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By Jan F. Rijsdijk, Peter B. Laming (auth.)

In the process nearly forty years a number of researchers, at what was TNO's wooded area items learn Institute, presently the TNO Centre for bushes learn, carried out reports into the actual homes of wooden. the 1st reviews and calculations have been performed via Mr E. Prochaska, and then Mrs G.M.C. Koning-Vrolijk persisted the paintings. certainly Mrs Koning-Vrolijk wrote the Institute's first booklet (1962), an Eng­ lish model of which was once released in 1963 (3) at the celebration of FAO and IUFRO meetings held within the usa. Thereafter, the Institute's paintings was once carried on through Mr A. Govers, Mr J.F. Rijsdijk and Mr P.B. Laming. Their examine led to a moment ebook (Laming 1978) within which not just the mechanical houses but additionally the actual houses of forty eight wooden species have been defined. in the course of the bulk of this era technical aid used to be supplied by way of Mr J.C. Verwijs and extra lately through Mr L. van Brussel. After huge stories, the Belgian bushes info Institute additionally followed a similar study equipment as TNO so one can receive actual info on a few wooden species which have been of industrial curiosity to the Belgian industry yet which had now not been lined in TNO's experiences. The Belgian trees info Institute's recommendation to incorporate their learn effects, on a complete of 17 wooden species during this booklet, .was consequently gratefully accepted.

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Swelling t--~ tg E 18 0 :::J I I I I ," Q) I / adsorption 0. :§, , .. c. density (kg/nf) at oven-dry state nominal specific gravity Shrinkage/swelling av. min. max. 511 476 427 489 445 414 544 510 454 CV. c. c. c. between 7,5 and 11,0 %) 0,6% 1,2% radial tangential Longitudinal shrinkage (from green to oven-dry) (- test pieces) (extremely deviating values ( - test pieces) test pieces) deviating values av. -% -% -% min. -% -% -% max. c. about - %) min. max. av. ratio difference Remarks - test material of the Ardennes-region origin -% -% -% CV.

The moisture contents at the fsp may vary considerably; this is not the case, however, at low moisture contents. Table 3 lists the moisture contents during adsorption at 20% and 60% RH. 33% at 60% RH. There are a great number of publications on the sorption behaviour of wood, hysteresis and the fundamental backgrounds. The values obtained in this study for the different species confirm what is indicated in the literature: at about 5% the moisture in wood is bound monomolecularly, whereas at about 11 % it is bound bimolecularly .

This is demonstrated by many hysteresis determinations. 1 The relationship between the fibre saturation point and natural durability The moisture content at which the fibre saturation point (fsp) is reached depends on the wood species and may vary from 19% to more than 30%. Table 1 lists the moisture contents at the fsp of more than 80 wood species in addition to the natural durability of these wood species as indicated in the literature. To avoid any misunderstanding, the term "natural durability" must be dearly defined.

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