1.Zinc oxide 2.Indirect/direct process 3.99.7%,99%,95%,90% 4. ... 5.Red/Bule process 1.Zinc oxide 2.Indirect/direct process 3.99.7%,99%,95%,90%4.We ... Bule process Zinc Oxide Grades : Indirect process Zinc Oxide, Direct Process Zinc Oxide, Calcined Zinc Oxide, Feed Grade Zinc ... density 5.606, stable under normal temperature. Insoluble in water and alcohol, soluble in acid, alkaki and amkonium solution. ...