... 237 Anhydrous Zinc Borate Granular Size: 3um-7 um used in PVC, PE, Polyolefin, Epoxy 3.5 H2O Zinc BorateSpecification: Item/Grade ... Zinc borate 2335( 2ZnO.B2O3 3.5H2O)Excellent gradeFirst gradeWhiteness 9995Surface water%≤ 0.51.0Particle size, um 3 ... -73-7ZnO, % 37.0-40.0B2O3 , % 45.0-48.0Loss on ignition,% 13.5-15.5Fineness (Residue ...