Description
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| GOLD FREE Assay Litharge – Lead Oxide (PbO) |
| A yellow/orange granular assay litharge that is C.P. grade (chemically pure). This material is used for fire assaying processes for the quantitative determination of precious metals in an ore. It is the purest form of litharge, particularly low in silver, and is milled to a fine and uniform particle size for enhanced reactivity and consistency of reaction. |
| SPECIFICATION |
| Lead Monoxide (PbO) |
99.95 % Minimum |
| MAXIMUM IMPURITY LEVELS |
| Gold (Au) |
1.5 ppb Maximum |
| Iron (Fe) |
0.002 % Maximum |
| Free Metallic Lead (Pb) |
0.04 % Maximum |
| Red Oxide Lead (Pb3O4) |
0.05 % Maximum |
| Other Trace Elements |
See ASTM Spec B29 for Corroding Grade Lead |
| Silver |
Approx. 2 ppm |
| SG (20oC) |
9.53 |
| Particle Size 14 mesh retained |
>60 % |
| Physical Properties |
| Color |
Yellow/Orange |
| Form |
Granular |
| Specific Gravity |
9.5 g/cc |
| Apparent Density |
23-33 g/cu.in |
| Molecular Weight |
223.21 |
| Refractive Index |
2.67 |
| Melting Point |
1630°F. (888°C) |
|
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