Custom made round flat molded silicone rubber gasket

A round flat molded silicone rubber gasket should remain centered on its intended mating face as the joint closes. Its annular contact band needs full support, with the central opening clear of the passage it surrounds. A circular outline alone does not prevent shifting if the locating clearance is too large or the adjoining surface drags the rubber.

Choose the inner and outer diameters and thickness around the complete joint. Select the silicone formulation for the actual medium, temperature, and opening cycle. Check shoulders or fillets that may prevent the gasket from lying flat before compression begins.

Set the part in place without stretch and bring the opposing face down evenly. Inspect the perimeter for an edge displaced beyond the support. During maintenance, look for wear concentrated on one side or a ridge at the inner opening. These patterns can identify a locating or surface problem that should be corrected before another gasket is fitted into the same circular connection.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Check shoulders or fillets that may prevent the gasket from lying flat before compression begins.

Custom dimensions

A circular outline alone does not prevent shifting if the locating clearance is too large or the adjoining surface drags the rubber.

Fit & assembly

A round flat molded silicone rubber gasket should remain centered on its intended mating face as the joint closes.

Use & inspection

During maintenance, look for wear concentrated on one side or a ridge at the inner opening.

Photos illustrate structure or material only. A circular outline alone does not prevent shifting if the locating clearance is too large or the adjoining surface drags the rubber. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.