Effect of Treating Conditions on Dimensional Behavior of Wood During Polyethylene Glycol Soak Treatments

A study was made of the conditions for soak treatments of green Douglas-fir face veneer in polyethylene glycol 600 and 1000. The dimensional behavior of the veneer during the treatment was greatly affected by an interaction between moisture content of the wood, polyethylene glycol concentration, time of immersion, and temperature of the treating bath. The behavior was studied further with ponderosa pine end-grain wafers. In general, the higher the moisture content of the wood, the more drastic the treating conditions that can be tolerated. When treating with polyethylene glycol concentrations up to 50 percent at 150?F, satisfactory results can be obtained at all moisture contents above fiber saturation. Polyethylene glycol 600 and 1000 appeared to behave in the same manner in these treatments.

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