Abstract
Abstract : The determination of the surface areas of powders is of considerable importance for the quality control of composite propellants. For many years satisfactory control has been achieved by the use of an air permeability method but this was found unsuitable for very fine ammonium perchlorate and solid burning rate catalysts which are being used to an increasing extent in fast-burning compositions. Of the various methods considered for measuring the surface areas of these very fine powders, the continuous flow gas adsorption method appeared promising but had several disadvantages in operation. The report describes modification to the method which have removed the disadvantages. (Author)
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