Assay grade litharge powder or granule, free of precious metals, used in fire assay or mixing fire assay flux.

Specifications:

ITEM INDEX	STANDARD
Appearance:	Yellow powder or granules
Purity(on dry basis):	99.5%min
Acid insolubles:	0.1%max
Moisture:	0.2%max
Pt:	1.5ppbmax
Ag:	0.2ppm max
Au:	1.5ppb max

Applications:

Mainly used in assay of precious metal,

Storage:

Stored in dry and ventilate place; kept far away from fire,  water or strong acid; Preventing from dampness. 

Lead monoxide assay grade