Your search resulted in 243 documents. Displaying 25 entries per page.
Service Life Prediction of Wood Claddings by in-situ Measurement of Wood Moisture Content
2004 - IRG/WP 04-20304
The Danish Technological Institute is in co-operation with industry partners running a project aiming at predicting the service life of different wood protecting systems.
The project focuses on examining the moisture reducing effect of different wood claddings and the ability to maintain the appearance of the surfaces, when the wood is used in service class 3.
A façade construction is exposed t...
B Lindegaard, N Morsing
The susceptibility of acetylated Pinus radiata to mould and stain fungi
1992 - IRG/WP 92-1548
The aim of this investigation was to determine the effect of 5, 10, 15 and 20 percent acetylation weight gains on the susceptibility of Pinus radiata sapwood to mould and stain fungi, and to establish if an acrylic paint, an oil-based stain and a water repellant gave superior protection from fungal growth on wood treated to 20% acetylation weight gain, compared to untreated wood. One treatment set...
R N Wakeling, D V Plackett, D R Cronshaw
Defacement of freshly sawn Corsican pine lumber by sapstain and mould fungi and the influence of arthropods
1997 - IRG/WP 97-10227
In a trial to study the arthropods associated with sapstain and mould fungi, freshly sawn Corsican pine (Pinus nigra var. maritima (Aiton) Melville) boards were block stacked at a local sawmill. Each stack was constructed in a nest arrangement with smaller boards in experimental tanks, positioned in the centre of the stacks. Boards were converted from a stock of sawlogs at monthly intervals, to pr...
N J Strong, J F Webber, R A Eaton
Weathering trials on natural wood finishes in New Zealand
1986 - IRG/WP 3383
The weathering properties of various transparent and semi-transparent exterior finishes for New Zealand-grown radiata pine are currently being examined. After 12 to 16 months' weathering, unpigmented water repellents have failed to provide satisfactory protection from weathering under field test conditions. With the exception of two formulations, penetrating oil-based stains are already s...
D V Plackett, C M Chittenden
Assessment of the effects of rentex remedial treatment on some wood pole inhabitant micro-organisms
1994 - IRG/WP 94-30053
The effects of a remedial ground-line treatment using Rentex, a stabilised paste containing a mixture of fluoride and dichromate salts, on the micro-organisms inhabiting a sample of some 160 creosoted, on-line, electricity distribution poles, have been investigated as part of an appraisal of the efficacy of this remedial treatment. Half of the poles were treated and the other half used as controls...
D C R Sinclair, G M Smith, A Bruce, H J Staines
The relationship between preservative type and surface degrade in Pinus radiata
1980 - IRG/WP 3158
Samples of Pinus radiata D. Don were impregnated with one of two preservative types, a copper chrome arsenic salt and a light organic solvent preservative. The panels were exposed to the weather for 4-5 years at a site near Sydney, Australia. Macroscopic and microscopic examinations showed different rates and patterns of weathering between the samples treated with each preservative and an untreate...
R S Johnstone, R K Bamber
Surface characteristics of wood treated with various AAC, ACQ and CCA formulations after weathering
1991 - IRG/WP 2369
Wood samples treated with various alkylammonium compounds (AACs) as well as ammoniacal copper quat (ACQ) and chromated copper arsenate (CCA) have been studied in accelerated weathering experiments. Microscopic examination of the surfaces of these samples after exposure in a weatherometer revealed several different changes. Samples treated with didecyldimethyl ammonium chloride (DDAC) show consider...
L Jin, K J Archer, A F Preston
Biodetioration and strength reductions in preservative treated aspen waferboard
1983 - IRG/WP 2195
Experimental aspen waferboards, bonded with liquid or powdered phenol formaldehyde resins and treated by various methods with a wide selection of preservatives, were tested for fungal resistance in accelerated laboratory trials. Mold growth on the surface as well as weight and strength losses due to the actions of decay fungi were determined. Testing of board strength after decay in high and moder...
E L Schmidt, H J Hall, R O Gertjejansen, R C De Groot
Screening of bacteria, yeasts and Trichoderma isolates for antagonism toward stain and mould fungi on agar media and wood
1999 - IRG/WP 99-20159
A screening programme of soil bacteria for antagonism toward mould and wood stain fungi was undertaken on 8 types of agar-based media by application of several bacteria to each plate. The rapid screening method was subsequently verified by testing antagonism of the most promising bacteria on Scots pine sapwood. Most of the 64 bacterial showed antagonistic effects on certain media against individua...
C Payne, A Bruce
Japanese standardized method for evaluating effectiveness of anti-sapstain and anti-mould chemicals
1988 - IRG/WP 2299
Japan Wood Preserving Association established a method for testing effectiveness of chemicals against sapstain and mold fungi on wood in 1979. The method is concerned with a laboratory technique using small timber specimens (20 x 50 x 3 mm³), petri dish and 5 test fungi. Effectiveness of each candidate chemical is evaluated on the basis of the relative resistance to sapstain and mold fungi which ...
K Tsunoda, K Nishimoto
Moisture distribution in coated wooden panels. Studies of moisture dynamics by computerized axial tomography
1992 - IRG/WP 92-2413
Certain modern coatings have been held responsible for the rot damages in wood sidings, which have, during the past few years, appeared at an increasing extent in Scandinavia and which have occurred rather soon after the application of the coating. In this study, the moisture excluding effect of different coating systems intended for sidings have been studied with the help of an X-ray technique, c...
J Ekstedt, L O Lindgren, S Grundberg
Surface checking of CCA-treated radiata pine decking timber exposed to natural weathering
2000 - IRG/WP 00-40165
A field trial was established at four locations in Australia to assess the effect of CCA and CCA-wax treatment on the checking (cracking) of radiata pine decking timber exposed to natural weathering. Untreated decking timber and timber that had been pressure treated with water acted as controls. After 1 year's exposure the number and sizes of checks occurring in treated timber and control...
P D Evans, P J Beutel, C F Donnelly, R B Cunningham
Potential toxicants for controlling soft rot in preservative treated hardwoods. Part 2: Laboratory screening tests using sawdust
1977 - IRG/WP 2101
A technique is described for the rapid screening of toxicants against microorganisms, represented by the brown rot, Gloeophyllum trabeum, and a natural inoculum from soft rotted wood. Sawdust, in this case from sapwood of Eucalyptus maculata, is pretreated with the candidate formulation and moistened before inoculation. Visual scoring of growth can be used to discriminate suitable candidates as ea...
J D Thornton
Surface Barriers for Protection of Culture and Heritage Wooden Objects from Insect Attack
2004 - IRG/WP 04-40286
Anoxic treatment is an environment friendly procedure for eradication of wood boring insects in wooden objects of cultural and historical heritage. However, after the anoxic treatment, wooden antiques remain susceptible to further insect attacks. Possible protection against insects could be provided by the so-called post-repression protective barriers. Potential coating materials for such barriers...
M Petric, M Pavlic, B Kricej, M Humar, F Pohleven
Surface protection of wood with titanium, zirconium and manganese compounds
2005 - IRG/WP 05-30376
Thin radiata pine veneers were treated with a range of titanium, zirconium and manganese compounds and exposed to natural weathering. Veneer weight and tensile strength losses were used to assess the protective efficacy of the compounds. The oxidative manganese compounds potassium permanganate and manganic acetate restricted both weight and tensile strength loss of treated wood veneers during weat...
K J Schmalzl, P D Evans
The degradation of wood surfaces by dilute acids
1985 - IRG/WP 3326
Thin radial/longitudinal sections(~100 µ) of Corsican Pine (Pinus nigra) and Lime (Tilia vulgaris), were exposed to Sulphuric, Sulphurous, nitric, acetic, and formic acid at 40°C in the pH range 2-6. After about 3 months exposure to Sulphuric, nitric, acetic and formic acid at pH 2.0 Pine lost some 20-25% of its tensile strength. Losses in tensile strength due to sulphurous acid were greater bei...
P D Evans, W B Banks
Permeability measurements on surface layers for detecting wood with abnormally high permeability
1988 - IRG/WP 2298
Wet storage of timber during the warm period of the year may lead to an increased permeability of the wood, an undesirable phenomenon for several wood industries and also for many end-uses. Neither before nor after drying, such wood with "wet storage damage" can be visually distinguished from wood with a normal permeability. A non-destructive method for inspecting the permeability of surface layer...
J B Boutelje, G Hägglund
Durability of some alternatives to preservative treated wood
2004 - IRG/WP 04-30353
The environmental discussion in Sweden has lead to an increasing use of naturally durable domestic wood species and wood treated according to alternative methods for use above ground. A number of these alternatives have been tested according to field- and laboratory tests and compared to wood treated with preservatives for above ground use. Seven untreated wood species, four alternative wood treat...
M-L Edlund
Quantification of creosote migration down wooden poles and the prevention of its depletion during flood irrigation
1994 - IRG/WP 94-50032
Polyethylene field liners heat-shrunk onto soil-contact surfaces prevented decay of creosote-treated Eucalyptus grandis vineyard poles under flood-irrigation. The present work quantified losses of creosote from these poles after six and 24 months' service. After six months' service the mean creosote retention of unlined poles above the ground line was 12.62% (m/m dry wood), with ...
M Behr, A A W Baecker
Less pollution due to technical approaches on accelerated steam fixation of chromated wood preservatives
1988 - IRG/WP 3487
Steaming of freshly treated wood at 100°C to 120°C initiates a spontaneous fixation of copper-chromate-containing wood preservatives. For the performance, a suitable anticorrosive equipment is necessary. Good results can be achieved using a separate steaming equipment which allows a rapid heating of the wood. While warming-up, in the wood some preservative solution extends and can be partly extr...
H Willeitner, R-D Peek
Preliminary observations of the effect of growth ring orientation on the surface checking of flat sawn Southern pine decking
2005 - IRG/WP 05-20313
Checking in decking timber is a serious defect and methods of reducing its severity are required to ensure that wood can compete with alternative decking materials. The first aim of this research was to test the hypothesis that flat sawn Southern pine decking boards with growth rings oriented concave to the exposed surface will develop less severe checking when exposed outdoors than similarly expo...
K Urban, P D Evans
Anti-sapstain chemicals for diffusion treatment of rubber wood
1986 - IRG/WP 3367
Performance of Sinesto B and Akzo EN 494, two formulated products of alkyl ammonium compounds, was tested as fungicidal additive in the boron solution to control mould and stain during diffusion storage of rubber wood. Sinesto B at 2.0% (a.i.) concentration has given good control over mould and its protection against sapstain was only satisfactory. Akzo EN 494 at 0.7% (a.i.) concentration has give...
R Gnanaharan
Upgrading the fungal resistance of OSB
1999 - IRG/WP 99-40138
There is a perception that oriented strand board (OSB) is less resistant to fungl than plywood under conditions of moderate exposure to moisture. Douglas fir-faced plywood (DFP) has been suggested as a benchmark for acceptable durability under such conditions. This project was initiated to determine the minimum level of low-toxicity chemical treatment needed to upgrade the fungal resistance of OSB...
P I Morris, J E Clark, D Minchin, R Wellwood
Mould growth and permeability in relation to wet-storage
1989 - IRG/WP 1414
The positive influences of wet-storage of roundwood to avoid attack by blue stain fungi and insects and to avoid cracking of wood during storage are well documented. Comparatively little information is, however, available on the effects on microbial susceptibility of the material after the storage period. The permeability of the wet-stored and the non-wet-stored material was determined. Wood block...
J Bjurman, E L Holappa
The effect of stack height on the performance of preservatives used for the prevention of sapstain on seasoning wood
1997 - IRG/WP 97-10192
The performance of three anti-sapstain preservatives was investigated under field conditions in south east England. The preservatives under test were: copper-8-quinolinolate (Mitrol PQ8) trimethylalkylammoniumchloride and sodium hexanoate (Sinesto B) and chlorothalonil (Tuff Brite). The preservatives were tested on Corsican Pine grown in south east England. The field trial was set up to investigat...
J R Williams, D J Dickinson, J F Webber