Sr. No. | Characteristics | Requirement to |
Grade A | Grade B |
01 | Appearance | Anhydrous, white powder, odourless, bitter saline test | Anhydrous, white powder, odourless, bitter saline test |
02 | Solubility | Soluble in water and glycerol, insoluble in alcohol | Soluble in water and glycerol, insoluble in alcohol |
03 | Density | 1.385 | 1.385 |
04 | Sodium Sulphate (as Na2SO4) per cent by mass (on dry basis) | 99.0 % min. | 98.0 % min. |
05 | Matter insoluble in water per cent by mass | 0.25 % max. | 0.50 % max. |
06 | Chloride (as NaCl) per cent by mass | 0.30 % max. | 2.00 % max. |
07 | Iron (as Fe) per cent by mass | 0.002 % max. | 0.002 % max. |
08 | Loss on drying per cent by mass | 0.5 % max. | 1.0 % max. |
09 | pH of 10 % solution | 7.0 to 7.5 | 7.5 to 8.0 |