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This method is for determining silica and sodium, or sodium oxide, in water glass using a volumetric and gravimetric technique. The range of sodium ordinarily determined is 3 to 10%, and that of silica is 15 to 30%. Both sodium and silica may be determined at higher levels. The lower limit of detection for sodium is 0.02% and for silica 0.5%. Results are reported in mass-%.
ASTM UOP627-85, Silica and Sodium in Water Glass, ASTM International, West Conshohocken, PA, 2002, www.astm.orgBack to Top