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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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954 Tilman Hahn, Konrad Botzenhart, Fritz Schweinsberg, Gerhard Volland<br />

14.14.2 ROLE OF SOLVENTS<br />

14.14.2.1 Occurrence<br />

Various solvents are added to wood preservatives. Only a limited number <strong>of</strong> wood preservatives<br />

are authorized by governmental agencies, e.g., in Germany “Institut für Bautechnik<br />

(DIBt)”. 2 But there is a large grey market for wood preservatives other than the authorized<br />

substances. As a result, a large variety <strong>of</strong> solvents can occur in wood preservatives.<br />

Different systems <strong>of</strong> classification are used worldwide. In Germany, authorized wood<br />

preservative substances are published in an index <strong>of</strong> wood preservatives<br />

(“Holzschutzmittelverzeichnis”) 2 which is elaborated by the DIBt and the central German<br />

environmental authority (“Umweltbundesamt”).<br />

A systematic survey <strong>of</strong> wood preservatives is shown in Table 14.14.1, including wood<br />

preservatives containing solvents. <strong>Solvents</strong> are normally found in wet systems <strong>of</strong> wood preservatives.<br />

Commonly used solvents are substances which are applied in connection with<br />

normally used binders (aldehyde resins, acrylates and polyurethanes). Water or the appropriate<br />

solvents are added to binders.<br />

Table 14.14.1. Systems <strong>of</strong> wood preservatives<br />

Purpose and base Terms Active components<br />

Water-soluble agents<br />

as preventive<br />

treatment against<br />

fungi and insects<br />

“CF-salts” chromium and fluorine compounds<br />

“CFA-salts”<br />

alkali fluorides, alkali arsenate, and bichromate<br />

(no longer permitted)<br />

“SF-salts” silic<strong>of</strong>luorides<br />

“HF-salts” hydrogen fluorides<br />

“B-salts” inorganic boron compounds<br />

“Single CK-salts” copper salts, bichromate<br />

“CKA-salts”<br />

copper salts, bichromate with arsenic<br />

compounds<br />

“CKB-salts” copper salts, bichromate with boron compounds<br />

“CKF-salts”<br />

copper salts, bichromate with fluorine<br />

compounds<br />

“CFB-salts” chromium, boron and fluorine compounds<br />

collective group<br />

other compounds, e.g., bis(N-cyclohexyldiazeniumdioxyl)-copper<br />

tar oil preparations distillates <strong>of</strong> bituminous coal tar (carbolineum)<br />

preparations<br />

containing solvents<br />

organic fungicides and insecticides<br />

Oily agents as<br />

preventive treatment<br />

against fungi and<br />

insects<br />

pigment-free preparations<br />

containing binders and solvents<br />

preparations with stained<br />

pigments containing solvents<br />

special preparations only used in<br />

stationary installations<br />

organic fungicides and insecticides<br />

organic fungicides and insecticides<br />

organic fungicides and insecticides<br />

preparations containing coal tar oil<br />

organic agents, special distillates containing<br />

coal tar oil, solvents and pigments<br />

Preparations used for pastes<br />

special applications wood preservatives used in particle board in manufacturing plants<br />

agents used as preventive treatment against insects contain organic insecticides

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