Butyl Pharmaceutical Rubber Plug Stopper

A butyl rubber bung for pharmaceutical packaging is developed as part of a specific container closure system. Dimensions, color and compound details can be tailored to the intended design. Selection must consider the plug and container together rather than treating the loose stopper as a universally suitable closure.

Compare the container opening, seating surface and intended retention arrangement. The plug should reach its defined position without folding an edge or contacting an internal feature prematurely. The exposed portion also needs to work with the equipment used to place or remove the closure.

For a pharmaceutical application, the selected formulation, contents and processing conditions must be compatible. Cleaning, sterilization and storage conditions belong to that evaluation where they apply. Suitability for a particular pharmaceutical use requires assessment of the complete system, including closure integrity and contact with the intended contents; a generic material name is insufficient.

Keep parts protected from contamination throughout handling and assembly. Do not mix versions that share a color but use different formulations or dimensions. Inspect fitted closures for uneven seating and damage before they enter the intended process. Any change to the container neck or plug compound should be assessed as a change to the closure system rather than assumed equivalent because the outside appearance remains similar.

Material options

Butyl rubber compound options, customized alongside the profile and contact conditions.

Hardness selection

Solid rubber options: 30–90 Shore A. Compare the container opening, seating surface and intended retention arrangement.

Custom geometry

Do not mix versions that share a color but use different formulations or dimensions.

Fit evaluation

Inspect fitted closures for uneven seating and damage before they enter the intended process.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. The plug should reach its defined position without folding an edge or contacting an internal feature prematurely. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.