1.Calcined alumina powder 2.99.5%min 3.SGS,ISO ... substrate,refractory etc fine calcined alumina powder 99% 1.Production process: Bayer process, high temperature rotary kiln,washed to remove sodium, ... high-temperature electronic ceramics, wear-resisting ceramics, electronic substrate,shaped & unshaped refractories.The specification of various code is shown as belows: High temperature alumina powder ...