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Gold & Silver - Free Coarse Powder, Pueblo Type Assay Litharge (PbO) - Bag |
A Reddish / Orange coarse powder 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 gold, and is milled to a uniform particle size for enhanced reactivity and consistency of reaction. |
SPECIFICATION |
Lead Oxide |
99.0% Min |
Silicon Dioxide |
0.1% Max |
Calcium Oxide |
0.08% Max |
Aluminum Oxide |
0.04% Max |
Iron |
0.025% Max |
Zinc |
0.0005% Max |
Arsenic |
0.0005% Max |
Bismuth |
0.005% Max |
Silver |
0.005 troy oz/ton Max |
Gold |
< 2 ppb |
Metallics |
0.50% Max |
Insoluble materials |
0.3% Max |
Physical Properties |
Color |
Various: Reddish/Orange, Yellow |
Form |
Coarse Powder |
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. (888C) |
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