Compressed molding different sizes rubber seal O-ring/washer

A rubber seal O-ring works with its groove and mating surface as a complete joint. When selecting among different sizes, the section diameter and the groove space are as important as the ring's overall diameter. Stretching a nearby size into place can alter its section and leave the joint with a different compression condition from the intended design.

Begin with the groove dimensions, the closing gap, and the surfaces that contact the seal. Identify whether the joint remains static or moves during operation, then select the rubber compound for the medium and temperature involved. A flat washer and a round section ring create different contact patterns, so they should not be substituted solely because their outer diameters match.

During installation, keep the ring free from twist and protect it from threads or sharp shoulders along the fitting route. Use an assembly aid only when compatible with the selected compound and the service medium. Close the joint evenly and inspect for pinching before operation.

For maintenance, investigate the location and shape of any damage. A cut near one edge may point to the installation route, while uneven flattening may indicate a closing gap problem. Replacing the seal with a harder or thicker part without resolving that geometry can introduce a different failure at the same joint.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Stretching a nearby size into place can alter its section and leave the joint with a different compression condition from the intended design.

Custom dimensions

When selecting among different sizes, the section diameter and the groove space are as important as the ring's overall diameter.

Fit & assembly

During installation, keep the ring free from twist and protect it from threads or sharp shoulders along the fitting route.

Use & inspection

For maintenance, investigate the location and shape of any damage.

Photos illustrate structure or material only. When selecting among different sizes, the section diameter and the groove space are as important as the ring's overall diameter. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.