Sodium Metabisulphite

– Product Identification
CAS No. : 7681-57-4
EINECS No. : 231-673-0
H.S. Code : 2832.1000
Formula : Na2S2O5
Molecular Weight : 190.10
Synonyms : Dinatriumdisulfit; Disulfito De Disodio; Disulfite De Disodium; Disodium Disulfite; Disodium Salt Pyrosulfurous Acid; Disulfurous Acid, Disodium Salt; Pyrosulfurous Acid, Disodium Salt; Sodium Metabisulfite; Sodium Disulfite; Sodium Pyrosulfite;

– Physical And Chemical Properties
Physical State : White or yellowish crystal powder
Melting Point : 150 C (Decomposes)
Specific Gravity : 1.48
Solubility in water : 54 g/100ml (20 oC); 81.7 g/100ml (100 oC)
NFPA Ratings : Health: 2; Flammability: 0; Reactivity: 0
Stability : Stable under ordinary conditions

– Applications
 Industrial Grade :
– Printing dyeing mordant, Dechlorinating agent for washed fabric.
– Medical deoxidizer and sulfonating agent.
– Bleaching agent of bamboo, wood and paper fiber.
– Non-ferrous mineral separation agent.
– Waste water disposing agent.
– Rubber coagulator.
– Alkyl spice aldehyde in spice industry.
– Depilating agent, softening agent and anti-wear agent in leather industry.
– Reducer of developer and protective agent of fixative in sensitization industry.
 Food Grade :
– Bleaching agent ( Sugar, Pastry, Water-soaked bamboo slices, Mushrooms, etc ).
– Loosening agent ( Bread, Biscuit, etc ).
– Corrosion Protection Antiseptic ( Fruit juice, Can, brewing, grain storage, etc ).
– Antioxidant and Fresh keeping agents ( Lily flower, Sea Food, Fruit, Vegetables, etc ).

– Specification
Testing Items / Quality Standard (Food Grade) / Quality Standard (Industrial Grade)
Purity – Na2S2O5 : 96.5% Min / 96.5% Min
Water Insoluble : 0.05% Max / 0.05% Max
Iron (Fe) : 0.003% Max / 0.005% Max
Arsenic (As) : 0.0001% Max / 0.0001% Max
Heavy Metal (Pb) : 0.0005% Max / –
Clarity : Pass / –

– Transportation
Storage : Store in a cool, dry, well-ventilated warehouse.
Packing : In 25kgs /50kgs /1000kgs net p.p. woven bags