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Comparação de métodos de determinação da densidade básica em Madeira

A comparative study of six methods for determination of basic specific gravity (freen volume basis) was accomplished. These methods were: a) immersion or displacement - based on the weight of the fluid displanced (M1) ; b) measurement of the wood specimen dimensions using a caliper (M2); c) immersion - based on the weight variation of the specimen (M3); d) determining volume by th difference in the sand level in a graducted in the water level in a graduated cyliinder. Jatoba (Hymenaea courbaril L.) was the tropical hardwood species used in this study. A total of 240 specimens were used in this study with 120 cut from heartwood species used in this study. A total of 240 specimens were used in this study with 120 cut from heartwood and 120 from sapwood.

Methods M1, M3 and M5 were statistically similar results, better reatability, and were not influenced by dimensions of the specimens.


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