|
Physical and Chemical Properties
|
Physical State
|
White or slightly
yellow crystal powder
|
Melting Point
|
150 °C
|
Specific Gravity
(H2O=1)
|
1.4
|
Solubility in
Water
|
45% in water at 20 C
|
Decomposition
temperature
|
Approx 150 C
|
PH
|
4.5 (1% solution)
|
|
|
|
Applications
|
|
Reducing
agent for chemical manufacturing. Preservative. Auxiliary for water
treatment film and photographic industry. Bleaching agent. Ensiling
agent.
|
|
Sales Specification
|
Photo Grade and Food Grade
|
|
Appearance
|
White or slightly yellow
crystal powder
|
|
Assay (Na2S2O5)
|
97% Min
|
|
Insoluble in water
|
0.03% Max
|
|
Iron
|
0.003% Max
|
|
PH
|
4.0-4.6
|
|
|
|
|
|
