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The manufacturing process of composite panels is usually referred to as a "layup". A "wet" layup involves laying sheets of carbon fibre or fibreglass onto a surface, applying epoxy resin, and curing the soaked composite under a vacuum seal. This process is known as "vacuum bagging", because the film used to seal the vacuum is pressed against the panel by the ambient air pressure. A more advanced process involved involves using carbon fibre which has already been "impregnated" with resin, called "prepreg", which must be stored in a freezer to prevent the resin from curing before use. Once the material is removed it must be applied within a certain time and cured in an industrial oven or autoclave (pressure chamber).
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