Abstract
Hardness was measured on a Rockwell type instrument modified to measure the depth of the unrecovered indentation. The indentors were balls of various diameters and cones with various vertex angles. The hardness of the following materials was investigated: aminoplast (amino resin), K-17-2, FKP-1, polymethylmethacrylate (plexiglas), polyvinyl chloride (PVC), polyethylene, and teflon. The hardness is related to the strength and elastic characteristics.
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