An investigation was made to determine some of the strength and elastic properties of honeycomb—type core materials fabricated from resin—impregnated rayon-mat fabrics. Eight blocks of core material were made at the Forest Products Laboratory by the corrugation method, using both 30— and 45-pound rayon-mat fabrics. Cores were made with each of the above fabrics corrugated either parallel or perpendicular to the preferred direction of the individual fibers of the mat and with the contact resin content of each core approximately either TO or 20 per¬cent of the total weight of the finished core.
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