Custom made rectangular silicone rubber gasket and seals

A rectangular silicone rubber gasket follows a sealing path with long sides and defined corner transitions. The mating cover may apply compression differently near fasteners and between them, so even closure along the full perimeter is part of the joint design. The gasket should match the opening and support area without being stretched to reach the corners.

Check side lengths, corner radii, thickness, and any fixing holes. Preserve sufficient contact width beside each opening and keep the inner edge clear of the intended passage. Select the silicone formulation around the medium, temperature, and cleaning process at the joint.

Lay the gasket flat and bring the mating faces together evenly. Inspect exposed sides for waves or material pushed out of the seat. After disassembly, compare the contact pattern along the middle of the long sides with the areas near fasteners. Uneven flattening can indicate a cover or closing condition that should be corrected before replacement rather than hidden by adding thickness to the entire gasket.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The mating cover may apply compression differently near fasteners and between them, so even closure along the full perimeter is part of the joint design.

Custom dimensions

Check side lengths, corner radii, thickness, and any fixing holes.

Fit & assembly

After disassembly, compare the contact pattern along the middle of the long sides with the areas near fasteners.

Use & inspection

Uneven flattening can indicate a cover or closing condition that should be corrected before replacement rather than hidden by adding thickness to the entire gasket.

Photos illustrate structure or material only. The gasket should match the opening and support area without being stretched to reach the corners. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.