Chemical name: sodium hydroxide (caustic soda; caustic soda; caustic soda)
English name: Sodium hydroxide
CAS NO: 1310-73-2
Molecular formula: NaOH Molecular weight: 40
Physical and chemical properties:
Characters Pure products are colorless and transparent crystals.
Melting point 318.4οC
Boiling point 1390οC
Relative density 2.130
Solubility is easily soluble in water and is strongly exothermic. It is soluble in ethanol and glycerin; it is insoluble in acetone and ether. The dew is placed in the air and will eventually dissolve completely into a solution.
Uses: Basic chemical raw materials, widely used in chemical, metallurgical, paper, petroleum, textile and daily chemical industries.
Solid alkali quality standard：GB209-93
| Indicator name/level | Ion-membrane solid base | |
| Superior grade | First grade | |
| Sodium hydroxide NAOH %≥ | 99.5 | 99.0 |
| Sodium carbonate NA2CO3 %≤ | 0.45 | 0.45 |
| Sodium chloride NACI %≤ | 0.03 | 0.05 |
| Ferric oxide FE2O3 %≤ | 0.004 | 0.006 |
Flaky caustic soda quality standard：
| Indicator name/level | Ion membrane method |
| Sodium hydroxide NAOH %≥ | 99 |
| Sodium carbonate NA2CO3 %≤ | 1.0 |
| Sodium chloride NACI %≤ | 0.3 |
| Ferric oxide FE2O3 %≤ | 0.01 |