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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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14.14 Lumber and wood products 953<br />

Table 14.13.2. Reported solvent transfers from the iron and steel plants in 1995 [Data<br />

from Ref. 2]<br />

Solvent Amount, kg/year Solvent Amount, kg/year<br />

benzene 3,000 N-methyl-2-pyrrolidone 11,500<br />

n-butyl alcohol 1,400 polycyclic aromatic compounds 3,820,000<br />

cresol 12 tetrachloroethylene 20,000<br />

dichloromethane 14,500 1,2,4-trimethylbenzene 3,600<br />

ethylene glycol 197,000 trichloroethylene 165,000<br />

ethylbenzene 550 toluene 11,500<br />

methanol 25 xylene 14,000<br />

methyl ethyl ketone 66,000<br />

14.14 LUMBER AND WOOD PRODUCTS - WOOD PRESERVATION<br />

TREATMENT: SIGNIFICANCE OF SOLVENTS<br />

Tilman Hahn, Konrad Botzenhart, Fritz Schweinsberg<br />

Institut f�r Allgemeine Hygiene und Umwelthygiene<br />

Universit�t T�bingen, T�bingen, Germany<br />

Gerhard Volland<br />

Otto-Graf-Institut, Universit�t Stuttgart, Stuttgart, Germany<br />

14.14.1 GENERAL ASPECTS<br />

Wood preservation is based on various fundamental principles, e.g., construction aspects<br />

such as exposure to humidity, selection <strong>of</strong> different types <strong>of</strong> wood products according to<br />

their durability, and chemistry <strong>of</strong> wood preservatives. Important groups <strong>of</strong> chemical wood<br />

preservatives are water-soluble and solvent-based substances. 1<br />

The main requirements <strong>of</strong> chemical wood preservatives are: 1<br />

• Stability, especially chemical stability.<br />

• Resistance to environmental conditions, e.g., light or heat.<br />

• Penetration into the wood products.<br />

• Effectiveness against wood attacking agents (e.g., insects, fungi, bacteria).<br />

• Compatibility with other construction components, e.g., paints, adhesives, and<br />

fasteners.<br />

• Construction aspects, e.g., corrosion.<br />

• Minimal environmental impact, e.g., minimum emissions or minimum<br />

environmental pollution.<br />

• Ability to work with a range <strong>of</strong> wood products.<br />

• Case applications, e.g. fundamental differences <strong>of</strong> indoor and outdoor coatings.<br />

• Having favorable visual aspects, e.g., surface properties, color, uniformity,<br />

influence on grain pattern, etc.<br />

All requirements cannot be fulfilled completely by the various wood preservatives.<br />

Therefore wood preservatives should be selected according to the particular case.

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