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POTASSIUM METABISULPHITE Extra Pure

Potassium pyrosulfite; Dipotassium disulfite

COAs

Packings

500 g (00500)

5000 g (05000)

25 Kg (0025K)

50 Kg (0050K)

1PW1200500 1PW1206500 1PDL00030K 1PDL00040K
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Article No. 05394 Grade Extra Pure
Purity 95% CAS No. 16731-55-8
Molecular Formula K2S2O5 Molecular Weight 222.31
H.S. Code 2832.2010 Shelf Life 60 Months

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

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%
Arsenic (As) Max 0.0002% Mercury (Hg) Max 0.0001%

Safety Information and Hazard Symbols

Exclamation Mark
Symbol: GHS07
 Signal Word: Warning
 Hazardous Statement: H315-H319-H335
 Precaution Statement: P261-P305 + P351 + P338
Revision Date: 13-Dec-2013

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