Custom molded FDA silicone rubber screw plug

A silicone rubber screw plug should engage the receiving thread and reach its intended sealing position without being forced. The thread form, depth, and exposed handling feature need to suit the complete opening. For a food contact application, the selected formulation and finished plug must be assessed for the actual substance, temperature, and cleaning conditions.

Check where the closure retains and where it creates contact, since the thread itself may not be the only sealing feature. Leave clearance around the head so the plug can be removed without pulling a thin rubber edge sideways. Keep the receiving thread smooth and free of debris.

Start the plug squarely and stop if engagement is uneven. Inspect the contact region after repeated removal for cuts or permanent distortion. Follow the intended equipment fitting and care process, preserving the specified seating position. A different plug with a similar outside diameter should not be substituted without matching its complete thread and sealing geometry to the same opening.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. Start the plug squarely and stop if engagement is uneven.

Custom geometry

The thread form, depth, and exposed handling feature need to suit the complete opening.

Fit evaluation

Check where the closure retains and where it creates contact, since the thread itself may not be the only sealing feature.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. A different plug with a similar outside diameter should not be substituted without matching its complete thread and sealing geometry to the same opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.