Thermal environment of chamber inside of solid rocket propulsion system by high-temperature, high-pressure combustion gas is serious. Under this environment, insulator is between propellant and chamber structure for protecting chamber structure during burning time or mission time.
Extensive researches, that is, development of material which heat protection performance is excellent and density is low, understanding of thermal reaction characteristics of material, test data accumulations from real motor or evaluation motor, and etc, are performed in advanced countries. Unfortunately, since Kevlar/EPDM elastomer was developed in Korea, researches for insulator were not active. Recently, necessity of insulator material development and promotion of thermal design/analysis capacity are needed for optimization of propulsion system.
In this paper, in order to understanding of thermal reaction mechanism of Kevlar/EPDM elastomer, which is applied extensively, test equipment was manufactured and tested in condition of gas pressure 6.89 ～ 9.23 , gas temperature 2,700 ～ 3,300, gas velocity 7.2 ～ 25.0 , exposed time 10 ～ 50 and drew a conclusion as follows.

1) In exposed time 10 ～ 50 , thermal destruction depth of Kevlar/EPDM elastomer is proportion to square root of exposed time.

2) At gas pressure 6.89 , gas temperature 3,300, gas velocity 7.2 , thermal destruction depth of Kevlar/EPDM elastomer is linearly proportion to gas velocity, and following relation shows between gas velocity and thermal destruction constant and has an 14 % error.

3) In gas pressure 6.89 ～ 9.23 , thermal destruction depth of Kevlar/EPDM elastomer is increased according to increase of gas pressure but this tendency is not dominant.

4) In gas temperature 2,700 ～ 3,300, thermal destruction depth of Kevlar/EPDM elastomer is increased according to gas temperature, but this tendency is not dominant.

5) In condition of gas pressure 6.89 ～ 9.23 , gas velocity 7.2 ～ 25.0 gas temperature 2,700 ～ 3,300, thermal destruction of Kevlar/EPDM elastomer is begun within 3 after ignition.

6) Deviation of Thermal destruction depth of Kevlar/EPDM in same thermal environment shows within 14.0%.

7) Evaluation and analysis method for evaluating of thermal reaction of Kevlar/EPDM elastomer were established and method of Coefficient of Variation is appropriate for analysis of thermal destruction depth.
* A thesis submitted to the committee of Graduate School, Chungnam National University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Conferred in August 2016.