... silicon powderamorphous silicon powderultrafine silicon powderpolysilicon powder high purity silicon powdersuper fine silicon powder PROPERTIESSilver gray or Dark gray ... , average size 2um,and so on. High purity silicon powder Polysilicon powder99%,99.9% ,99.95% ,99.99%, ... produce different particle or different purity of silicon metal powder PACKING AND STORAGEIron barrel or plastic bag package. ...