What tonnage press for rubber parts?

It depends on mould area and pressure needed; small seal moulds run on 50–100 tonne presses, large moulds need more.

Electric or steam heating?

Electric heating is common in small workshops; steam suits large plants with a boiler.

Can the same press make rubber and bakelite parts?

Yes, with the right mould and temperature, as both are compression moulded.

Compression moulding press: rubber and composites

A compression moulding press is a hydraulic press with heated platens. Rubber, bakelite or composite material is placed in an open mould, the press closes and holds it under heat and pressure until the part cures. It is the most common machine in rubber parts workshops for seals, gaskets, bushes and mounts, and is also used for SMC, DMC and bakelite parts.

Quick facts

Type: Hydraulic press with heated platens
Tonnage: About 50–500 tonnes common
Platen size: About 300 × 300 mm (11.81 × 11.81 inch) to over 1 m square
Heating: Electric heaters, steam or oil, about 150–200 °C
Daylights: One to several openings
Typical parts: Rubber seals, gaskets, bushes; bakelite and SMC parts

Main parts

Hydraulic cylinder and power pack
Heated top and bottom platens with temperature control
Timer for cure time
Mould carrier or ejection system on bigger presses
Safety guards and two-hand controls

Good to know

Cure time depends on the rubber and part thickness
Platen temperature must be even for consistent parts
Vacuum presses reduce trapped air in thick parts
Transfer moulding needs a press with a transfer pot

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Questions

What tonnage press for rubber parts?: It depends on mould area and pressure needed; small seal moulds run on 50–100 tonne presses, large moulds need more.
Electric or steam heating?: Electric heating is common in small workshops; steam suits large plants with a boiler.
Can the same press make rubber and bakelite parts?: Yes, with the right mould and temperature, as both are compression moulded.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 29 October 2026.