Abstract:Five lots of RDX (1,3,5-trinitro-1,3,5,-tri-azacyclohexane), having different sensitivities, according to Large-Scale Gap Test (LSGT) results, were studied. Laboratory investigations included direct insertion mass spectrometry, liquid chromatography, powder x-ray diffraction, polarized light with hot-stage microscopy, infrared and Raman spectroscopy, and differential scanning calorimetry (DSC). DSC proved useful at distinguishing differences between lots. The RDX lots studied included three made in the United States by BAE Ordinance Systems (Holston), one from Eurenco (formally SNPE) and one from Dyno Nobel. Of Holston RDX, two lots had been reprocessed by Eurenco to reduce sensitivity. Increased sensitivity appeared to correlate with increased HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) content. Aging and heating contributed to the formation of an RDX/HMX eutectic. Key Words:RDX, insensitive RDX, RDX/HMX eutectic, large-scale gap test Introduction:
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