Caracterização tecnológica da madeira de Myracrodruon urundeuva em diferentes classes diamétricas

Abstract

This study aimed to determine the technical characteristics of Myracrodruon urundeuva wood in different diameter classes. For this, it was determined the heartwood/sapwood proportion and the basic density was quantified by the ABNT (11941: 2003) and the shrinkage by the ABNT (7190: 1997). The values for the percentage of core diameter classes ranged from 4.42 to 21.15%, while for the sapwood ranged from 78.85 to 95.56%. The heart/sapwood relationship did not effect on the different diameter classes. The percentage of core decreased from bottom to top, while the percentage of sapwood increased along the longitudinal position. The core relationship/sapwood decreased from bottom to top. There was no significant difference in specific gravity between the diametric classes. The basic densitydecreased from the base to the position of 75% and was subsequently rising to the top. For the linear shrinkage, were observed lower values for diameter class between 25.9 to 32.9 cm. As for the anisotropic coefficient, it was statistically equal between the diametric classes. The Myracrodruon urundeuva wood can be classified as normal anisotropy factor.