| http://www.w3.org/ns/prov#value | - 0 - 0.5% Al2 O3 and 0 - 0.5% Mx Oy wherein R is an alkaline earth metal, M is a metal other than an alkaline...http://www.google.com/patents/US4140533?utm_source=gb-gplus-sharePatent US4140533 - Alkali resistant glass compositions and alkali resistant glass fibers prepared therefromAdvanced Patent SearchPublication numberUS4140533 APublication typeGrantApplication numberUS 05/856,991Publication d
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