Durability of southeast-Asian hardwood plywood as shown by accelerated-aging tests and 10-year outdoor exposure

Plywood panels made with veneers from eight southeast-Asian hardwood species and Douglas-fir cores were measured for delamination and shear tested after 127 months of outdoor exposure. The results are compared with data obtained at the time of panel fabrication from five accelerated-aging treatments: vacuum-pressure soak (PS 1-74); standard boil (PS 1-74) for 2, 5, 10, and 25 cycles; automatic boil (ASTM D-3434) for 20, 40, 100, and 200 cycles; weatherometer (ASTM G-23-69); and wet-dry cycling. Percentages for wood failure in shear-test samples after 127 months of outdoor exposure differed least from shear-test samples aged by the 25-cycle standard-boil method at the time of panel fabrication. Performance after weatherometer, wet-dry cycling, and 1-cycle vacuum-pressure methods did not correspond well to 10-year performance. Wood species responded differently to the accelerated-aging tests.

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