Heat resistant rubber rings flexible silicone o ring

Heat resistant rubber rings require a compound suited to the temperature at the actual joint. The exposure may include repeated heating and cooling as well as time held at temperature. A flexible silicone O-ring does not establish the same working range for every formulation, cross-section or application.

Select the ring around its groove and the intended compression. The mating parts can change dimensions with temperature, so evaluate the complete joint through the relevant conditions rather than only checking a room-temperature fit. Any fluid contact and required sealing performance also belong to that assessment.

Keep the ring free from twist during fitting and avoid catching it on a sharp groove edge. Inspect the seated profile before closing the assembly. During service, look for cuts, permanent flattening and changes in the ring's shape or flexibility. A used ring that still fits into the groove may no longer provide the same contact after thermal cycling, so replacement selection should preserve both the intended dimensions and material formulation.

Material options

Silicone. Custom formulation and color for the intended contact conditions.

Hardness selection

Silicone: 20–80 Shore A. A flexible silicone O-ring does not establish the same working range for every formulation, cross-section or application.

Custom dimensions

The mating parts can change dimensions with temperature, so evaluate the complete joint through the relevant conditions rather than only checking a room-temperature fit.

Fit & assembly

Inspect the seated profile before closing the assembly.

Use & inspection

During service, look for cuts, permanent flattening and changes in the ring's shape or flexibility.

Photos illustrate structure or material only. Heat resistant rubber rings require a compound suited to the temperature at the actual joint. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.