Science and Technology of Energetic Materials

Vol.80, No.2 (2020)

Research paper

Expansion agent utilizing thermite reaction
Yusuke Kaji, Tomoya Ishikawa, and Hideaki Sugihara


Crushing method utilizing thermite reaction has been known in Japan. This system is not defined as explosives in the Japanese Explosives Control Law, so it is used as non-explosives. Now, Kayaku Japan Co., Ltd. manufactures and sells utilizing thermite reaction agent “ROCKRACK®”. USA DDT test was experimented. As a result, ROCKRACK® was not detonated. In this time, ROCKRACK® was used for two patterns sinking crush, and we confirmed satisfactory crush. From these crush tests, it was found that diameter of crushed stone of ROCKRACK® was larger than that of explosives, and ROCKRACK® could be used in deck charge under appropriate conditions.

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non-explosive, ROCKRACK®, thermite reaction, bedrock, fragmentation

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