Laboratory tests show that five underclays from western and southwestern Indiana are potential sources of bonding clay for foundaries. Green dry strength tests were determined for each sample, and the results of these tests were compared with the results of tests obtained from a commercially used bonding clay. The particle-size distribution and the mineral composition of the underclays are most important in interpreting the results of physical tests. The samples which had a high clay content and a rather high percentage of montmorillonite produced the best green and dry strength test results. Five areas in Indiana are most favorable for commercial production of bonding clays.

Murray, H. H., 1957, Pennsylvanian underclays—potential bonding clays for use in foundries: Indiana Geological Survey Report of Progress 11, 27 p., 6 figs.

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Keywords: clay, shale, industrial minerals

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