Patent ID: 7823417

Claim:
A process for producing glass fibers from raw glass batch in a refractory lined glass melter, the process comprising the steps of: charging raw glass batch to the melting zone of the glass melter, the glass batch comprising: about 60.5 to about 70.5 weight percent SiO 2 ; about 10 to about 24.5 weight percent Al 2 O 3 ; about 15.0 to about 20.0 weight percent RO, where RO equals the sum of MgO, CaO, SrO and BaO in the batch composition, 5 to 11.33 weight percent of the RO being MgO; and about 0 to about 3 weight percent alkali metal oxides; heating the glass batch to a forming temperature in excess of the liquidus temperature of a resulting glass to form a fiberizable molten glass; and fiberizing said molten glass.