Appearance:Dark grey Metallic PowderApplication: rhenium sample; Rhenium of various superalloys; The base material of various rhenium partsHall flow (s/50g): â¦30sParticle size: FSSS 0-20μm, 15-45μm, 15-53μm, 53-105μm, 53-150μm, 105-250μm ï¼Standard: YS/T 1017-2015