| Articolo |
Specifiche |
Specifiche |
Specifiche |
Specifiche |
| Na2S | 60% min. | 60% min. | 60% min. | 60% min. |
| Fe | 1500 ppm max. | 150 ppm max. | 80 ppm max. | 50 ppm max. |
| Materiale insolubile in acqua |
0.4% max. |
0.4% max. |
0.4% max. |
0.4% max. |
| Na2C03 | 5% max. | 5% max. | 5% max. | 5% max. |
| Articolo | Specifiche | Specifiche | Specifiche |
| Na2S | 60% min. | 52 % min. | 50 % min. |
| Fe | 10 ppm/ 30 ppm max. | 10 ppm/ 30 ppm max. | 10 ppm/ 30 ppm max. |
| Materiale insolubile in acqua | 0.2% max. | 0.2% max. | 0.2% max. |
| Na2C03 | 3% max. | 3% max. | 3% max. |