Sodium Metabisulfite tech grade

Brief Description
CAS No.: 7681-57-4 Other Names: Sodium Pyrobisulfite MF: Na2S2O5
EINECS No.: 231-673-0 Place of Origin: Hunan China (Mainland) Main Raw Material: sodium metabisulphite
Usage: Appliance Paint, Building Coating Application Method: Brush State: Powder Coating
Brand Name: BOYA color: white powder purity: 97%
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
Delivery Terms & Packaging
Packaging Detail:25 kg bag, 50 kg bag, 1000 kg bag or as per customer 's request.
Delivery Detail:15 days
Specifications
Sodium Metabisulfite tech grade

A major manufacturer of Sodium Metabisulphite
20 years experience of exporting
certificated by ISO 9001
high purity

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.