55.1 lbs (25kg) Gold & Silver Free Coarse Assay Litharge
- Model: 15220-55
- Shipping Weight: 58 LBS
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Gold & Silver - Free Coarse Powder, Pueblo Type Assay Litharge (PbO)
55.1 lbs (25kg)
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.
SPECIFICATIONS
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)