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Development and characterization of asbestos-free rubbers for use as rocket motor insulators are presented. Such insulation is based on aramid fiber in the pulp form as reinforcement for Ethylene Propylene Diene Monomer (EPDM) in the liquid form. Aramid fiber (Kevlar) in the pulp form has been used and characterized as EPDM filler material. This method permits manufacturing EPDM rocket motor insulation in which Kevlar pulps are dispersed and immobilized in the EPDM polymeric matrix. A detailed description and procedure for the mixing cycle is explained. The curing methodology was justified. Kevlar pulp/EPDM has been shown to exhibits better thermal properties than its asbestos containing counterpart. Its thermal characteristics however fall short of some of the best asbestos insulators.

IMPROVEMENT OF THE PROPERTIES OF INSULATING POLYMERS USING ARAMID FIBER FOR SOLID ROCKET MOTOR INSULATION