Butarez = carboxy terminated polybutadiene

Butarez = carboxy terminated polybutadiene (german) butanetriol trinitrate 48 BWC = board wood cellulose (UK)... 

HMX was first evaluated with hydrocarbon binders (Butarez, a carboxy-terminated polybutadiene, and Butyl rubber) because of their high thermal stability, in addition to the expected advantages of high impetus levels and low flame temps. In the Butarez binder, an 85% HMX level produced an impetus of 370000 ft-lbs/lb and a flame temp of 2540°K. At 84% HMX, the system was under-oxidized, at 86% the flame temp exceeded 2600°K. Because of a less favorable heat of formation, higher HMX loadings were required for the Butyl rubber system, ie, about 87% HMX and 13% Butyl rubber vs 85% HMX and 15% Butarez for an impetus of 370000 ft-lbs/lb. In the hydrocarbon formulations, the Butarez polymer appeared more attractive thermodynamically... 

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