High quality Oil-proof Buna-N rubber seal stoppers/plugs

Buna-N rubber seal stoppers close openings with a molded body selected for the receiving feature. The custom dimensions can define the seating diameter, insertion depth, and accessible top. For an oil-contact application, the compound needs to be matched to the particular fluid rather than treated as universally oil-proof.

Consider the oil formulation, temperature, and duration of contact. Incidental splashing and continuous immersion can place different demands on the rubber. The mechanical fit also needs to suit the opening, including any taper or internal step that changes the contact area.

Fit the stopper into a clean, smooth bore and inspect its position without forcing it beyond the intended depth. Leave the required access for removal and avoid using a sharp tool against the sealing body. During reuse, check for swelling, cracking, or permanent deformation that could change the fit. The complete closure must suit its operating conditions, and a material choice alone does not establish pressure retention or a guaranteed seal for every receiving part.

Material options

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

Hardness selection

Solid rubber options: 30–90 Shore A. Leave the required access for removal and avoid using a sharp tool against the sealing body.

Custom geometry

The custom dimensions can define the seating diameter, insertion depth, and accessible top.

Fit evaluation

Consider the oil formulation, temperature, and duration of contact.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. The custom dimensions can define the seating diameter, insertion depth, and accessible top. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.