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This paper summarizes the work done at the Forest Products Laboratory on different types of paper cores for use in aircraft and for house construction. Discussions are given of the manufacturing processes and, finally, the results of tests of core materials made from several papers containing various kinds and quantities of resin. Conclusions of a theoretical analysis are presented for predicting the compressive and shear strength of the aircraft-type paper core. Included in a discussion of core materials for housing are the results of tests of strength, thermal insulation, decay, and actual exposure to weather in a test unit.
Kuenzi, Edward W.
Engineer, Forest Products Laboratory, Forest Service, U. S. Dept. of Agriculture, Madison, Wis.