Molded silicone rubber seal/square gasket/flat washer

A square gasket needs corner geometry that follows the mating seat as closely as its straight sides. This custom silicone rubber seal can be developed with the required outline, central opening, and flat section. The supported contact width should remain appropriate around the complete perimeter.

Compare the corner radius and the transition into each side. A gasket may match the overall dimensions yet lift locally where those features differ. Thickness should be selected from the closing gap so that the mating parts reach their intended position.

Fit the gasket without pulling one corner ahead of the others. Check the inner edge and all four sides before the joint closes, then use the assembly's specified closing sequence. Select the silicone formulation for the actual contents and cleaning conditions. During maintenance, inspect corner transitions for tears and remove deposits from the seat. Replace with the matching outline and section rather than reshaping an approximately square washer to fit.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Check the inner edge and all four sides before the joint closes, then use the assembly's specified closing sequence.

Custom dimensions

Thickness should be selected from the closing gap so that the mating parts reach their intended position.

Fit & assembly

A square gasket needs corner geometry that follows the mating seat as closely as its straight sides.

Use & inspection

During maintenance, inspect corner transitions for tears and remove deposits from the seat.

Photos illustrate structure or material only. The supported contact width should remain appropriate around the complete perimeter. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.