钠Metabisulphite

Sodium Metabisulfite (SMBS) Molecular Formula: Na2S2O5 Molecular Weight: 190.10 CAS NO: 7681-57-4 H.S. code: 2832100000 Specification Content (NA2S2O5) 97% min SO2 65% min Fe 0.003% max Heavy metal (Pb) 0.001% max As 0.0002% max Ph 4-6 Water in soluble matter: 0.05% max Packing: In plastic woven bag lined with food-grade PE bag. Net wt. 25kgs, 50kgs, 1000kgs. Packing bags should be labeled such signs as "Food-additive Sodium Metabisulfite" and "Prevent Moisture and Heat". Storage & Protection: Should be stored in dry and cool place; avoid dampness and heat; maintain the integrity of packing. No mixing with oxidants and toxic articles. Shelf life is 6 months. Conveyance viechles should be clean with cover to prevent rain. Properties: It is white or yellowish crystalline powder, relative density: 1.4; soluble in water(20°C 54g/100ml of water; 100°C 81.7g/100ml of water). Aqueous solution is acid; soluble in glycerin, slightly soluble in ethanol. Will be decomposed in humid conditions, and oxidized into sodium sulfate in open air; will release sulfur dioxide when contacting strong acids; will be decomposed at 150°C. Use: In the manufacture of chloroform, solasulfone and benzaldehyde; as coagulator in rubber industry; as dechlorinating agent and cooking auxiliary in cotton fabrics; used in leather treatment in tanner industry; in the manufacture of hydroxycitronellal and hydroxylamine; as developer; as bleaching agent, preservative, anti-oxidant in food industry. As per GB2760-86, use level for fruit wine is 0.25g/kg max.; for wine, sugar, bamboo shoot is 0.45g/kg max.; Residues(SO2) in bamboo shoot and mushroom: 0.025g/kg max.; in fruit wine and sugar: 0.05g/kg; for others: 0.1g/kg max.