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The approximate glass content was determined, by the heat of solution method, for commercial portland cement clinker obtained from 21 plants througho ut the United States. The approximate glass content of these commercial cl inker compositions was found to vary from 2 to 21 percent. The approximate glass content was also determined for these clinker compositions after the clinker had been subjected to special heat treatment in the laboratory. The results indicate that for a given clinker composition, the heat of solution of the clinker, and likewise the glass content, are dependent on the cooling conditions to which the clinker has been subjected. Relatively high glass contents may be obtained by cooling the clinker rapidly, and relatively low glass contents by cooling it slowly. CONTENTS Page

Approximate glass content of commercial portland cement clinker