The paper presents physicochemical characterization of components of the reaction mixture of iron powder and polycrystalline KClO4. Reactivity of the studied substrates was tested in the solid-state reaction. Research has been done to determine the effect of the grain shape and degree of crystallization of substrates on their selected thermochemical properties. Taking into regard amount of the generated heat and the amount of oxygen not involved in the reaction with iron, the mixtures containing 13, and 17 wt.% of KClO4 were found the most effective among those studied.
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