This paper presents a new test set-up in a closed autoclave for testing the deflagrative behaviour of substances is presented. Several substances are tested in the Time/pressure test (UN test C.1) and in the closed autoclave. It is first shown that the results of the tested substances in the Time/pressure test (UN test C.1) stay in an good accordance with the tabled values in the UN Recommendation on the Transport of Dangerous Goods (hereinafter UN Transport Regulation). The testing of these substances in the closed autoclave and the comparison of the values show a good very good repeatability. When comparing the results of the closed autoclave with the tabled results in the UN Transport Regulation and the results of the Time/pressure test (UN test C.1) performed it is pointed out, that well-known deflagrative substances like ammonium nitrate which show no deflagrative behaviour in the Time/pressure test (UN test C.1) can be brought to deflagration in the closed autoclave. It therefore can be maintained that the test set-up presented here is more sensitive than the Time/pressure test and can be used as an alternative for the deflagration testing.
