Tearing-resistant elliptical rubber washer/sealing rubber O-rings

An elliptical rubber washer needs the correct long and short dimensions to follow its sealing seat. The custom outline and section should remain supported around the curved perimeter. Material and hardness can be selected for the actual medium, temperature, and intended assembly behavior.

Do not treat the ellipse as a circular ring that can simply be stretched into place. Changing its proportions can alter the section and pull parts of the perimeter away from the seat. Define the inner opening and outside boundary independently where the contact width varies.

Install the washer without tension along its long axis and inspect the end curves before closure. Guide the mating component into alignment so that the rubber remains located. During maintenance, check for damage near the curved ends and lasting distortion along the sides. Use the original required geometry for replacement rather than copying the shape of a used ring that has changed under compression. Keep spare shaped washers flat to preserve their intended outline.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Do not treat the ellipse as a circular ring that can simply be stretched into place.

Custom dimensions

Define the inner opening and outside boundary independently where the contact width varies.

Fit & assembly

Install the washer without tension along its long axis and inspect the end curves before closure.

Use & inspection

During maintenance, check for damage near the curved ends and lasting distortion along the sides.

Photos illustrate structure or material only. The custom outline and section should remain supported around the curved perimeter. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.