Resin infusion

A variant of resin transfer moulding in which resin is drawn into dry reinforcement under vacuum, typically with a rigid mould face on one side and a flexible film or light shell on the other. The term is often used interchangeably with resin infusion, particularly in North American literature.

An open mesh layer placed over or within a dry fibre stack during resin infusion to create a fast path for resin to spread across the part before wetting through the thickness. It is normally removed together with the peel ply after cure.

A sacrificial woven fabric laminated onto the surface of a laminate and torn off after cure, leaving a clean, uniformly textured surface ready for bonding or painting. Release-coated variants can transfer contamination and are generally avoided where structural bonding will follow.

A vessel placed in the vacuum line between the mould and the pump during infusion or wet bagging to intercept surplus resin before it can reach and damage the vacuum pump.

The removal of dissolved and entrained air from mixed liquid resin, usually by holding it under vacuum until bubbling subsides, before infusion or casting. Degassing reduces void formation and is particularly important for clear castings and high-performance infusions.

A consolidation technique in which a laminate is sealed under a flexible airtight film and the air is evacuated so that atmospheric pressure compacts the plies during cure. It removes trapped air and excess resin and is used with wet lay-up, prepreg and infusion processes.