Product standard
Item/Grade Zinc borate 2335( 2ZnO.B₂O₃ 3.5H₂O)
Excellent grade First grade
Whiteness 99 95
Surface water% 0.5 1.0
Particle size, um 3-5 3-5
ZnO, % 37.0-40.0
B₂O₃, % 45.048.0
Loss on ignition% 13.515.5
Fineness (Residue on 45um sieve ) % 0.1
Specific gravity, g/cm3 2.67
Melting point 980
Temp. of dehydration > 320
Refractive index 1.58