Is Compression Molding the "simplest" way to make rubber gaskets?

Compression Molding

Compression molding is accomplished in a compression press consisting of a top and bottom platen that are forced together via a hydraulic cylinder or ram. In this process, an operator places a rubber preform in an open, heated mold, most often made up of a top and bottom plate containing the part geometry. The mold is closed in the press and the press compresses the mold and forces the rubber to conform to the shape of the mold cavities. Heat and pressure are maintained until the rubber has vulcanized to create the final product.

The advantage of compression molding is its ability to mold relatively simple parts with comparatively low mold and equipment costs and fast setup times. Compression molding is one of the lowest-cost molding methods with regard to tooling and equipment.

However, compression molding is primarily limited to compact parts with generally simple geometries. Also, production costs can climb higher due to slower cycle times and the need to utilize an excess of raw material to assure the part is complete.

Rubber material compressed inside a compression press

To learn more about the different types of processes used to mold rubber gaskets and seals, including injection molding and transfer molding, download our free white paper.

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ManufacturingSamMarch 21, 2023