Both compression and injection molding form rubber under heat and pressure inside a tool. The difference is how the material gets into the cavity — and that difference drives cost, cycle time and tooling.
Compression molding
A measured blank of uncured rubber is placed into an open cavity and the press closes on it. Tooling is simpler and less expensive, which makes compression molding a strong choice for larger parts, lower volumes and thick sections such as soles, pads and gaskets.
Injection molding
Rubber is heated and injected into a closed tool. Cycle times are shorter and flash is reduced, so injection suits higher volumes and parts with tighter, repeatable geometry — at the cost of more complex tooling.
How we help you decide
We review the part geometry, annual volume, tolerance requirements and tooling budget together, and recommend the route that gives a consistent part at a sensible total cost.