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Sodium Metabisulfite
MF: Na2S2O5       
MOLECULAR WEIGHT: 190.09    
CAS NO.:7681-57-4         
EINECS NO.:1-673-0
MELTING POINT:>300℃                                     DENSITY:1.48                    


Feature:
Sodium metabisulfite is white or yellow crystalline powder or small crystals.With a strong smell of the proportion of SO2, 1.4, soluble in water, an acidic aqueous solution, contact with strong acids are released SO2 and generates the corresponding salts, long in the air, is oxidized into Na2S2O6, so the product can not be stored for a long time. More than 150 degrees Celsius, which is decomposed SO2.
          
Application:
The industrial grade sodium metabisulfite
Main uses: Dyeing mordant, dechlorinating agent for washed fabric, medical deoxidizer and sulfonating agent, bone black for bamboo, wood and paper fiber, non-ferrous mineral separation agent, waste water disposing agent, rubber coagulator.
The food grade sodium metabisulfite

Main uses:
Bleaching agent(for sugar, pastry, dried slices of tender bamboo shoots,etc ), loosening agent(for bread, biscuit, etc ), corrosion protection antiseptic(fruit juice, can,etc ), antioxidant(for lily flower, sea food, fruit, vetegable,etc )
packing: external polypropylene woven bag, polyethylene plastic bag lining.

Storage:
Storage should be to prevent breakage, moisture, heat metamorphism. With no oxidant, acid coexistence

Packing:
external polypropylene woven bag, polyethylene plastic bag lining.

Net weight:
25kg /bag 50kg /bag 1000kg/bag

Index:
         

         Sodium metabisulfite for food grade

Item

Chinese standard
GB1893-2008

Company standard

Main content(Na2S2O5)

≥96.5

≥97.5

Fe(As content Fe)

≤0.003

≤0.0015

Clarity

Pass test

Clear

Heavy metal content (Pb)

≤0.0005

≤0.0002

Arsenic content (As)

≤0.0001

≤0.0001

 

                              Sodium metabisulfite for industrial grade

Item

Chinese standard
HG/T2826-2008

Company standard

Top-grade

First grade

Main content(Na2S2O5)

96.5

95.0

97.0

Fe %( Fe)

0.005

0.01

0.002

Water-Insoluble

0.05

0.05

0.02

Arsenic(As) content

0.0001

0.0001

0.0001