| Abstract: | Favourable toxic values of the water-insoluble effective substance Bis-(N-Cyclohexyldiazeniumdioxy)-copper, CU-HDO, for wood-destroying basidiomycetes and soft-rot resulted in the development of water-soluble, chromium-free wood preservative products. Biological tests of water-born formulations based on Cu-HDO showed threshold values after leaching, considerably lower than the values of conventional copper-/chromium-containing wood preservatives, especially for brown rot fungi. Examinations in application engineering with pine and spruce timbers indicated that penetration and distribution of the wood preservative come up to the requirements of an application in hazard class 4. Toxicological values and data on environmental aspects, especially concerning disposal of the impregnated wood, show that this formulation is an interesting alternative to wood preservatives based on conventional copper/chromium compounds. |
