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iron powder size of less than 1mm iron particles aggregate. Colour: Black. It is the main raw material powder metallurgy. According to size,Website:http://www.sairui2009.com, it is customary divided into meal, medium pink, powder, fine powder and ultra-fine powder of five levels. 500µm particle size of particles in the range of 150 ~ coarse powder consisting of iron powder, particle size 44 ~ 150µm medium powder, 10 ~ 44µm of a fine powder, 0.5 ~ 10µm is very fine powder, is less than 0.5µm ultrafine powder. Generally through 325 mesh standard sieve size less than 44µm powder that is called th