Sodium Selenite 1. assay>98.5% 2. trace element ,increase the egg, hatch and growth rate of birds; Sodium SeleniteChemical properties: Formula: Na2SeO3 M.W.: 172.9Other tech indexs:(1) 98% , assay: 98% , counted by selenium 44.5% 1kg x 10bottles, in box(2) 10% mixture , assay: counted by selenium 10% , 25kg in paper-plastic bag(3) 2% mixture , assay: counted by selenium 2% , 25kg in paper-plastic ...