Pre-preg is a term for "pre-impregnated"
composite fibers where a matrix material, such as
epoxy, is already present. The fibers often take the form of a
weave and the matrix is used to bond them together and to other components during manufacture. The matrix is only partially cured to allow easy handling; this is called B-Stage material and requires cold storage to prevent complete curing. B-Stage pre-preg is always stored in cooled areas since heat accelerates complete polymerization. Hence, composite structures built of pre-pregs will mostly require an oven or
autoclave to cure.
