Custom silicone rubber gasket/round rubber washer for sealing

A round rubber washer should have support beneath the full contact band used for sealing. A recess, fillet, or narrow shoulder can leave part of the washer unsupported even when its outer diameter appears appropriate. The silicone gasket configuration should follow the actual mating faces and the available compression in the completed joint.

Define the inner opening, outside diameter, and thickness together. Select the formulation for the medium, temperature, and movement involved. Keep the washer clear of passages and features that could cut or twist it during closure.

Place the part flat and centered before bringing the mating surfaces together. Inspect for material pushed into a gap or a displaced inner edge. Assess the complete connection under its intended conditions. During maintenance, compare uneven flattening with the support beneath that region before replacing the washer. Correcting a hardware feature can be necessary so a new part does not receive the same concentrated contact at the same location.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The silicone gasket configuration should follow the actual mating faces and the available compression in the completed joint.

Custom dimensions

Define the inner opening, outside diameter, and thickness together.

Fit & assembly

Place the part flat and centered before bringing the mating surfaces together.

Use & inspection

During maintenance, compare uneven flattening with the support beneath that region before replacing the washer.

Photos illustrate structure or material only. A round rubber washer should have support beneath the full contact band used for sealing. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.