White Powder 97%min Potassium metabisulfite
1.>Name: Potassium metabisulfite
molecular formula: K2S2O5=222.326
molecular weight: 222.33
CAS Number: 16731-55-8
2.>Product characteristics
The Product was colorless crystal or white crystalline powder with the relative
density of 2.34 .
The melting point was 150-190oC(decomposition).
The product had a flavor of sulfur dioxide and soluble in water with acidic aqueous
solution.it was not soluble in ethanol.
3.>specification
Test item
| Unit | Specification | Test method |
K2S2O5 | g/100g | 97.2 | Acc.Fcc IV p.322 |
SO2 | g/100g | 56.0 | calculation |
K2S2O3 | g/100g | 0.1 | ISO 3629-1996(E) |
Na | g/100g | 2 | AAS |
Cl | g/kg | 0.5 | IC |
pH-value(10%solution) | - | 3.8-4.8 | RCA/Q-S-066 |
heavy metal(measured by Pb) | mg/kg | 10 | AAS |
As | mg/kg | 1 | AAS |
Cu | mg/kg | 1 | ICP-AES |
Fe | mg/kg | 5 | ICP-AES |
Hg | mg/kg | 0.1 | AAS(cold vapour) |
Pb | mg/kg | 1 | ICP-AES |
Se | mg/kg | 1 | AAS |
Zn | mg/kg | 1 | ICP-AES |
K2SO3 +K2SO4 | mg/kg | excess material | calculation |
4.>Product usage
The product was used for the preparation of photographic developing solution,
which was also used as food bleaching agents, preservatives, antioxidants.
In addition, it could be used to retain freshness of wine, fruit juice, beer clarifying
agent, fruits and vegetables, meat , grapes, as well as the non-cyanide silver plating.
5.>Packing
25kg per woven bag, linned with plastic bag,
or by user's request.
6.>Our Advantages
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