97% Sodium pyrosulfite(Na2S2O5) solid

Sodium pyrosulfite Dyeing texitile water treatment Packaged in woven bag,each containing 25kgs or 1000kgs CAS NO 7681-57-4

Sodium Metabisulfite (SMBS)

Molecular Formula: Na2S2O5Molecular Weight: 190.10 CAS NO: 7681-57-4H.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.

   

97% Sodium pyrosulfite(Na2S2O5) solid