Lite-RTM is used where lower volumes are involved, and may not justify the expense of heavy duty tooling required for RTM.
Pressure is a major difference between RTM and Lite-RTM processes. RTM is when the pressure in the mould is higher than atmospheric pressure. Lite-RTM is when the pressure in the mould is lower than atmospheric pressure.
The top mould used in Lite-RTM is not made of the same heavy duty material as RTM. Fibreglass laminates may be used.