Abstract: The paper reviews and develops a technique for the complex evaluation of a modified Brinell test for determining some of the mechanical properties of solid propellant. The basis for the approach is the time-dependent impression made by a ball into a solid propellant material under the action of a constant load, and the subsequent recovery when the load is removed. The technique results in twelve parameters, although not all of them are independent of each other. The calculation methodology is supported by the measurement of some viscoelastic characteristics of representative solid propellants.