*Main content:99.5% min
*Loss on drying:0.5% max
*Water Insoluable:0.005% max
*Chloride:0.2% max
*Iodide:0.001%max
*Sulphate:0.005%max
*PH Value(5%):4.5—6.0
*Pb:0.2ppm max
*Fe:0.5ppm max
*Cu:0.5ppm max
*Bi:0.2ppm max
*Peroxide solution penetrability(250g/l):93～100(410nm)
*Transparency test:Qualified
*Peroxide solution chromaticity(250g/l):(15.0 Black once)max