Vacuum-pressure soak plus ovendry as an accelerated-aging test for wood-based panel products

Vacuum-pressure soak (VPS) at room temperature was investigated as an alternative to the hot water soak and steaming steps in the current ASTM D 1037 accelerated-aging tests. Oriented strandboard, flakeboard, isocyanate-bonded particleboard, and hard-board siding were included. The effects of steaming and cyclic hot water soak plus ovendry (OD) exposure were also investigated. For the phenolic-bonded flakeboard, the various alternative exposures had essentially the same effect on static binding and in-plane shear properties as the standard test. For the other materials, the exposures that were closest to the standard for these materials were four cycles of VPS plus steam plus OD and four cycles of hot water soak (93?C) plus OD. The 93?C temperature was greater than that used in the soaking step of the standard test (49?C). Four cycles of VPS at room temperature plus OD and six cycles of steam (93?C) plus OD were the least severe exposures. The hot water soak plus OD was the most likely candidate as an alternative to the six-cycle test because it was the simplest and least time consuming.

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