |
| Max Continuous Service Temperature In Air |
°F |
- |
245 |
ELECTRICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Dielectric Strength |
V/mil |
D149 |
400 |
OPTICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Light Transmittance |
% |
D1003 |
- |
| Haze |
% |
D1003 |
- |
OTHER
| |
UNITS |
ASTM TEST |
|
| Coefficient of Friction |
- |
Dynamic |
0.25 |
Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.
Still Not Sure if You Need PBT? Research PBT or Ask a Plastics Expert.