Custom made square rectangular large rubber gasket

A large rubber gasket with a square or rectangular outline can follow the perimeter of a matching cover or joint. Its sealing behavior depends on the mating faces and how compression is applied around that perimeter. Long straight sections and corners can be loaded unevenly if the cover or fastening pattern does not support them appropriately.

Define the inner opening, outer dimensions, corner shape and thickness together. A gasket that matches the overall width may still overlap an opening or miss a corner recess. Bolt holes and locating features, where included in the design, also need to register without stretching the rubber into position.

Lay the gasket on clean mating surfaces and check its entire outline before closing the joint. Tighten according to the assembly's intended procedure so compression remains distributed rather than concentrated near one fastener. Evaluate the completed joint for its actual sealing duty; size and rubber material alone do not establish a pressure rating. During removal, support long sections to avoid tearing a gasket that has adhered locally to the face.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Long straight sections and corners can be loaded unevenly if the cover or fastening pattern does not support them appropriately.

Custom dimensions

Define the inner opening, outer dimensions, corner shape and thickness together.

Fit & assembly

Tighten according to the assembly's intended procedure so compression remains distributed rather than concentrated near one fastener.

Use & inspection

During removal, support long sections to avoid tearing a gasket that has adhered locally to the face.

Photos illustrate structure or material only. A gasket that matches the overall width may still overlap an opening or miss a corner recess. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.