POTASSIUM METABISULPHITE
POTASSIUM METABISULPHITE Extra Pure
Short Name: POTASSIUM METABISULPHITE
Synonym: Potassium pyrosulfite; Dipotassium disulfite
Basic Details
Article No.
LG3737
Grade
Extra Pure
Purity
95%
CAS No.
16731-55-8
HS Code
2832.2010
Shelf Life
60 Months
Packings Avialable
Physical Properties
Physical state at 20 °C
Solid
Colour
White crystalline
Odour
Odorless
pH value
3-4.5 at 22.2 g/l at 25 °C
Melting point/ Freezing point [°C]
150°C
Decomposition point [°C]
150°C
Vapour density
2.3
Density [g/cm3]
2.34
Solubility in water [% weight]
22.2 g/l at 20 °C
Chemical Specifications
Appearance
White crystalline powder
Assay (iodometric)
95 - 99.9%
Iodometric,SO2
54.8 - 57.6%
Appearance of solution
Passes test
pH (5% solution in water)
3 - 4.5
Chloride (Cl)
Max 0.05%
Heavy metal (as Pb)
Max 0.001%
Thiosulphate
Passes test
Copper (Cu)
Max 0.0025%
Zinc (Zn)
Max 0.0025%
Iron (Fe)
Max 0.002%
Selenium (Se)
Max 0.0005%
Mercury (Hg)
Max 0.0001%
Safety Information & Hazard Symbols
Symbol
GHS07
Signal Word
Warning
Hazardous Statement
H315-H319-H335
Precaution Statement
P261-P305 + P351 + P338