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