Wet Process Hardboards from Aspen Sapwood and Discolored Heartwood

Laboratory wet process hardboards were made from aspen sapwood and discolored heartwood refiner groundwood pulps at three freeness levels. Discolored heartwood in the solid wood form showed a higher moisture content, the same specific gravity, lower toughness strength, and a lower pH when compared to sapwood. The pulps from the discolored heartwood appeared to contain more fines and to have a lower swollen volume than did the sapwood pulps. The sapwood boards had a higher modulus of rupture, modulus of elasticity, and internal bond strength but a lower dimensional stability in thickness when compared to the discolored heartwood boards.

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