Buna-N rubber thin gasket/seal washer with special shape

A Buna-N rubber thin gasket can be custom formed around a nonstandard sealing path. Its outline may need to pass around openings or nearby features, leaving narrow sections that require careful support.

Define the relationship between each opening and the outer edge. A small positional mismatch can pull a narrow bridge out of shape even when the rest of the gasket appears aligned. Thickness should follow the designed closing gap rather than being chosen to make the loose component easier to handle.

Install the gasket without stretching one region to reach a locating feature. Check the narrow sections before the mating part covers them and guide that part into place without sideways dragging. Use the assembly's intended closing sequence to establish compression. During replacement, inspect the bridges and inner corners for tears that may be difficult to see on the broad face. Store unused shaped gaskets flat so that their less-supported portions remain ready to seat naturally.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Use the assembly's intended closing sequence to establish compression.

Custom dimensions

A small positional mismatch can pull a narrow bridge out of shape even when the rest of the gasket appears aligned.

Fit & assembly

Check the narrow sections before the mating part covers them and guide that part into place without sideways dragging.

Use & inspection

During replacement, inspect the bridges and inner corners for tears that may be difficult to see on the broad face.

Photos illustrate structure or material only. Thickness should follow the designed closing gap rather than being chosen to make the loose component easier to handle. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.