4. Physical properties:

Character: Yellow or slightly red yellow powder or small crystalline flakes, easy to change color when exposed to light.

Melting point (℃): 888-890

Boiling point (℃): 1472 (decomposition)

Relative density (water=1): 9.53

Solubility: insoluble in water, insoluble in ethanol, soluble in nitric acid, acetic acid, and hot alkaline solution. Specification:

Lead oxide: PbO-05 has a purity of over 99.999%, and the total impurity content of silver, aluminum, arsenic, copper, cadmium, cobalt, iron, indium, magnesium, nickel, lead, and tin is less than 10ppm;