Silicone rubber flat washer/rubber o rings/rubber gaskets

A silicone rubber flat washer provides a broad, flat contact section around an opening. The custom inner and outer dimensions should match the mating faces or receiving recess. Its geometry differs from a round-section O-ring, so the joint should be designed for the selected form.

Check how the rubber is supported when the parts close. A flat washer needs room across its width, while a round ring typically occupies a groove that controls its deformation. Similar diameters alone do not make those parts interchangeable. Thickness also affects the final assembly position.

Select the silicone compound for the medium, temperature, and cleaning routine. Install the washer on clean surfaces and keep it centered without twist or unnecessary stretch. Avoid using excessive fastening force to make an unsuitable thickness fit. Inspect the complete joint under its expected conditions, then check the rubber and mating surfaces during maintenance. A replacement should preserve the intended profile rather than conceal wear or misalignment in the adjoining components.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. A flat washer needs room across its width, while a round ring typically occupies a groove that controls its deformation.

Custom dimensions

A silicone rubber flat washer provides a broad, flat contact section around an opening.

Fit & assembly

Check how the rubber is supported when the parts close.

Use & inspection

Inspect the complete joint under its expected conditions, then check the rubber and mating surfaces during maintenance.

Photos illustrate structure or material only. A silicone rubber flat washer provides a broad, flat contact section around an opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.