Custom (NBR) rubber seal plugs/special rubber stopper

A special rubber stopper can be custom molded for an opening that does not suit a standard plug. The profile should follow the receiving bore or recess, including any steps that determine the seating position. An NBR compound is selected for the actual substances and temperature involved.

Check the dimensions at the contact area rather than relying on the visible top outline. A special shape may need a particular orientation, insertion depth, or clearance from adjoining parts. The accessible portion should allow the intended removal method without forcing a tool into the sealing surface.

Fit the stopper into a clean, smooth opening and inspect for a lifted edge or premature contact with an internal shoulder. Do not use excess insertion force to compensate for an incompatible profile. During reuse, examine the rubber for swelling, cuts, or permanent distortion that changes its fit. The complete closure determines the required sealing performance, so a custom shape and NBR material name should not be treated as a universal pressure or fluid-compatibility specification.

Material options

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

Hardness selection

Solid rubber options: 30–90 Shore A. Do not use excess insertion force to compensate for an incompatible profile.

Custom geometry

A special shape may need a particular orientation, insertion depth, or clearance from adjoining parts.

Fit evaluation

Check the dimensions at the contact area rather than relying on the visible top outline.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. The profile should follow the receiving bore or recess, including any steps that determine the seating position. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.