Custom molded square silicone sealing gasket/rubber seal

A square silicone sealing gasket should align at all four corners before the mating faces close. The corner radii and side lengths need to follow the actual joint, since stretching one corner into position can distort the opposite side. The contact band should remain supported around the full outline.

Choose thickness around the closing gap and check the locations of fasteners or retaining features. Select the silicone formulation for the actual medium, temperature, and cleaning process. The assembly should apply the intended compression without forcing the gasket to correct an uneven face.

Lay the part flat and bring the opposing surface down squarely. Inspect for trapped corners and material displaced into the central opening. During disassembly, compare compression at the corners with that along the sides. If contact is uneven, review the closing arrangement and surface support before replacement rather than adding thickness across the whole gasket and changing the contact at regions that were already correctly compressed.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The corner radii and side lengths need to follow the actual joint, since stretching one corner into position can distort the opposite side.

Custom dimensions

Choose thickness around the closing gap and check the locations of fasteners or retaining features.

Fit & assembly

A square silicone sealing gasket should align at all four corners before the mating faces close.

Use & inspection

Select the silicone formulation for the actual medium, temperature, and cleaning process.

Photos illustrate structure or material only. The corner radii and side lengths need to follow the actual joint, since stretching one corner into position can distort the opposite side. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.