Custom made silicone sealing O-ring/EPDM molded rubber washer

An EPDM molded rubber washer needs a supported face contact matched to its joint. A silicone sealing O-ring uses a different section and may be selected for different service conditions, so those parts should remain identified separately. Similar outside dimensions are not a sufficient basis for interchanging the two formats.

Check the washer thickness, central opening, and supported outer area. Select the compound for the actual medium, temperature, and cleaning exposure. For an O-ring position, define the groove and section dimensions instead of relying on the washer's face measurements.

Install the selected part without folds or twist and keep the contact path clean. Close the joint evenly and inspect for rubber displaced into an unsupported gap. During maintenance, compare the removed seal's damage with the mating hardware before choosing a replacement. Correct a surface or alignment issue where needed rather than switching materials or formats to hide a mechanical problem in the original joint.

Material options

EPDM / Silicone. Custom formulation and color for the intended contact conditions.

Hardness selection

Rubber: 30–90 Shore A. Silicone: 20–80 Shore A. Compare silicone and EPDM firmness in their respective O-ring or washer seats; correct misalignment before attributing uneven compression to the compound.

Custom dimensions

For an O-ring position, define the groove and section dimensions instead of relying on the washer's face measurements.

Fit & assembly

Check the washer thickness, central opening, and supported outer area.

Use & inspection

During maintenance, compare the removed seal's damage with the mating hardware before choosing a replacement.

Photos illustrate structure or material only. For an O-ring position, define the groove and section dimensions instead of relying on the washer's face measurements. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.