Potassium Metabisulfite
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Synonyms: Potassium metabisulphite; Potassium metabisulfite; Potassium pyrosulfite; Potassium pyrosulphite;
potassium disulfite
Molecular formula: K2S2O5
Molecular weight: 222.326
CAS : 16731-55-8 H.S.Code:28322000
Properties:White crystals with strong sulphur dioxide smell, soluble in water, In aqueous solution, it is in the form of potassium bisulfite (KHSO3), which exerts a strong reducing effect. Solutions of this nature are rapidly oxidized on standing in air.
FOOD GRADE / REAGENT GRADE
|
Items |
Specifications |
||
|
Unit |
Food grade E224 / FCC |
Reagent grade |
|
|
Purity [ K2S2O5 ] |
g/100 g |
97.2 min. |
98.0 min. |
|
SO2 |
g/100 g |
56.0 min. |
— |
|
K2S2O3 |
g/100 g |
0.1 max. |
— |
|
Na |
g/100 g |
2 max. |
— |
|
Cl- |
g / kg |
0.5 max. |
0.005 max. |
|
PH value [ 10 solution ] |
— |
3.8 - 4.8 |
— |
|
Heavy metal [ as per Pb ] |
mg / kg |
10 max. |
10 max. |
|
As |
mg / kg |
1 max. |
1 max. |
|
Cu |
mg / kg |
1 max. |
— |
|
Fe |
mg / kg |
5 max. |
5 max. |
|
Hg |
mg / kg |
0.1 max. |
— |
|
Pb |
mg / kg |
1 max. |
— |
|
Se |
mg / kg |
1 max. |
— |
|
Zn |
mg / kg |
1 max. |
— |
|
K2SO3 + K2SO4 |
— |
remainder |
— |
Note: special specifications are available for customers with special requirements
Application: Mainly used in foodstuffs industry as a preservative , for the treatment of wine after fermentation has ended. for the removal of moulds from freshly selected grapes before pressing. also used in pharmaceutic materials, photochem, bleaching, etc.
Packing: In kraft paper bags / LDPE bags of 25 kgs net, or in 1 kg Aluminium foil bags / 2.5 kgs bottles etc.
Transportation & storage: It can not be exposured in open air or under the sunlight, must be stored under ventilating, drying, never mix stored with gasoline, acids, oxidants and other inflammable substances etc.