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Color and shape    White crystalline powder
Purity    > 99.0 %
Melting point    160-164 ℃
Water     < 0.5%
Residue on ignition %    0.2 %
Heavy metals (as Pb)     < 10 PPM
Lead     < 10 PPM
Arsenic     < 3 PPM
Cadmium     < 1 PPM
Mercury    < 1 PPM