Sodium sulfite of photo grade
Description: CC FEA 2832 10 0000
Anhydrous sodium sulfite (sodium sulphite) is derived from crystallization of concentrated sulfite liquor or from dehydrating of crystalline sodium sulfite.
In accordance with TC BY 400069905.031-2006 (as per GOST 5644-75) sodium sulfite is produced in two grades: photographic (first grade) and technical one.
Identified use:
• leather industry (for tanning);
• pharmaceutical industry (manufacture of synthetic odorants);
• chemical industry (in manufacture of iodine, chlorine, caustic soda, viscose rayon fiber, synthetic detergents and chemical crop protection agents);
• textile industry (cotton fabric dyeing);
• pulp-and-paper industry (for enhancement of pulp resilience);
• flotation of nonferrous metal ores, chromiferous effluents neutralization, makeup demineralizer.
Specifications
№ | Characteristics | Unit | Standard | |
Higher grade | First grade | |||
1 | Appearance | White powder | ||
2 | Mass fraction of sodium bisulphite (NaHSO3), min | % | 97,5 | 96 |
3 | Mass fraction of water-insoluble matter, max | % | 0,01 | 0,02 |
4 | Mass fraction of alkali as (Na2CO3), max | % | 0,08 | 0,4 |
5 | Mass fraction of thiosulfates, max | % | 0,004 | 0,02 |
6 | Mass fraction of iron (Fe), max | % | 0,003 | 0,005 |
7 | Mass fraction of heavy metals (Pb), max | % | 0,0005 | 0,002 |
8 | Sodium sulphide presense | Shall stand the test per pt. 4.9 |