Materials and Tools
Perlast®
Perlast® Perfluoroelastomer is a special type of rubber material designed to offer the unique chemical resistance of PTFE. It shares with PTFE a polymer backbone consisting of carbon atoms protected by fluorine atoms, making it very inert to chemical attack. As a rubber, therefore, it is resilient, so it doesn't creep or flow but retains sealing force over a long period. Perlast can be used in long-term conditions and has a very low oxygen permeability. It also stretches - aiding installation. For additional information on Perlast, we recommend the White Seal website.
| Temperature Range | Maximum operating temp: +280 °C (+536 °F) Minimum operating temp: -35 °C (-31 °F) |
|---|---|
| Oxygen Permeability | N/A |
| pH Range | 0 - 14 |
| Sterilization Techniques | Et-0, Gamma irradiation, thermal |
| Autoclavable? | Y |
Perlast Extended Properties
| Physical Properties | Unit | Methods | Value | |
|---|---|---|---|---|
| Hardness (points) | °IRHD | ASTM D 1415 | (=ISO 48) | 69 |
| Tensile Strength | MPa | ASTM D 412 | (=ISO 37) | 9.0 |
| Elongation at Break | % | ASTM D 412 | (=ISO 37) | 190 |
| 100% Modulus | MPa | ASTM D 412 | (=ISO 37) | 4.0 |
| Compression Set, Method B: |
Unit | Methods | Value | |
| 24 hours at 200 °C (392 °F) | % | ASTM D 395 | (=ISO 815) | 21 |
| Heat Resistance: | Unit | Methods | Value | |
| 72 hours at 250 °C (482 °F) | ASTM D 573 | (=ISO 188) | ||
| Hardness change (points) | °IRHD | ASTM D 1415 | (=ISO 48) | -7 |
| Tensile strength change | % | ASTM D 412 | (=ISO 37) | 3.5 |
| Elongation at break change | % | ASTM D 412 | (=ISO 37) | +12 |
| Low Temperature Properties: | Unit | Methods | Value | |
| TR10 | °C (°F) | ASTM D 1329 | -12 (-4) |
Special Notes
FIRE HAZARD: Ignition temperature >400 °C (750 °F).
Thermal decomposition will generate hydrogen fluoride, fluorinated hydrocarbons, carbon monoxide and carbonyl fluoride. In the event of fire, fire fighters must wear self-contained breathing apparatus and a protective suit. Extinguish with water, foam, carbon dioxide or dry chemical. Neutralise any refuse from a fire involving perfluoroelastomer with calcium hydroxide solution and wear Neoprene ® gloves when handling.