PBT
PBT (polybutylene terephthalate) [Hydex® 4101, Valox®]
Properties
- Manufactured from polybutylene terephthalate polyester (PBT-P) resin.
- Semi-crystalline thermoplastic
- Chemical-, water– and steam-resistant
- Impact-resistant
- Low coefficient of friction and wear
- Does not need lubrication
- Available in FDA-approved white and black
- Replaces brass, aluminum, steel and acetal
Common uses
- Food piston pumps
- Valve and valve bodies
- Feeder blocks
- Timing screws
- Gears
- Cams
- Bushings
- Bearings
- Wear strips
- Fuel pump components
- Fuel system connectors and rotors
PBT
Material Specifications
| ASTM or UL test | Property | Value |
Physical |
||
| D792 | Density (lb/in3)/(g/cm3) | 0.047 (1.31) |
| D570 | Water absorption, 24 hrs (%) | 0.07 |
Mechanical |
||
| D638 | Tensile strength (psi) | 9,400 |
| D638 | Tensile elongation at break (%) | 50 |
| D638 | Tensile modulus (psi) | 425,000 |
| D790 | Flexural strength (psi) | 11,600 |
| D790 | Flexural modulus (psi) | 420,000 |
| D695 | Compressive strength (psi) | 11,000 |
| D695 | Compressive modulus (psi) | - |
| D785 | Hardness, Rockwell | 120 |
| D256 | Izod notched impact (ft-lb/in) | 0.7 |
Thermal |
||
| D3418 | Melting temp (F°/C°) | 420/215 |
| D696 | Coefficient of linear thermal expansion (x 10–5 in./in./°F) |
4.5 |
| D648 | Heat deflection temp (F°/C°) at 264 psi | 200/93 |
| - | Max operating temp (F°/C°) | 221/105 |
| C177 | Thermal conductivity (BTU-in/ft²-hr-°F) |
- – |
| UL94 | Flammability rating | H-B |
Electrical |
||
| D150 | Dielectric constant at 60 Hz | 3.3 |
| D150 | Dissipation factor at 60 Hz | 0.002 |
| D149 | Dielectric strength (V/mil) short time, ⅛” thick |
410 |
| D257 | Volume resistivity (ohm/cm) at 50% RH | 4.5 x 1016 |
These are typical values for reference and comparison only. They should not be used as a basis for design specifications or quality control. Contact us for the manufacturers’ complete material property datasheets. All values were taken at 73°F (23°C) unless otherwise noted.
Don’t see what you’re looking for? Call us at 800–423-2769 or email us at tom@crownplasticsinc.com.
*Hydex® is registered trademark of Ensinger.
