Custom molded round silicone gasket/rubber sealing parts

A round silicone gasket should leave its central opening clear while maintaining a supported sealing band around it. The inner edge can move during compression if the gasket is oversized, poorly located, or partly unsupported. Choose the whole face geometry rather than judging the fit from the outside diameter alone.

Define thickness and contact width around the finished mating surfaces. Select the formulation for the actual medium, temperature, and service cycle. Check shoulders or recesses that can prevent the gasket from resting flat before closure.

Position concentrically on clean surfaces and bring the joint together evenly. Inspect the inner edge where accessible to confirm it has not entered a passage. During maintenance, examine for a cut or raised contact mark near the opening and compare it with the hardware. Correcting that local feature may be necessary before replacement, while choosing a smaller center hole can increase distortion rather than restore the intended clearance.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The inner edge can move during compression if the gasket is oversized, poorly located, or partly unsupported.

Custom dimensions

Define thickness and contact width around the finished mating surfaces.

Fit & assembly

Check shoulders or recesses that can prevent the gasket from resting flat before closure.

Use & inspection

Correcting that local feature may be necessary before replacement, while choosing a smaller center hole can increase distortion rather than restore the intended clearance.

Photos illustrate structure or material only. The inner edge can move during compression if the gasket is oversized, poorly located, or partly unsupported. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.