Vacuum Bagging Films are used to seal the whole of the composite laminate, including the other vacuum consumables, to the tooling surface. A vacuum is then applied in order to apply atmospheric pressure to the component.This pressure can be increased in an autoclave, or maintained for a standard, one-atmosphere cure cycle at the chosen cure temperature.

Due to bagging film’s good temperature resistance, cost-effectiveness, ease of use and low air permeability (necessary to achieve a good quality laminate and vacuum integrity). Nylon films are susceptible to variations in humidity, since moisture is used as a natural plasticizer.