Anhydrous sodium thiosulfate
Alias]: Sodium hyposulphite, baking soda, disodium thiosulphate, sea wave.
Properties】Colourless crystal or white powder, deliquescent in moist air, insoluble in alcohol, soluble in water.
High purity
| Test item High purity | High purity | Specified grade |
|
Content /% |
≥97.0 |
Customised according to customer requirements |
| Mesh |
20-100目 |
|
|
Insoluble matter content /% |
≥0.4 |
|
|
tter content /% ≥0.4 |
≤0.002 |
|
|
Iron(以Fe计) /% |
≤0.005 |
|
|
Free alkali (以NaOH计) /% |
≤0.06 |
|
|
Acidity (以H2SO4 计) /% |
≤0.01 |
|
|
Sulphide /% |
≤0.000 6 |
|
| pH value |
6.5-9.5 |
|
| Appearance of solution | Transparent without insoluble matter (except trace flocculent) |
Uses: Used as fixing agent in photographic industry; used as reducing agent of dichromate in leather tanning; neutraliser of nitrogen-containing exhaust gas; mordant; bleaching agent of wheat straw and wool; dechlorinating agent in pulp bleaching; intermediate of dyestuffs; extracting silver from ores.