Molded compressing silicone gasket/rubber O-ring/washer

A rubber O-ring is defined by its circular path and rounded working section. When a used ring is removed from a compressed joint, that section may no longer look round. Copying only the flattened sample can therefore give the wrong starting dimensions for a custom replacement.

Use the intended groove and original part specification to establish the required geometry. Compare the full seating circumference, including the depth available beneath the mating face. A used ring that has expanded or taken a lasting set should be examined as evidence of service condition rather than treated as an undistorted dimensional reference.

Keep the selected material associated with the ring size, since two compounds can share an outline while serving different environments. During fitting, preserve the ring's natural orientation around the groove and check for local twisting. If wear appears at a particular position, compare it with the adjacent hardware before reinstalling. A flat washer or a thicker round section changes the way the groove is occupied and should not be used merely because it fills a visible gap in the worn assembly.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. When a used ring is removed from a compressed joint, that section may no longer look round.

Custom dimensions

Keep the selected material associated with the ring size, since two compounds can share an outline while serving different environments.

Fit & assembly

During fitting, preserve the ring's natural orientation around the groove and check for local twisting.

Use & inspection

A used ring that has expanded or taken a lasting set should be examined as evidence of service condition rather than treated as an undistorted dimensional reference.

Photos illustrate structure or material only. When a used ring is removed from a compressed joint, that section may no longer look round. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.