Manufacturing process
Also known as vacuum infusion, VARI, VARTM
A variant of resin transfer moulding in which the upper mould is replaced by a vacuum bag and vacuum draws resin through the dry reinforcement. One tool surface makes very large parts affordable.
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With only one tool surface, vacuum infusion has low capital cost and can make large structures such as bridge sections and rail carriages, which is why it has replaced resin transfer moulding for some applications.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Department of Energy 2015 Primary authority
Vacuum infusion gives a poor surface finish on the bag side, is limited to nearly flat structures, takes time to prepare, holds poor dimensional tolerances and lacks automation.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Department of Energy 2015 Primary authority
Vacuum-assisted resin infusion modifies resin transfer moulding by replacing the upper mould tool with a vacuum bag, the vacuum drawing resin through the dry reinforcement, often helped by a permeable flow layer; variants include SCRIMP, resin infusion under flexible tooling and vacuum-assisted resin transfer moulding.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Department of Energy 2015 Primary authority
Record last updated 2026-10-30. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.