55.1 lbs (25kg) Gold Free Granular Assay Litharge

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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)