... talcum powder,kaolin, graphite, BT-1500 Centrifugal Sedimentation Particle Size AnalyzerBT-1500 type has excellent performance and wide application, ... Normally 3-15 minsCentrifuge Speed: 750 rpm , 1500 rpmApplicationVarious nonmetal powder such as heavy calcium carbonate, ... requirement.Accuracy and repeatability test results of BT-1500 (for standard sample) D10D16D25D50D75D84D90Standard value(μm)19. ...