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VARTM refers to a variety of related processes that represent the fastest growing new moulding technology

The salient difference between VARTM-type processes and standard RTM is thatin VARTM, resin is drawn into a preform through use of a vacuum rather than pumped in under pressure.  VARTM does not require high heat or pressure .In the VARTM process, fibre reinforcements are placed in a one-sided mould, and a cover (rigid or flexible) is placed over the top to form a vacuum-tight seal.

The resin typically enters the structure through strategically placed ports. It is drawn by vacuum through the reinforcements by means of a series of designed-in channels that facilitate wet-out of the fibres.

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