Relative performances of DNBP and CCA wood preservatives in accelerated decay tests

IRG/WP 3496

W H Schnippenkoetter, L D Abraham, A A W Baecker

The effectiveness of 2-sec-butyl-4,6-dinitrophenol (DNBP) was compared with that of CCA. Test blocks of Pinus patula and Eucalyptus grandis were impregnated to precisely known retentions of approximately 3, 6, and 10 kg/m³ CCA and solvent-borne DNBP respectively. They were then challenged in decay tests comprising soil burial and exposure to monocultures of Chaetomium globosum, Coriolus versicolor and Coniophora puteana. Decay was monitored by determining weight losses produced in the blocks over 15 weeks. Overall, DNBP performed more successfully than CCA. Specifically, a toxic threshold of 7.4 kg/m³ DNBP was shown in soil-buried Eucalypt, whereas this wood failed in soil even when treated to 10.43 kg/m³ CCA. A mycocidal effect of DNBP on Coniophora puteana was detected. Comparing costs, effective wood preservation using DNBP was cheaper than using CCA, and such costs would be significantly lowered with the advent of less toxic water-borne DNBP.


Keywords: DNBP; CCA; PERFORMANCE; ACCELERATED DECAY TESTS; PINUS PATULA; EUCALYPTUS GRANDIS; SOFT ROT; WEIGHT LOSS; BASIDIOMYCETES

Conference: 88-04-24/29 Madrid, Spain


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