Index/Item | Zinc borate( 2ZnO .3B2O3 . 3.5H2O ) | |
Excellent grade | ||
Whiteness | 99 | |
Surface water % ≤ | 0.5 | |
P article size , um | 3-5 | |
Pb, PPM < | 10 | |
Cd, PPM < | 5 | |
ZnO , % | 37.0-40.0 | |
B2O3, % | 4 6 .0-48.0 | |
H2O(hydrate), % | 13. 0 -15.5 | |
Fineness (Residue on 45um sieve ) , % ≤ | 0.1 | |
Specific gravity, g/cm3 | 2.67 | |
Melting point ℃ | 980 | |
Temp. of dehydration ℃ | 2 9 0 | |
Refractive index | 1.58 | |
CAS No. | 12767-90-7/138265-88-0/1332-07-6 |