Silicone rubber band/ Custom rubber washer

A custom rubber washer creates a compliant interface between matching surfaces, with its inner opening and outer profile shaped around the assembly. Silicone rubber band configurations require a different fit assessment, so define the intended function before selecting dimensions. A ring used under compression between two faces is evaluated differently from a band held in tension around an object, even when the loose parts look similar.

For a washer used in a sealing arrangement, provide the dimensions of both mating faces and explain how they are brought together. The thickness controls the available compression, while the inside and outside dimensions determine where the rubber contacts the surrounding parts. Check whether a groove, shoulder or other feature keeps the ring in position during assembly. An unsupported edge can shift as the fastener or cover is tightened.

If the project instead requires a flexible band, describe the relaxed size and the installed size separately. ETOL can then review the proposed shape and compound against the amount of stretch and the frequency of removal. Material, hardness and color can be customized around the actual function, with the selected formulation assessed at the intended installed stretch.

Before approving a custom rubber washer, assemble a sample with the production mating components and examine the contact pattern after disassembly. Look for uneven compression, folding or rubber pushed beyond the intended seating area. Keep contacting surfaces clean, avoid dragging the ring across sharp threads, and discuss any exposure to liquids or cleaning agents before choosing the material. A drawing that labels the functional faces and the direction of force will make the quotation more useful than a diameter measurement alone. Confirm the final dimensions and material on the approved sample before ordering a production quantity.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Material, hardness and color can be customized around the actual function, with the selected formulation assessed at the intended installed stretch.

Custom dimensions

A custom rubber washer creates a compliant interface between matching surfaces, with its inner opening and outer profile shaped around the assembly.

Fit & assembly

Check whether a groove, shoulder or other feature keeps the ring in position during assembly.

Use & inspection

Keep contacting surfaces clean, avoid dragging the ring across sharp threads, and discuss any exposure to liquids or cleaning agents before choosing the material.

Photos illustrate structure or material only. The thickness controls the available compression, while the inside and outside dimensions determine where the rubber contacts the surrounding parts. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.