Custom waterproof silicone rubber oval washer/O-ring

A silicone rubber oval washer needs its long and short dimensions matched to the intended seat. The curved ends and connecting sides establish an elongated contact path that differs from a round ring. Custom molding can adapt the outline and section to the assembly.

Compare the inner opening and outer boundary separately. The supported width may vary around the perimeter if the mating shape is not a simple offset oval. Check the end curves and any locating features before selecting the thickness needed for the closing gap.

Choose the silicone formulation for the actual medium and temperature. Position the washer without stretching its long axis to reach the ends of the seat. Inspect the side sections for lifting before the mating part closes. Water-related protection should be assessed on the complete joint under its intended conditions. During servicing, check the end curves for tearing and the straight regions for permanent distortion. Use the specified oval profile for replacement rather than reshaping a circular ring into the opening.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Check the end curves and any locating features before selecting the thickness needed for the closing gap.

Custom dimensions

The supported width may vary around the perimeter if the mating shape is not a simple offset oval.

Fit & assembly

Position the washer without stretching its long axis to reach the ends of the seat.

Use & inspection

Use the specified oval profile for replacement rather than reshaping a circular ring into the opening.

Photos illustrate structure or material only. The curved ends and connecting sides establish an elongated contact path that differs from a round ring. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.