Study of a liquid insulation for the solid rocket motor

Formula of a liquid insulation for a solid rocket motor (SRM) was studied in this paper. By analyzing vulcanization mechanism and comparing mechanical and thermal properties of the rubber, composition of the insulation with liquid raw material was determined. Ignition tests of motors with liquid insulation were successful. Results indicated that the tensile strength, elongation at break, shear strength, specific heat and thermal conductivity of the liquid insulation were 6.25 MPa, 590%, 3.61 MPa, 3.4174 × 103 J/(kg K) and 0.421 W/(m K) respectively. The success of various ground ignition tests and flight test proved that this new liquid insulation can fulfill requirements of the SRM.