Average particle size(um)is 10 Specific surface area(m 2 / g)is 0.36 Bulk density(g / cm 3) is 0.78 Polymorphs is Spherical Main characteristics of micro-iron, the preparation of ultrafine iron through a special process, uniform product particle size, narrow particle size distribution, high purity, low carbon, sulfur, phosphorus and other harmful elements, good fluidity, powder antioxidant ...