The aim of this article is to determine the distribution of Lithuanian pine wood according to the international strength classes and to establish correlations of roundwood and sawn timber viscous-elastic properties. At least 6 model trees from Scots pine (Pinus sylvestris L.) stands were selected in seven forest regions of Lithuania, representing typical growing sites. Comparative non-destructive methodology was used for the analysis of sawn timber taken from the model logs focused on modulus of elasticity, strength and the distribution into strength classes. The non-destructive tests were done using the Timber Grader MTG and Metriguard, used for measuring the log and sawn timber mechanical properties and bending machine. After performance of non-destructive log and sawn timber tests the static 4 – point bending test was done for boards out of tested logs. The comparison of modulus of elasticity of all static and dynamic devices with the actual timber bending strength was done after all the testings.

Keywords: Scots pine, wood strength, modulus of elasticity, non-destructive methods.