Specification:Purity 28-30% Analysis:(for reference only) Total Zinc content(as ZnS) 28?0% Tinting strength (in comparison with standard sample) 100% min Oil absorption 14% max Covering power,g/㎡ 100 max Soluble salt in water 0.4% max Moisture 0.3% max PH value 6.8?.0 ZnO dissolve in ethane acid 0.7 max Fineness:passing through 320 mesh (diameter 0.044mm) with residue 0.3%max Uses: Mainly used for paint industry to blend all kinds of light coloured paints,and also can be used for rubber,printing ink,varnished cloth,oil cloth,paper making,enamel and tan,etc.