... refractive index 2.008-2.029, melting point 1975°C. Soluble in acid, sodium hydroxide and ammonium chloride; insoluble ... and etc.Processing Method: Heat zinc ingot to 1000°C to have it melted and gasified, and then import ... soluble %≤0.1Screen Residues thriugh (45um)mesh%≤0.1Volatile105°C %≤0.3Packaging: 25KG/piece, plastic woven bag lined with ... : 650T Zinc oxide, Zinc white, food, phama, industry grade