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In page Engineered wood:

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Plywood and OSB typically have a density of 560–640 kg/m3 (35–40 lb/cu ft). For example, 9.5 mm (38 in) plywood sheathing or OSB sheathing typically has a surface density of 4.9–5.9 kg/m2 (1–1.2 lb/ft2).[citation needed] Many other engineered woods have densities much higher than OSB.