Light RTM (LRTM – light resin transfer moulding) is a variant of RTM (resin transfer moulding) in which dry fibres are impregnated with resin in a closed composite or aluminium mould: the cavity is evacuated with vacuum and the resin is fed from a pressure pot at positive pressure, usually 1–4 bar.
Composite and aluminium moulds are cheaper than steel ones, so the process pays off in series from about a hundred to several thousand parts a year. Both surfaces of the part replicate the mould.
Read more: RTM and light RTM (LRTM).