Dimensional Stabilization of Wood by Vapor Phase Chemical Treatments


  • Bennett R. Baird


White pine and Engelmann spruce cross sections (approx. 1 3/4 X 1 3/4 X 1/8 inches) were treated under various conditions of time, temperature, and moisture content by a vapor phase technique incorporating a number of different reactants. Two of the reactants considered, acetic anhydride and butyl isocyanate, reacted readily with the cell wall material of the wood samples and improved the dimensional stability of the wood by as much as 75%. Sticks 5 X 3/8 X 3/8 inches, with improved dimensional stabilities after reaction of 67%, gave losses in toughness and abrasion resistance of less than 25%. Generally less successful than the butyl isocyanate treatments were those with allyl, t-butyl, ethyl, and phenyl isocyanate.


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