A substantially white powder for use as a filler and extender derived from by products of manufacturing vitreous low alkali, low iron glass fibers, and {HEAD ~ a method} for producing {TAIL ~ the powder} 
for producing
A substantially white powder for use as a filler and extender derived from by products of manufacturing vitreous low alkali , low iron glass fibers , and { HEAD ~ a method } for producing { TAIL ~ the powder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL