Since Dow Corning discontinued production of 93-119, 93-120, 93-122, Pantex joined with the Lawrence Livermore Laboratory to develop substitutes for these materials. Raw materials chosen for this project include Sylgard 184, Sylgard 1 8 6 , 43-6527 Dielectric Gel, Q3-6559 Accelerator, DC 1 1 0 7 and Cab-o-Si1 MS-75. properties of these materials. written to detail the work for specific substitutes. This report deals with physical and chemical Subsequent reports will be I N T R O D U C T I O N With the discontinuation of production of several Dow Corning addition cured potting compounds used by the DOE Weapons Complex, it became necessary to develop substitutes or alternate materials. This task was undertaken jointly by Pantex and the Lawrence Livermore Laboratory (LLL). This DISCLAIMER
The flow of RX-08-FK, a mostly organic, high-energy, paste-extrudable explosive containing about 75% suspended solids, was experimentally studied. The paste was forced through long capillary tubes in a specially designed, double-piston rheometer at temperatures ranging from −54 to +74 °C, and at nominal shear rates at the tube walls from 50 to 40 000 s−1. Paste was preconditioned for many hours to achieve the desired experimental temperature and the rheometer itself was enclosed in a preconditioned temperature-controlled chamber. We found the paste to be pseudoplastic with significant yield stress and entrance effects. The results of 176 runs at temperatures of −35 °C and higher were fitted by an empirical model much like the original model suggested by Herschel and Bulkley, modified to include a factor correcting the stress for the substantial entrance loss experienced with this paste. The observed stresses at −54 °C were substantially higher and less shear dependent than those extrapolated from the above model; these differences may relate to the fact that the glass-transition temperature of RX-08-FK is approximately −60 °C.
NOTICE 7ha ~p o n was prepared as an acco~nt of work sponsored by the United Stater Government. Neither the UNted Stater nor the United Starer Dcpartrnent of Energy, nor any of their employees, nor any of their contractors. subcontractors, or their employees. makes any warranty. cxprcs or implied, or asurnes any lcgd liability or responribllity for the accuracy. completeness or wefulnerr of any informpiion, apparatus. product or proces duelored. or reprrrenU that its uoc would not I infringe pnvately owned fights.
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