A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.

A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.

The invention relates to Insensitive Munition (IM) energetic materials particularly non-phthalate IM propellant compositions. An energetic composition suitable for use as a propellant comprises the following components in the following relative proportions: component A; from 60% to 90% by weight of a highly energetic filler comprising at least one nitramine compound; and component B: from 5% to 20% by weight of a binder, component C: from and 3% to 15% of a plasticiser wherein the plasticiser comprises formula (A) of from 1% to 9% by weight, wherein Formula (A) is a diester plasticiser of
R.sub.1OC(O)R.sub.3C(O)OR.sub.2,Formula (A) wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from C.sub.3 to C.sub.10 alkyl or alkenyl. the percentages by weight of components A, B and C, together with minor additives, if any, adding to 100%.

A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.

A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.