KOSEKI Hiroshi
In order to conduct the cause investigation of an explosive incident by raw pyrotechnics mixtures, various hazard evaluation tests were performed. Explosions occurred during manufacturing fire-works, which consisted of potassium perchlorate (KClO4), aluminum (Al) powder and antimony trisulfide (Sb2S3). Identification of the explosive materials was conducted by sampling of soil at the explosion places including craters and analyzing them. Though we found it was very stable thermally, at least up to 500 ℃ based on the results of DSC and TG-DTA, it appeared high sensibility in friction and falling impacts. By the gap test (sympathetic detonation test), we found it was easy to develop sympathetic detonation. Therefore, more careful treatment is needed when we manufacture, treat or consume these materials.