Rectangle Silicone Flat Gasket/ Rubber Foam Gasket

A rectangle silicone flat gasket provides a shaped contact between mating surfaces. A foam version should be chosen around the closed gap and the support available along the rectangular boundary. Custom dimensions and material details allow the part to follow the assembly rather than rely on a general sheet thickness alone.

Measure the space when the mating parts reach their intended position. Foam compression can make the working thickness quite different from the free thickness, and the gasket must have enough room to deform without being pushed out of the joint. Keep the long sides and corner regions supported on the sealing land.

Fit the gasket without pulling it diagonally to align holes or corners. Bring the mating faces together in the intended manner and inspect for a trapped or folded edge. Select the silicone and foam construction for the actual temperature, contact and cleaning conditions. During servicing, compare the compressed shape with the original fit. Persistent flattening or local damage may indicate excessive loading or uneven support that should be corrected before another gasket is installed.

Material options

Silicone and foam rubber options, with the rectangular outline and material structure specified for your joint.

Hardness selection

For the foam version, 35–45 Shore C provides an intermediate selection reference. Softer 20–30 Shore C options require review of corner support and the closed gap. Solid silicone: 20–80 Shore A.

Custom dimensions

Set the rectangle, openings and thickness around the supported sealing land; keep the long sides located as the gap closes.

Fit & assembly

Do not pull the gasket diagonally to reach the corners. Check for folds when the mating faces meet.

Use & inspection

Compare flattening along the straight sides with the corners during servicing; resolve uneven support before fitting another gasket.

Photos illustrate structure or material only. A foam version should be chosen around the closed gap and the support available along the rectangular boundary. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.