ASTM B330 method for determination of powder fisher sub sieve size of refractory metals and compounds-fisher method 201-30
ASTM B330 method for determination of powder fisher sub sieve size of refractory metals and compounds-fisher method is China national standard GB 3249-1982 method for determination of powder particle size of refractory metals and compounds-fisher method. This standard is suitable for the determination of refractory metals and compounds with particle size (shown in volume surface area average diameter) ranging from 0.5 to 50 microns.
Fisher Sub Sieve Sizer https://www.isizer.com/fisher-sub-sieve-sizer-principle/