Sodium Metabisulphite CAS NO.7681-57-4

sodium metabisulphite - industrial / food grade

- 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

- other trade information
min. order quantity : 25mts
supply capacity : 22,000mts /year
loading capacity : 27mts/1080bags (1x20'fcl)
port of loading : huangpu / hengyang / tianjin, china
fresh stocks : yes
ref. price : usd305.- ~ usd320.-/mt fob huangpu / tianjin, china
shipment time : within 2-3 weeks upon receipt of advance payment or l/c .
payment terms : t/t, l/c ( sight / 90days ), d/p,
origin : hunan, tianjin
sample availability : yes
main export markets : south africa, thailand, myanmar, pakistan, lebanon, turkey, iran, spain