Chemical reactivity test for thermal stability
Lawrence Livermore National Laboratory (LLNL) has developed a thermal stability test procedure that is currently being evaluated by the Department of Defense (DOD) Explosives Safety Board as an equivalent alternate test to the DOD Technical Bulletin 700-2 {open_quotes}Thermal Stability Test at 75{degrees}C{close_quotes}. The LLNL Chemical Reactivity Test (CRT) is significantly more severe than the existing {open_quotes}Thermal Stability Test at 75{degrees}C{close_quotes} and is also quantitative in nature. It has been approved by the Department of Energy (DOE) Explosives Safety Committee as an equivalent alternate thermal stability test and has been in use by LLNL for over 30 years. It is currently used by other DOE and DOD organizations as the standard small-scale safety test for determining thermal stability and material compatibility. The LLNL CRT is run on a 0.250 gm sample for 22 hours at 120{degrees}C rather than the 50 gm sample for 48 hours at 75{degrees}C as required for the Thermal Stability Test. Thus the CRT is a much more severe test since it is run at 120{degrees}C rather than 75{degrees}C. Simple Arrhenius kinetics predict a material decomposition rate of approximately 25 times greater at 120{degrees}C than at 75{degrees}C. Any material under test that exhibits gas evolution exceeding 4 cc/gm (approximately 0.8 % decomposition) is considered suspect and additional testing and/or evaluation is then performed to determine if the material is thermally unstable. In addition to the CRT being significantly more severe and quantitative, there are significant other advantages for using the CRT. These include: (1) the increased safety afforded to operating personnel and equipment by using a fraction of the test material, (2) the cost savings associated with reduced sample heating time and the use of less sample material, and (3) the reduced amount of post-test waste produced.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10177037
- Report Number(s):
- UCRL-JC-117941; CONF-9408136-1; ON: DE94017526; TRN: 94:008010
- Resource Relation:
- Conference: 26. Department of Defense explosives safety seminar,Miami, FL (United States),16-18 Aug 1994; Other Information: PBD: Jul 1994
- Country of Publication:
- United States
- Language:
- English
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