1. Product indicators Appearance White crystalline powder Effective content,% above 99 Loss on drying,% no above0.5 Heavy metals (PB), PPM no above 10 Heavy metals (as), PPM no above 2 2. Package specification 1.0kg /Aluminum foil bag ; 15kg / cardboard barrel; 25kg / cardboard barrel 3. Storage method Avoid freezing environment, store in a dark, cool and dry place, room temperature and sealed.