Customized rubber sealing washer/silicone rubber gasket

A rubber sealing washer should be located by the joint rather than held in place only by temporary friction during assembly. The center feature, face support, and outer clearance determine whether it stays on the intended contact band as the faces close. A silicone gasket with a different outline may require separate locating features.

Define thickness and supported width around the opening. Select the formulation for the actual medium, temperature, and repeated service conditions. Check shoulders or recesses that can cause the washer to rest unevenly before compression begins.

Place the part flat and bring the adjoining component down without dragging the rubber sideways. Inspect for a displaced edge where access allows. During maintenance, compare any off center wear with the locating geometry. Correct a loose or mismatched seat before replacement instead of choosing a washer with a smaller bore solely to make it grip, since stretching the part changes its contact section and may disturb the seal elsewhere.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Check shoulders or recesses that can cause the washer to rest unevenly before compression begins.

Custom dimensions

Define thickness and supported width around the opening.

Fit & assembly

The center feature, face support, and outer clearance determine whether it stays on the intended contact band as the faces close.

Use & inspection

During maintenance, compare any off center wear with the locating geometry.

Photos illustrate structure or material only. The center feature, face support, and outer clearance determine whether it stays on the intended contact band as the faces close. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.