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Disposal of treated wood - Canada
1990 - IRG/WP 3563
It is estimated that treated wood removed from service each year in Canada contains about 16,000 tonnes of creosote, 1000 tonnes of pentachlorophenol and 245 tonnes of CCA or ACA. The amount of CCA treated wood for disposal is expected to increase more than ten-fold by the year 2020. At present, most treated wood is disposed of in landfills, burned (creosote only) or recycled as other products. Other approaches to reduction, reuse, recycling and disposal are discussed.
P A Cooper


Estimation of the population of a sound colony of Coptotermes lacteus (Froggatt)
1988 - IRG/WP 1353
Selecting an area with a high termite hazard is deemed essential in locating field sites in order to screen potential termiticides and wood preservatives. Yet, quantifying termite populations in such sites remains imprecise. There are major problems associated with estimating populations of termites in mound colonies (either free-standing or in trees), and these are briefly discussed. In this paper we estimate the population of a mound colony of Coptotermes lacteus as 3.06 x 105. The estimate relates to foragers collected at baits that had been inserted into the mound. The technique adopted, "removal sampling", did not destroy the integrity of the mound nor incur unnecessary expense.
D M Ewart, J R J French


Production of preservative-treated wood in some countries
1990 - IRG/WP 3598
This report presents figures of the production of preservative-treated wood and wood treated with anti-stain chemicals in 26 and 20 countries respectively from all over the world.
J Jermer


Estimates of wood-consumption rates by termites
1983 - IRG/WP 1201
Effects of 2 components; termite-biomass and experiment duration on estimates of wood-consumption rates (mg wood/g termite/day), were examined. Three models; (1) no mortality, (2) linear mortality and (3) nonlinear mortality were used to calculate mean standing-crop biomass of termites. Model (1) predicted a significantly lower wood-consumption rate than those based on models (2) and (3). No significant difference was detected between rates based on models (2) and (3) when data within defined experiment duration were used.
N-Y Su, J P La Fage


Effect of pretreatment of wood surfaces with a copper monoethanolamine solution on the natural weathering performance of semitransparent stains
2019 - IRG/WP 19-40881
Semitransparent stains for wood products are favored for outdoor applications in Japan because these finishes do not hide the wood grain. However, the photoprotective effects of wood surfaces are low, therefor there is a need to improve the weathering performance. We examined the natural weathering performance of semitransparent stains on wood pretreated with a copper monoethanolamine solution (CuA) to improve its photostability. Untreated and pretreated with CuA Japanese larch (Larix kaempferi), Todo fir (Abies sachalinensis), and Japanese cedar (Cryptomeria japonica) wood panels were finished with semitransparent stains containing a different type of resins and colours and exposed outdoors in Hokkaido, Japan for 24 months. Results from the visual assessment and statistical analysis using the Kaplan-Meier estimates of survival analysis showed that the formation of cracks predominantly observed and the stains performed better on pretreated than untreated panels. We conclude that the natural weathering performance of semitransparent stains can be enhanced by using CuA pretreatment. However, further studies would be needed to clarify the reason why the effectiveness of CuA pretreatment differ from resin type and/or wood species.
S Isaji, H Shibui, Y Hirabayashi