Description

Whiteness
 *9
 *5
 
Surface water % ≤
 0.5
 1.0
 
Particle size, um
 **5
 **5
 
ZnO, %
 *7.***0.0
 
B2O3 , %
 *5.***8.0
 
Loss on ignition,%
 *3.***5.5
 
Fineness (Residue on *5um sieve ), %  ≤
 0.1
 
Specific gravity, g/cm3
 2.*7
 
Melting pointoC;
 **0
 
Temp. of dehydration oC>
 **0
 
Refractive index
 1.5
3.Packing and store 
Packing: brown paper double deck tectorial bag, and net weight per bag is *5kg.
store: storing in dry, ventilated and moistureproof conditions