Effect of Moisture Content on the Performance and Appearance of Resorcinol Glue Lines in Laminated Oak Lumber

Study revealed that in laminating red oak with a warm- setting resorcinol resin, it is possible to produce glue joints having satisfactory strength when the moisture content of the lumber ranges from 4 to 22 percent. Test specimens were fabricated by laminating straight-grained, defect-free, red oak with a two-component, resorcinol-formaldehyde resin, Penacolite 1260. Blanks 3/4 by 2-1/4 by 12 inches were cut from random-width, random length, kiln-dried, red oak lumber. Each of six groups of blanks were conditioned in a dry kiln to one of the following nominal moisture contents: 0, 4, 8, 14, 22, and 50 percent. After conditioning, the pairs were glued together following the specifications of the adhesive manufacturer. The block shear specimens were tested dry following the procedure outlined in ASTM D905-49. For exterior service, the moisture content of wood at gluing must be between 4 and 14 percent. The depth of adhesive penetration and the thickness of the final glue line are dependent upon the moisture content of the wood at the time of gluing.

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