Custom flat silicone gasket rubber sealing washer

A flat silicone gasket can act as a sealing washer within a custom assembly. Its dimensions should match the center feature, outer support area, and space available between the mating parts. Once the joint closes, much of the gasket may be hidden, making initial positioning particularly useful.

Place the washer where its center opening aligns naturally with the intended feature. Check that the outer edge remains inside the supported area and that no section has folded underneath. If the mating part moves laterally during assembly, guide it so that it does not drag the silicone out of position.

Choose the formulation for the actual medium, temperature, and cleaning method. Thickness should follow the designed closing gap rather than being increased to conceal surface damage. During maintenance, inspect the seat and gasket together for signs of uneven contact. Remove deposits without scratching across the sealing path. Replace a washer that has torn or permanently changed shape with the matching profile, preserving the intended compression when the assembly is closed again.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Thickness should follow the designed closing gap rather than being increased to conceal surface damage.

Custom dimensions

If the mating part moves laterally during assembly, guide it so that it does not drag the silicone out of position.

Fit & assembly

Place the washer where its center opening aligns naturally with the intended feature.

Use & inspection

During maintenance, inspect the seat and gasket together for signs of uneven contact.

Photos illustrate structure or material only. Once the joint closes, much of the gasket may be hidden, making initial positioning particularly useful. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.