Custom mold compressing waterproof silicone washer/rubber seal

A silicone washer in a clamped connection may share space with a rigid shoulder that limits how far the parts can close. That shoulder can establish the final position even while additional turning force is applied to the fastener. The washer must be sized around the resulting space.

Identify the surfaces that come to a hard stop. Compare the distance left for the rubber with its intended working section, including any recess that hides part of its free thickness. A washer that seems tall enough beside the loose components may occupy the wrong gap once those components are nested together.

Custom dimensions allow this relationship to be developed for the particular connection. Use a compound suited to the water and other substances reaching the joint. Evaluate sealing with the hardware in its prescribed assembled position; extra tightening after a shoulder has seated may not create the contact the washer needs. If the connection fails to seal, examine the stop geometry and seating depth before replacing the rubber with an arbitrary thicker ring.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. That shoulder can establish the final position even while additional turning force is applied to the fastener.

Custom dimensions

Compare the distance left for the rubber with its intended working section, including any recess that hides part of its free thickness.

Fit & assembly

Evaluate sealing with the hardware in its prescribed assembled position; extra tightening after a shoulder has seated may not create the contact the washer needs.

Use & inspection

A silicone washer in a clamped connection may share space with a rigid shoulder that limits how far the parts can close.

Photos illustrate structure or material only. The washer must be sized around the resulting space. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.