Abstract

MUNOZ-ACOSTA, Freddy  and  MORENO-PEREZ, Pablo A.. Skrinkages and physical properties of Acacia mangium Willd, Tectona grandis L. f. and Terminalia amazonia A. Chev, plantation wood from Costa Rica. Rev. Chapingo ser. cienc. for. ambient [online]. 2013, vol.19, n.2, pp.287-303. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2012.06.040.

Based on ASTM standards D 2395-02 and D 143-94, total and normal shrinkage in radial (RS), tangential (TS) and volumetric (VS) directions and the total and normal TS/RS ratio were determined in the plantation woods Acacia mangium Willd., Tectona grandis L.f. and Terminalia amazonia A. Chev. Also, physical properties such as basic specific gravity (BSG), SG_12% and SG_ovendry, green density (GD) and normal density (ND), fiber saturation point (FSP) and moisture content (MC) were determined. Some classification criteria, proposed by other researchers, were used to categorize the dimensional stability and physical properties of these species. Significant differences were found among the species for total RS, TS, VS and TS_total/RS_total, as well as for the physical properties BSG and FSP. The TS_total/RS_total ratio indicated that T. grandis has better dimensional stability. The linear regression (R²= 0.7769) indicated that FSP is a good indicator of VS_total magnitude. The plantation species of this study compared with those of the natural forest have similar dimensional stability but lower BSG.

Keywords : Basic specific gravity; density; fiber saturation point; moisture content; dimensional stability.

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