special rubber seal plugs/dustproof (NBR) rubber covers

Special rubber seal plugs can be designed for a contact profile that does not suit a standard cylindrical stopper. The NBR cover or plug configuration should follow the actual receiving feature, including shoulders and changes in section. The selected compound needs to match the fluid, temperature, and cleaning exposure at that position.

Define where the part retains and where it seals, since those regions may be different. Check usable depth and access for removal after surrounding hardware is fitted. Avoid relying on a thin projection to carry the force required to extract a tightly seated closure.

Install with the intended orientation and keep the contact surfaces clean. Inspect for a folded region at any transition in the custom shape. During service, compare local damage with the receiving feature to identify sharp edges or uneven loading. Preserve the selected geometry and material during replacement rather than substituting an approximate shape that changes contact at one part of the closure.

Material options

NBR compound options, customized alongside the profile and contact conditions.

Hardness selection

Solid rubber options: 30–90 Shore A. Check usable depth and access for removal after surrounding hardware is fitted.

Custom geometry

The NBR cover or plug configuration should follow the actual receiving feature, including shoulders and changes in section.

Fit evaluation

Avoid relying on a thin projection to carry the force required to extract a tightly seated closure.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. Special rubber seal plugs can be designed for a contact profile that does not suit a standard cylindrical stopper. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.