Bond Strength as Indicated By Wood Failure Or Mechanical Test

An important element in the manufacture of plywood is the property of the glue bond — its strength, cost, and permanence. Two general methods have been used to measure and appraise bond strength: l) breaking loads of mechanical tests, and 2) the percentage of wood failure in broken joints. The glue technician must decide which of these two tests is best for his specific, purpose, and often this is a difficult decision to make. In the study presented the percent of wood failure of any single specimen did not provide a satisfactory basis for estimating bond strength of that specimen. Mechanical test results have been shown to give more reliable estimates of bond strength than the percent wood failure methods.

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