The present study is aimed at the effect of heat-treatment of normal as well as nano-silver-impregnated Populus nigra, Populus deltoides, and Fagus orientalis on brittleness. Specimens were impregnated with 200 ppm water-based solution of nano-silver particles under 3 bars in a pressure vessel using empty-cell process. For heat treatment, both nano-silver-impregnated and normal specimens were kept for 24 hours at 1353 ºC; half of the specimens in random were continued heating for 4 more hours at 1853 ºC. Cluster analysis showed that nano-silver-impregnation would intensify the effects of heat treatment in species of higher densities; also, the effects of NS-impregnation would be more significant at higher temperatures. It may be concluded that although NS-impregnation would accelerate and enlarge the effects of heat treatment in solid woods, but more factors may also be involved in the final increasing or decreasing trend such as the species and density of the wood.

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