Composite solid propellants based on ammonium perchlorate/hydroxyterminated polybutadiene/isophorone dyisocyanate including two metal components: aluminium and magnesium with different contents have been represented in this paper. The mass of metal powder has increased in relation to oxidant, with constant bimodal fraction ratio and total solid phase. Parameters of burning rate laws, apparent viscosity, uniaxial mechanical characteristic, density and energetic values have been determined and compared in accordance to the propellants of the smoke reduction research.