biggest zinc borate supplier Item/GradeZinc borate 2335( 2ZnO.3B2O33.5H2O)Excellent gradeFirst gradeWhiteness9995Surface water % ≤0.51.0Particle size, um3-53-5ZnO, %37.0-40.0B2O3 , %45.0-48.0Loss on ignition,%13.5-15.5Fineness (Residue on 45um sieve ), % ≤0.1Specific gravity, g/cm32.67Melting pointoC;980Temp. of dehydration oC>320Refractive index1.58 CAS:1332-07-6EINECS No.:215-566-6 Introduction ...