... flame retardant. There are some formulations of XZnO.YB2O3.ZH2O, in which Zinc Borate anhydrous is called ZB-23 (2ZnO.3B2O3). ZB700 ... ,500kg/bag,and can design package according to order. Grade /ItemZinc borate anhydrous ( 2ZnO.3B2O3)Excellent gradeFirst gradeWhiteness9995Surface water,%, ≤ 0 ... ,°C980Refractive index1.58CAS No.1332-07-6 Fire retardant -Zinc Borate anhydrous(ZB700 Grade Specification)