It has high content of active  bi loose density,good flowability  small specific surface area it is flammable and explosive and will produce high temperature and dazzling white light during burning 

used in rocket ramjet and removing hydrogen chloride from the propellant gas ,used as reductant desulfurizing agent in metallurgy and used to make flash powder and lead alloy ,organic synthesis ,illuminating composition 


particle size:-40/-60/-200 mesh 
chemical content: Mg over 99.5% Si under0.01% CL under 0.005%
shape of powder: irregular