Metabisulfite
Sodium disulfite (13459)
dry, extra pure, meets analytical specification of Ph. Eur., BP, NF, FCC, E 223, assay 97.0 - 100.5%
Overview
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Specifications
General Information
- Molar Mass
- 190.11 g/mol
- CAS Number
- 7681-57-4
- Linear Formula
- Na2O5S2
- Grade
- Extra pure
Physical Properties
- Boiling Point/Range
- Decomposes on heating.
- Odor
- Stinging
- Color
- Colorless
- Physical Form
- Crystalline powder
- Density
- 2.36 g/cm3 (20 °C)
- pH
- 3.5 to 5.0 at 50 g/l (20 °C)
- Vapor Pressure
- Negligible hectopascal
- Melting Point/Range
- > 150 °C (Decomposes without melting)
Safety Information
- Incompatible Materials
- Oxidizing agents, Contact with strong acids liberates sulphur dioxide
- Flammability
- The product is not flammable.
- Chemical Stability
- Stable under recommended storage conditions.
- Thermal Decomposition
- Decomposes without melting.
- Self Ignition
- Not auto-flammable
International Transportation
- Harmonized System Code
- 2832100000
General Information
- Molar Mass
- 190.11 g/mol
- CAS Number
- 7681-57-4
- Linear Formula
- Na2O5S2
- Grade
- Extra pure
Physical Properties
- Boiling Point/Range
- Decomposes on heating.
- Odor
- Stinging
- Color
- Colorless
- Physical Form
- Crystalline powder
- Density
- 2.36 g/cm3 (20 °C)
- pH
- 3.5 to 5.0 at 50 g/l (20 °C)
- Vapor Pressure
- Negligible hectopascal
- Melting Point/Range
- > 150 °C (Decomposes without melting)
Safety Information
- Incompatible Materials
- Oxidizing agents, Contact with strong acids liberates sulphur dioxide
- Flammability
- The product is not flammable.
- Chemical Stability
- Stable under recommended storage conditions.
- Thermal Decomposition
- Decomposes without melting.
- Self Ignition
- Not auto-flammable
International Transportation
- Harmonized System Code
- 2832100000
- Molar Mass : 190.11 g/mol
- CAS Number : 7681-57-4
- Linear Formula : Na2O5S2
- Grade : Extra pure
- Boiling Point/Range : Decomposes on heating.
- Odor : Stinging
- Color : Colorless
- Physical Form : Crystalline powder
- Density : 2.36 g/cm3 (20 °C)
- pH : 3.5 to 5.0 at 50 g/l (20 °C)
- Vapor Pressure : Negligible hectopascal
- Melting Point/Range : > 150 °C (Decomposes without melting)
- Incompatible Materials : Oxidizing agents, Contact with strong acids liberates sulphur dioxide
- Flammability : The product is not flammable.
- Chemical Stability : Stable under recommended storage conditions.
- Thermal Decomposition : Decomposes without melting.
- Self Ignition : Not auto-flammable
- Harmonized System Code : 2832100000
Property
Value
assay
97.0 - 100.5 %
assay of sulfur dioxide
65.0 - 67.4 %
pH (5 %, 20°C)
3.5 - 5.0
pH (10% solution)
4.0 - 5.0
arsenic (As)
Max. 2 ppm
copper (Cu)
Max. 0.001 %
iron (Fe)
Max. 10 ppm
mercury (Hg)
Max. 1 ppm
lead (Pb)
Max. 2 ppm
selenium (Se)
Max. 5 ppm
zinc (Zn)
Max. 0.001 %
heavy metals (as Pb)
Max. 10 ppm
chloride (Cl)
Max. 0.01 %
thiosulfate (S2O3)
Max. 0.02 %
thiosulfate (S2O3)
complying
appearance of the solution
complying
residual solvents
complying
