This International Standard establishes a basis for the specification of the Polyester moulding compounds BMC (bulk moulding compound) and DMC (dough moulding compound) with or without thickening agents. BMC and DMC are different types of preimpregnated product used for the production, by moulding, of various Parts made of composite materials. This Standard only considers BMC and DMC in which textile glass is the sole (or main) reinforcement.