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Abstract. Some explosives could thermally explode at fairly low temperatures and the violence from thermal explosion may cause significant damage. Thus it is important to understand the response of energetic materials to thermal insults. The One Dimensional Time to Explosion (ODTX) system at the Lawrence Livermore National Laboratory has been used since 1970 to measure times to explosion, threshold temperature for thermal explosion, and determine kinetic parameters of energetic materials. The ODTX testing can also provide useful data for assessing the thermal explosion violence of energetic materials. Recent ODTX experimental data on LLM-105, RX-55-DQ, and LLM-191 are reported in the paper. The new capabilities developed for the ODTX system are also briefly described.