Sr No | Characterstics | Requirement as per IS 252 : 1991 (On Dry Basis) | Actual Average Quality (On Dry Basis) |
1 | Sodium Hydroxide (as NaOH) Percent by mass, min. | 99.5% | 99.5% |
2 | Sodium Carbonate (as Na2CO3) Percent by mass, max. | 0.40 | 0.40 |
3 | Chlorides (as NaCl) ppm, max. | 1000 | 100 |
4 | Sulphates (as Na2SO4) ppm, max. | 1000 | N.D. |
5 | Silicates (as SiO2) ppm, max. | 200 | 20 |
6 | Iron (as Fe) ppm, max. | 20 | 10 |
7 | Copper (as Cu) ppm, max. | 2 | 0.5 |
8 | Manganese (as Mn) ppm, max. | 1 | 0.5 |
9 | Chlorates and Perchlorates (as NaClO3) ppm, max | 10 | 10 |
10 | Matter Insoluble in water Percent by mass, max. | 0.05 | Nil |