Custom molded rubber O-ring/square silicone sealing gasket

A square silicone sealing gasket should follow the joint's contact path while using the section appropriate to the mating surfaces. A round cord O-ring and a flat square gasket are different configurations, even if both can be described as rings. Select the format from the actual retaining geometry rather than substituting by approximate outside dimensions.

Check the side lengths, corner radii, thickness, and supported sealing width. Choose the compound for the medium, temperature, and cleaning conditions. Keep narrow regions beside openings fully supported when the joint closes.

Install the gasket flat without pulling its corners outward to reach the seat. Bring the faces together evenly and inspect for folding or displacement. During service, compare the contact pattern along the sides with that at the corners. If compression differs substantially, examine the closing surfaces and fastening arrangement before replacement rather than adding section thickness that changes every contact region in the joint.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Coordinate the square gasket firmness with the section and corner support so the closing faces compress the full contact path.

Custom dimensions

Check the side lengths, corner radii, thickness, and supported sealing width.

Fit & assembly

Install the gasket flat without pulling its corners outward to reach the seat.

Use & inspection

If compression differs substantially, examine the closing surfaces and fastening arrangement before replacement rather than adding section thickness that changes every contact region in the joint.

Photos illustrate structure or material only. A square silicone sealing gasket should follow the joint's contact path while using the section appropriate to the mating surfaces. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.