CAS NO:108-55-4 Item Index Test method Appearance needle-like crystal eyeballing Assay % 99 GB/T512 Melting point 95-98 C Auto Melting point device Residue on ignition 500ppm GB/T511 Water insoluble matter 50ppm GB/T268 Moisture% 0.2 GB/T260 Clarity of solution# 50 50%Aq. solution Pt-Co