25-cavity Rubber Plug Mold

25-cavity rubber plug mold is a precision compression mold for producing rubber sealing plugs, stoppers, and bungs in a 5×5 cavity grid. The square die plate with two side handles is designed for easy handling in a rubber compression press.

Cavity Layout

Twenty-five identical cylindrical cavities are arranged in a neat 5×5 matrix on the die face. Each cavity forms one rubber plug or stopper. The cavities are vented to allow trapped air to escape during molding. Ejector pins push the cured plugs out of each cavity.

Construction

• Hardened tool steel plate with precision-machined cavities.

• Two side handles for die handling and alignment.

• Guide pins for accurate upper/lower die matching.

• Heating plates for vulcanization temperature control.

• Vents for air escape during mold closing.

Rubber Molding Process

A pre-weighed rubber blank is placed in each cavity. The press closes the mold, and heat (typically 150–170 °C) and pressure vulcanize the rubber into the cavity shape. After cure (typically 3–10 minutes), the mold opens and the 25 plugs are ejected simultaneously.

Applications

Rubber plugs and stoppers are used in pharmaceutical bottles, laboratory glassware, industrial pipes, electrical cable glands, and automotive fluid reservoirs. The multi-cavity design produces high volumes at low cost per piece.

Conclusion

The 25-cavity rubber plug mold is an efficient tool for mass production of rubber stoppers. The balanced 5×5 layout ensures uniform material flow and consistent part quality across all cavities.