55.1 lbs (25kg) Gold & Silver Free Coarse Assay Litharge

Contact Legend Inc for more information regarding International Orders 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)