Customized waterproof silicone rubber gasket/flexible rubber washer

A flexible rubber washer can conform locally between mating components, but it still needs a defined seating area. Flexibility can make the ring easier to handle into position while also allowing it to shift, stretch, or fold if the joint does not locate it adequately.

Match the inner opening and outside profile to the available support faces. Consider how the parts approach each other during closure: a sliding or angled assembly motion can move the washer away from its intended position. Any locating feature should retain the ring without distorting its working cross-section.

Check the seated condition before completing fastening and assess the finished connection for its required water-exclusion performance. A flexible feel does not establish a waterproof rating or compatibility with every medium. On opening the joint, inspect the contact pattern and compare it around the perimeter. Local pinching or an unsupported stretched area points to an assembly or geometry issue that should be addressed before simply fitting another ring of the same material.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Flexibility can make the ring easier to handle into position while also allowing it to shift, stretch, or fold if the joint does not locate it adequately.

Custom dimensions

Match the inner opening and outside profile to the available support faces.

Fit & assembly

Consider how the parts approach each other during closure: a sliding or angled assembly motion can move the washer away from its intended position.

Use & inspection

On opening the joint, inspect the contact pattern and compare it around the perimeter.

Photos illustrate structure or material only. Flexibility can make the ring easier to handle into position while also allowing it to shift, stretch, or fold if the joint does not locate it adequately. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.