 NILE 
CHEMICALS
 NILE 
CHEMICALS
SELENIUM POWDER BLACK
| SPECIFICATION | |
| Se A.W. 78.96 | |
| Minimum assay | 99.5% | 
| Melting point | 220 - 222OC | 
| Maximum Limits of Impurities : | |
| Nitric acid insoluble matter | 0.01% | 
| Loss on drying | 0.05% | 
| Non - volatile matter | 0.05% | 
| Nitrogen compounds ( N ) | 0.02% | 
| Copper ( Cu ) | 0.01% | 
| Iron ( Fe ) | 0.006% | 
| Sulphur ( S ) | 0.0015% | 
| Tellurium ( Te ) | 0.005% | 
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