a method for recycling glass mat waste , wound rovings , and other products includes providing a source of glass mat , or a plurality of rovings , for example on a roll , and routing the glass mat or rovings into a submerged combustion melter . an unwind system and a pair of powered nip rolls , powered conveyors , or other arrangement may work in combination to provide a substantially consistent rate of material into the melter . the melter may operate under less than atmospheric pressure to avoid fumes escaping the melter . a slot in the melter allows ingress of the glass mat or rovings into the melter , and a glass mat former such as a folder may be used to ensure that the mat fits through the slot . alternatively , the glass mat may be cut by a slitter prior to entering the slot .