Molded round/square rubber seal washer/O-ring/silicone gasket

A rubber seal washer can be custom molded with a round or square outline to suit the mating assembly. The outline and cross-section should be specified separately, since an O-ring and a flat gasket occupy a seat differently. The joint geometry is the starting point for selecting the finished component.

For a round arrangement, compare the relevant diameters and section. For a square shape, include the side dimensions, corner transitions, and central opening. The supported contact width should continue around the complete path without forcing the rubber across locating features.

Select the material for the actual environment and install the seal cleanly in its intended orientation. Check corners or the inner circumference before closure, then use the assembly's normal closing method. During maintenance, inspect hidden edges for damage and compare replacements with the required dimensions rather than a distorted used shape. Keep different outline and section variants separated so that similar-looking parts are not confused during servicing.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Check corners or the inner circumference before closure, then use the assembly's normal closing method.

Custom dimensions

For a square shape, include the side dimensions, corner transitions, and central opening.

Fit & assembly

A rubber seal washer can be custom molded with a round or square outline to suit the mating assembly.

Use & inspection

During maintenance, inspect hidden edges for damage and compare replacements with the required dimensions rather than a distorted used shape.

Photos illustrate structure or material only. The supported contact width should continue around the complete path without forcing the rubber across locating features. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.