In this study some physical properties of small samples (20×20×20 cm) of poplar wood (Populus nigra var.pyramidalis) after oil heat treatment with linseed oil was investigated. Two time levels (4.5 & 6 hours) and three temperature stages (180,200 & 220°C) were selected. The results of this study showed significant differences in effects of treatment temperature on physical properties of wood. The results also showed improvement in water absorption and thickness shrinkage properties in all treatments. The improvement in dimensional stability was correlated with temperature increasing but time seemed to have no effect on physical properties. Amount of water absorption that was 117.98% in control (untreated) samples after 48 hours soaking, was decreased to 25.94% in samples that were treated in 220°C for 6 hours. Also interaction effects of time/temperature only were seen in water absorption of samples. Radial, tangential and volumetric shrinkages of control samples were respectively 4.39, 8.99 and 12.95 percent that in best treatment conditions decreased to 2.99, 6.98 and 9.8 percent. Moisture content in laboratory condition (25 and 30% RH ) were 6.02 percent decreased to 3.91 to 4.6 percent in treated samples. WPG (weight percent gain) after treatment in samples were measured. WPG were 104.28 to 106.2 percent. Also results showed significant differences on WPG between this samples and bigger samples (50×20×20 cm).

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