Toxicological summary for sodium metasilicate [6834-92-0] and its 01/2002 pentahydrate [10213-79-3] and nonahydrate [13517-24-3] i Executive Summary Basis for Nomination Sodium metasilicate was nominated for subchronic inhalation toxicity testing based on the large number of individuals occupationally exposed to the compound, evidence for biological activity, and the gaps in available toxicity ...