Abstract
The burning of pressed PETN, RDX and HMX has been studied at pressures up to 200 atm. It has been shown that, provided the pressure is not too high, variation of the loading density varies the linear burning rate but the mass burning rate remains essentially constant and the burning is quite slow and steady. Cine photographs have shown that a melting stage occurs during the burning process and by postulating the presence of an effectively continuous molten layer, the constant mass burning rate is most easily explained. The observation of a slight increase in the mass burning rate when the particle size of a powder is increased supports this explanation since larger particles would lead to a more irregular surface of the molten layer and hence to a somewhat larger burning area.
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