Natural Decay Resistance Of Indian Timbers.III. Heartwood Extractives of Sal (<I>Shorea robusta</I> Gaerin.) and Teak (<I>Tectona grandis</I> L.f.)

Abstract

A preliminary investigation on heartwood extractives of SAL and TEAK is reported. The timbers were subjected to various solvents successively and after extraction with each were tested for decay resistance. There was a progressive loss in decay resistance following each extraction, though this loss was different for different treatments and test fungi. It, therefore, appears that the general high decay resistance of both these timbers is due to the combined toxic effect of most of the fractions.