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ASA IMPEX is a manufacturer, exporter of Sodium Metabisulfite which has the CAS Number 7681-57-4 and Molecular Weight 190.11 g/mol. Its chemical formula is Na2S2O5. We are operating from Delhi and are meeting the demands of national as well as international clients. These are offered in various brands such as ASA, Lotus and Swastik. This is available in powder form and is generally packed in 50KG HDPE bags. It is used as a food additive, food preservative agent and an antioxidant. Further, Sodium Metabisulfite is used for leather tanning process, rubber industry, effluent treatment plant and water treatment plant.