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Table V The Maximum Safe Rate of Drying Species Beech Birch, yellow Cherry Elm, American Maple, soft (sap) Maple, hard Oak, red upland Oak, white upland Oak, lowland Sweetgum (red gum) Tupelo (black gum) Walnut Yellow-poplar 13.8 5.5 Based on properly selected and prepared samples whose MC is accurately measured 4/4 8/4 Thickness - % MC loss per day - 4.5 1.8 6.1 2.4 5.8 2.3 10.4 4.1 13.8 5.5 6.5 2.6 3.8 1.5 2.5 1.0 1.0 - 3.0 ? 5.3 2.1 10.9 4.3 8.2 3.3 Stage II Stage II begins at 2/3 green and continues to 30% MC. (Recall that when the lumber is at 30%, the core is wetter and the shell is drier; it is incorrect to say then that the lumber is at fsp.) During this Stage, the tension in the shell is falling off and tension is now developing deeper into the wood as cells inside drop below the fsp. Typical drying time for Stage II for 8/4 red oak is 20 to 30 days. 22PDF Image | Principles and Practices of Drying Lumber
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