Linear expansion and its relationship to moisture content change for commercial oriented strandboards

Linear expansion (LE) was measured along two principle directions for five types of commercial oriented strandboard (OSB). The measurements were made over four wetting steps from 35 percent to 95 percent relative humidity (RH) at 24?C. LE along both parallel and perpendicular directions of all OSBs occurred at a greater rate for moisture content (MC) change in the lower MC region. Statistical comparisons of the LE data between parallel and perpendicular directions for a given OSB and among various OSBs were performed. Regression equations expressing LE as a function of MC change were established for various products.

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