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Zro2: 64.0%min Hfo2: 1.3+-0.5% Al2o2: 1.1+-0.1% Fe2o3: 0.08% max Tio2: 0.1% max Sio2: 33.5% max Size: d50 =< 1.5um ( 5 microns guarantee). 25kg standard packing