Function and characteristic： 1. Small granule, even granularity, it is possessed of high dispersing ability. The chemical reaction is fast and completely, the reaction speed is identical. 2. The purity is high. As raw material, the product purity is high and stable. There is little impurity, reduce the impact on main products of other resultants. 3. The single granularity density and proportion are small. it is difficult to precipitate in the reaction process. 4. It is pure white color, and has not influenced the result products color after reacting. Charactristics Limited Y013 Y014 Y015 Y016 Y017 Y018 Zinc oxide(counted by dried subtances)%≥ 99.8 99.8 99.7 99.5 99 98 metal(Zn) %≤ no no no no no no Lead oxide(Pb)%≤ 0.001 0.003 0.037 0.1 0.18 0.2 Cupric oxide(Cu)　%≤ 0.0001 0.0001 0.0002 0.0014 0.002 0.003 Manganic oxide (Mn) % ≤ 0.0001 0.0001 0.0001 0.0001 0.0002 0.0003 Hydrochloric indissoluble substance %≤ 0.001 0.006 0.01 0.015 0.03 0.06 Ferrous oxide( Fe) %≤ 0.0002 0.0003 0.001 0.002 0.008 0.008 Burning decrement %≤ 0.08 0.01 0.2 0.2 0.3 0.4 Water dissoluble% 　 %≤ 0.1 0.05 0.1 0.2 0.3 0.3 105℃ volatile substances%≤ 0.01 0.1 0.3 0.4 0.6 0.8 Grain size （um） 10-30nm 2﹣20 2﹣20 4-50 4-50 4-60 Oil absorption value g/100g ≤ / / 14 14 / / Color（standard sample） white white white white white tiny yellow Reducing color power (with standard sample）≥ / / 100 95 / /