Molded square rubber insulative gaskets/rubber seal washer

Square rubber insulative gaskets place a shaped rubber layer between square or rectangular mating features. Their corners and fastening openings need to align without stretching, because distortion can uncover the very edge the gasket is meant to separate. A square outline also needs enough space to remain contained as the joint is compressed.

Choose the outer dimensions, central opening, and thickness around the finished assembly. Check corner radii on both mating parts rather than assuming a sharp square shape throughout. Any required insulating function depends on the selected compound and the complete arrangement, including fasteners and surrounding clearances.

Set the gasket flat before bringing the faces together. Tighten evenly so one corner does not become a pivot while the opposite side closes. Inspect the exposed edge for bulging or displacement, especially beside a bolt hole. If the joint is reopened, check for a crease or cut that could interrupt the separating layer. Preserve the designed thickness when replacing the gasket so the assembly returns to its intended closing position.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. A square outline also needs enough space to remain contained as the joint is compressed.

Custom dimensions

Choose the outer dimensions, central opening, and thickness around the finished assembly.

Fit & assembly

Any required insulating function depends on the selected compound and the complete arrangement, including fasteners and surrounding clearances.

Use & inspection

Inspect the exposed edge for bulging or displacement, especially beside a bolt hole.

Photos illustrate structure or material only. A square outline also needs enough space to remain contained as the joint is compressed. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.