Zinc Oxide Paste »Zinc Oxide Paste contains not less than 24.0percent and not more than 26.0percent of ZnO. It may be prepared as follows: Zinc Oxide 250g Starch 250g White Petrolatum 500g To make 1000g Mix the ingredients. Packaging and storage— Preserve in well-closed containers,and avoid prolonged exposure to temperatures exceeding 30. Identification— The residue obtained in the Assayis yellow when hot and white when cool. Minimum fill á755ñ: meets the requirements. Assay— Using about 600mg of Paste,proceed as directed in the Assayunder Zinc Oxide Ointment. Auxiliary Information— Staff Liaison:Lawrence Evans,III,Ph.D.,Scientist Expert Committee:(PA6)Pharmaceutical Analysis 6 USP28–NF23Page 2055 Phone Number:1-301-816-8389