NBR FKM rubber flat gaskets/molded round rubber washers

Custom round rubber washers can be molded in NBR or FKM for a flat gasket interface. The inner diameter provides clearance around the central feature, while the outer ring needs support from the mating faces. These dimensions should be chosen together with thickness to establish the intended contact area.

Check the central opening after the washer is positioned. It should not be stretched over an oversized feature or displaced as adjoining hardware is assembled. At the outer edge, confirm that the rubber is not left spanning a gap where compression can push it out of place.

Choose the finished formulation for the medium and operating temperature. Before fitting, clean the faces and remove debris that could produce a local high spot. During maintenance, examine the washer for cuts at the inner edge and uneven flattening around the ring. A replacement should preserve the working dimensions and compound requirements, even when several round washers appear similar from the outside. Correct support issues if the same edge repeatedly becomes damaged.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. At the outer edge, confirm that the rubber is not left spanning a gap where compression can push it out of place.

Custom dimensions

The inner diameter provides clearance around the central feature, while the outer ring needs support from the mating faces.

Fit & assembly

Correct support issues if the same edge repeatedly becomes damaged.

Use & inspection

Before fitting, clean the faces and remove debris that could produce a local high spot.

Photos illustrate structure or material only. The inner diameter provides clearance around the central feature, while the outer ring needs support from the mating faces. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.