Measuring Durability of Adhesive Resins on Paper Substrates

When adhesive bonds between two Douglas fir blocks are broken, the coefficient of variation for the measured bond strengths often approaches 15 percent. Presumably, this reflects the normal variation in wood surfaces. Large numbers of test specimens and tedious preparative techniques are required for the reliable determination of bond quality and durability. In an effort to reduce the work required to test an adhesive, paper strips were impregnated with adhesive resin, cured and weathered under the same conditions used for typical block specimens. Tensile strength measurements on the impregnated paper strips gave a coefficient of variation of 5 percent when manipulated in the usual way. With refinement, resin-impregnated paper strips may be a potential method of modeling a glued-block experiment. At the current stage of refinement, this test does not always rank durability of several adhesives in the same order produced by the well-developed wood-block method.

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