Evaluation of the quality of timber sorted according to different standards

Abstract

The expediency of conducting comparative studies of the assortment of dry sawn oak timber established according to different regulatory documents has been verified: by the current standard - DSTU EN 975-1-2001 and the standard cancelled in 2019 - GOST 2695-83. A methodology for conducting experimental studies of timber assortment has been developed and tested. It has been established that there is a certain correlation between the results of the evaluation of the quality characteristics of the investigated timber, in accordance with the requirements of the relevant regulatory documents. In particular, higher-grade timber according to GOST 2695-83 corresponded to higher grades according to DSTU EN 975-1-2001, but the presence of a different number of grades in the standards used, 5 in DSTU EN 975-1-2001 and 3 in GOST 2695-83, predisposes a certain redistribution of timber among the grades. The studied timber of grade 1 established according to GOST 2695-83 was redistributed into 3 grades (Q-FA, Q-F1a, Q-F1b) according to DSTU EN 975-1-2001, grade 2 timber established according to GOST 2695-83 was redistributed into 2 grades (Q-F1b, Q-F2) according to DSTU EN 975-1-2001, including the lowest quality, and grade 3 timber established according to GOST 2695-83 was also redistributed into 2 grades (Q-F2, Q-F3) according to DSTU EN 975-1-2001.