Meta-Nitro Benzene Sulfonic Acid Sodium Salt Synonyms: MBS CAS No.: 127-68-4 EINECS No.: 204-857-3 Molecular formula: C6H4NNaO5S Molecular weight: 225.15 Appearance: white powder Content: 90% & 95% PH (1% solution): 7-9 Moisture: 3% max. Packing: 25kg/bag