Customized silicone rubber rectangle gasket washer

A rectangle gasket washer provides a custom rubber interface for a rectangular seating area. Its straight runs and corners need to align with the mating faces so the rubber is supported where compression is applied. The inner opening should also remain clear of the passage or component it surrounds.

Check the corner shape before installation. A gasket can match the overall length and width yet sit poorly if its corner radius differs from the joint. Position the part without pulling one side to reach a fastening point. Cut or molded construction and the selected rubber should suit the required geometry and environment. As the joint closes, watch for a side being dragged inward or pushed beyond the supporting edge. During later disassembly, inspect the corners separately from the straight sections, since local folds can be hidden while the joint is assembled. Replace a damaged gasket after clearing the mating faces, and maintain the intended thickness rather than stacking thin pieces to recreate an approximate fit.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Its straight runs and corners need to align with the mating faces so the rubber is supported where compression is applied.

Custom dimensions

A gasket can match the overall length and width yet sit poorly if its corner radius differs from the joint.

Fit & assembly

Position the part without pulling one side to reach a fastening point.

Use & inspection

Replace a damaged gasket after clearing the mating faces, and maintain the intended thickness rather than stacking thin pieces to recreate an approximate fit.

Photos illustrate structure or material only. As the joint closes, watch for a side being dragged inward or pushed beyond the supporting edge. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.