A composite molding process with two counter molds (male and female). Typically, the two mold parts are joined, clamped by vacuum, and resin is injected into the mold cavity assisted by vacuum. The male mold can be flexible or rigid. It is flexible when a foil or silicon bag is used as a male mould and rigid when a FRP or metal male mold is used. Typical flexible male mould processes is the vacuum infusion process and a typical rigid male mould process is RTM (Resin Transfer Moulding)

Parts manufactured in closed mould processes can be fairly simple, flat shapes, or more complex shapes, such as complete decks for a recreational boat.

Lantor products for closed mould processes: