The Blaine fineness tester is a simple and inexpensive instrument for the measurement of specific surface by air permeability. This paper deals with the variables met in the use of this instrument and their effect on the precision and accuracy of the calculated surface areas. Modifications of the Kozeny-Carmen equation which have appeared in the literature are recited. A porosity function, based on a single correction factor, is proposed which makes surface area data from the Blaine fineness tester fully independent of test conditions. It is shown that this same factor can be used to bring these data into agreement with nitrogen adsorption values.
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