Compression-molded NBR/SBR rubber seal o-ring/washers

A rubber seal o-ring in an NBR or SBR specification should be selected around the actual joint and its service environment. Matching the diameter is only one part of replacement. The compound also influences how the ring responds to the contacting medium, temperature, and compression, so visually similar rings should remain identified by their intended specification.

Compare the section with the groove and the gap after assembly. A ring that is too large in section can resist closure or become pinched, while an undersized section may not establish the intended contact. Washer formats need their own face dimensions and should be treated as a different sealing geometry.

Keep the fitting route smooth and free of dirt. Introduce the ring without twisting it, and protect it from thread crests or shoulders that can cut the surface. When removing a used seal, note where damage occurred and inspect the corresponding mating feature. Correcting a sharp edge or an uneven closing condition is more useful than repeatedly replacing a damaged ring without addressing its cause.

Material options

NBR / SBR. Custom formulation and color for the intended contact conditions.

Hardness selection

Rubber: 30–90 Shore A. The compound also influences how the ring responds to the contacting medium, temperature, and compression, so visually similar rings should remain identified by their intended specification.

Custom dimensions

A ring that is too large in section can resist closure or become pinched, while an undersized section may not establish the intended contact.

Fit & assembly

Compare the section with the groove and the gap after assembly.

Use & inspection

When removing a used seal, note where damage occurred and inspect the corresponding mating feature.

Photos illustrate structure or material only. A ring that is too large in section can resist closure or become pinched, while an undersized section may not establish the intended contact. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.