Molded silicone o-ring extruded seals rubber strip o-ring

A silicone sealing strip uses a consistent extruded profile along its length, while a molded silicone O-ring provides a closed outline. Choosing between those formats should account for the joint where a length of profile meets its own end. The contact section may be similar, but the end arrangement becomes an additional part of the sealing path.

Match the cross section to the groove and available compression. Check corner radii and the route the profile must follow without kinking or changing shape. Select the silicone formulation for the actual medium and temperature at the joint.

Fit the length without stretching it to reach the final position, since recovery can leave an end gap. Keep cuts and any joining arrangement appropriate to the selected design. After closure, inspect for buckling or displacement from the seat. During maintenance, examine meeting ends alongside the rest of the contact path. A replacement length should restore the intended profile and end condition rather than simply fill the visible perimeter with an approximate piece of rubber.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Fit the length without stretching it to reach the final position, since recovery can leave an end gap.

Custom dimensions

Extruded seals use a consistent profile along a length, while a molded silicone ring provides a closed outline in its selected design.

Fit & assembly

After closure, inspect for buckling or displacement from the seat.

Use & inspection

A replacement length should restore the intended profile and end condition rather than simply fill the visible perimeter with an approximate piece of rubber.

Photos illustrate structure or material only. The contact section may be similar, but the end arrangement becomes an additional part of the sealing path. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.