Seal Thermal Stability
Low Temperature Seal Thermal Stability
The low-temperature limit is generally 15°F below TR-10 for static seals. For dynamic seals the TR-10 is more relevant. The TR-10 is the temperature at which an elastomer is able to retract 10%.
Low-temperature performance is generally a reversible process.
For design purposes compression is generally increased. The chemical media may cause swelling which may act as a plasticizer and lower the service temperature.
High Temperature Seal Thermal Stability
The high-temperature limit for seal thermal stability is generally considered a 30–50% loss of physical properties and typically represents a maximum temperature for 1,000 hours continuous service. It represents an irreversible change in the backbone or cross-link network.
The effect of high temperature can be compounded by the interaction with the chemical media. Chemical reactions typically double with a 10°C increase in temperature.
Viton® was a registered trademark of DuPont at the time the article was written and is now a registered trademark of the Chemours Company.
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