Flexible FKM NBR rubber seal washers/square grey gasket

A square grey gasket can be customized for a sealing interface that uses a straight-sided outline. Its color may help identify the selected part within an assembly, while the material and geometry determine how it fits and works. NBR and FKM options should be treated as separate configurations rather than identified by grey color alone.

Match the inner opening, side lengths, corner radii, and thickness to the actual seat. The gasket should lie naturally before the joint closes, without being stretched into a corner or folded along an edge. The complete mating arrangement should provide the intended support and compression around the sealing path.

Select the compound for the actual medium and local temperature. During replacement, preserve that material specification as well as the visible shape. Clean the sealing surfaces and inspect areas where the old gasket shows concentrated damage. A correct grey outline cannot compensate for a defective seat or a different thickness that changes the final joint position.

Material options

NBR / FKM. Custom formulation and color for the intended contact conditions.

Hardness selection

Rubber: 30–90 Shore A. The gasket should lie naturally before the joint closes, without being stretched into a corner or folded along an edge.

Custom dimensions

Match the inner opening, side lengths, corner radii, and thickness to the actual seat.

Fit & assembly

A correct grey outline cannot compensate for a defective seat or a different thickness that changes the final joint position.

Use & inspection

Clean the sealing surfaces and inspect areas where the old gasket shows concentrated damage.

Photos illustrate structure or material only. The gasket should lie naturally before the joint closes, without being stretched into a corner or folded along an edge. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.