Your search resulted in 450 documents. Displaying 25 entries per page.
Preservative treatment of green timber by soaking in ammoniacal copper borate
1984 - IRG/WP 3292
Freshly sawn boards of radiata pine sapwood were preservative treated by soaking in ammoniacal copper borate. Optimum schedules were obtained by partially seasoning the boards for one week prior to treatment. This aided the absorption of preservative and reduced the required soaking time to approximately 2 hours. Complete boron penetration was obtained after one week of block storage under cover a...
P Vinden, A J McQuire
Thermotolerant moulds on timber during kiln drying
1980 - IRG/WP 1109
In recent years a special disease named the wood trimmer's disease has been observed with increasing frequency among saw mill workers. Particularly workers in the trimming department have been affected. The medical symptoms are usually high fever, ague headache, pain in muscles and joints. It was shown that the disease was of immunologic nature and caused by over-exposure to spores from m...
B Henningsson
Effect of post-treatment drying schedule on the modulus of elasticity of CCA-treated southern pine dimension stock using nondestructive methods
1987 - IRG/WP 3413
This paper describes the results from the nondestructive testing for modulus of elasticity (MOE) of southern pine (Pinus sp.) 2 x 6's treated with chromated copper arsenate and redried using three commercial kiln schedules. The data indicate that redrying CCA-treated southern pine dimension stock treated to above-ground retentions (4 kg/m³) has no deleterious effect on the MOE, regardles...
H M Barnes, S Moore
IRG/COIPM INTERNATIONAL MARINE TEST - to determine the effect of timber substrate on the effectiveness of water-borne salt preservatives in sea-water. Progress Report 11: Report of fourth inspection (3 years) in Italy
1981 - IRG/WP 471
The wood samples of Alstonia scholaris, Fagus sylvatica, Pinus sylvestris were submerged in the sea at Follonica, Italy, in Apri1 1977. Follonica, latitude 42°55' North and longitude 10°45' East, is situated on the Tyrrhenian coast. The recorded temperature varies from 13°C td 25°C, salinity 37- 38%. and pH about 8. The inspections were carried out after 6 months (10/1977), 1...
A Gambetta, E Orlandi
Wood preservation in Iran
1984 - IRG/WP 3270
The report sketches the history of the use of wood in Iran to the establishment of the country's national forest service and gives some figures for Iran's timber needs by the year 2000. Progress in wood preservation has been slow, although items such as railway sleepers and poles have been pressure treated since the first pressure impregnation plant was erected in 1932. Today the...
P Niloufari, R Cockcroft
The natural durability of five Indonesian timber species against marine borers - A field test in Indonesia
1981 - IRG/WP 474
This paper presents results of a natural durability field test using five species of Indonesian timbers against marine borers. An attempt is also made to assess any difference in durability between the lower and upper part of the trunks. Results of marine fungal identification, soft-rot assessment, and marine-borer assessment of CCA-treated test blocks will be reported in separate papers...
Suhirman, R A Eaton
Kiln drying of LSOP treated timber: rate of solvent evaporation, overpaintability and recovery of the solvent
1992 - IRG/WP 92-3711
The rate of solvent evaporation from LOSP treated timber dried in a kiln at 35°C has been investigated. Around 50% solvent removal has been found to be consistent with good overpaintability using a water based acrylic primer. It has been demonstrated that an activated carbon solvent recovery system is capable of removing all the solvent vapour from the outlet of a commercial joinery drying kiIn, ...
P Warburton, L B Sheard
A biochemical explanation for the observed patterns of fungal decay in timber
1980 - IRG/WP 1111
Experiments designed to compare the degree of localization of the cellulase enzymes of some white, brown and soft rot organisms are described. The site and nature of binding of the enzymes is discussed. The technique is ellution of mycelium grown in liquid culture with a variety: of agents including acetate buffer, carboxymethyl cellulose solution, borate/glycerol buffer and urea. The mycelium was...
N B Green, D J Dickinson, J F Levy
Leaching of copper-chrome-arsenic treated timber: Simulated rainfall testing
1996 - IRG/WP 96-50074
Six kiln dried radiata pine sapwood packs of timber were preservative treated with copper-chrome-arsenic preservative using a modified Bethell treatment schedule. The packs were then subjected to simulated rain leaching at specified periods after treatment. Higher chromium leachate was obtained when higher volumes of simulated rainfall were applied. Lower chromium leachate was obtained for timber ...
S Walley, P R S Cobham, P Vinden
IRG/COIPM INTERNATIONAL MARINE TEST - to determine the effect of timber substrate on the effectiveness of water-borne salt preservatives in sea-water. Progress Report 22: Report on the conditions of specimens at Sekondi, Ghana after 60 months
1986 - IRG/WP 4123
The results of the third inspection of CCA and CCB treated test panels exposed at Sekondi, Ghana in June 1980 are presented. None of the panels still in test, i.e. panels of Pinus sylvestris treated with CCA at 3 and 10%, Alstonia scholaris treated with CCA at 10%, Fagus sylvatica treated with CCA at 10%, and Erythrophleum ivorense and Mitragyna stipulosa both treated with CCB at 10%, shows any ex...
F F K Ampong, N Asare-Nyadu
The effect of acid rain on CCA treated timber
1990 - IRG/WP 3579
The effect of acid precipitation on the leaching of copper, chromium and arsenic from timber treated with different CCA preservatives was studied in the presence of three types of soil under simulated field conditions. Pine sapwood, embedded in soil, was subjected to simulated rainfall at three different levels of acidity. The CCA preservative formulations tested were:- American Wood Preservers&am...
R J Murphy, D J Dickinson
Wood preservation requirements in Queensland, Australia
1983 - IRG/WP 3227
In Queensland the preservative treatment and utilization of timber must comply with the Timber Users' Protection Act. Preservative retention levels and penetration patterns must be complied with. Analytical zones are specified for removing samples for chemical analysis of preservative retention. The required retention levels have been expressed as percent weight of oven dry wood weight. T...
L E Leightley, M J Kennedy
Wood preservation in Southern Africa
1984 - IRG/WP 3320
This report deals with the status of wood preservation in the countries of Southern Africa, namely Botswana, Lesotho, Mozambique, Namibia, South Africa, Swaziland and Zimbabwe. It includes some data on the timber production from the forests of these countries, as well as detailing the state of the timber products industries in South Africa which is the dominant country in the field in the sub-cont...
A Pizzi, W E Conradie, R Cockcroft
Monitoring a Timber Bridge in Norway
2004 - IRG/WP 04-40282
We have instrumented three different timber bridges in Norway for the Norwegian Public Roads Administration. The goal was to learn more about the properties of timber bridges. We have instrumented Evenstad Bridge, Daleråsen Bridge and the last year Flisa Bridge. All bridges are have creosoted glulam trusses and creosoted stress laminated deck. Evenstad and Flisa have an asphalt deck on top, while...
F G Evans
Tilting and vacuum treatment - two methods to obtain a non-dripping freshly treated timber
1989 - IRG/WP 3535
Modern impregnation plants are designed to prevent spread of impregnation solutions from the plant through leakage, etc. It is also important that freshly treated timber does not spread solutions through dripping on the storage area. To prevent this, the impregnation procedure is terminated with a vacuum period. In many plants in Sweden this period is minimized or even excluded to gain time. Inste...
I Johansson, M-L Edlund
Recycling and disposal of timber treated with waterborne copper based preservatives
1993 - IRG/WP 93-50008
Recycling and disposal technologies are briefly reviewed. Details are given of chemical extraction techniques suitable for recovery of copper from timber treated with a new copper based preservative, and traditional chromium based products. Details of thermal decomposition tests according to the DIN 53436 protocol under flaming and non-flaming conditions are given. The decomposition products were ...
J A Cornfield, S Vollam, P Fardell
Blue stain in timber in service. Preliminary results of the IRG collaborative tests to compare natural and artificial weathering
1978 - IRG/WP 286
The collaborative programme was initiated at IRG Meetings in Wildhaus, 1976. The six collaborators were BAM (Berlin), Cuprinol Ltd (UK), EMPA (Switzerland), GORI (Denmark), PRL (UK) and Imperial College (UK). Experimental plans were finalised in December 1976 and panels treated by Cuprinol Ltd early in 1977. Natural weathering was carried out by BAM, Cuprinol, EMPA, GORI and PRL during April-Septe...
A F Bravery, D J Dickinson
Protection of freshly felled timber against attack by bark boring insects
1981 - IRG/WP 1143
This report describes two experiments with the insecticide formulation Perigen, which contains the synthetic pyrethroid permethrin. At 0.2% w/v active ingredient individual logs were protected against bark boring beetles for 18 weeks. At 0.3% w/v active ingredients Perigen gave similar protection against insect attack to stacks of recently felled unbarked pine logs. This protection was at least eq...
J Dominik, P R Skidmore
Pollution in wood preservation - Aspects and problems
1973 - IRG/WP 55
In the field of wood preservation too, pollution problems have to be considered. They originate with the wood preservatives used. The extent of pollution differs widely with the type of preservative and the treatment process used. Per unit of impregnated timber, pollution will be lower if treatment is performed in treating plants than in distributed places. It will be highest for the old type Bouc...
H Willeitner
A review of the implementation of results-based standards for preservative treated timber
1999 - IRG/WP 99-20156
European standards for the specification of preservative treated timber are written in terms of the results achieved in the commodity by the treatment process. This is described in terms of penetration and retention of preservative. Results from a study on the commercial application of this approach in the UK show the difficulties associated with applying the new European standards; particularly w...
E D Suttie, A S Hughes, R J Orsler
Specifying preservative-treated resistant timber: Conforming to European Standards
2001 - IRG/WP 01-20235
The most common construction timbers used in the UK are of low natural durability and, generally, resistant to preservative treatment. These include species of spruce, hemlock and fir. However, their characteristically limited and non-uniform uptake of preservatives may still confer sufficient protection to give satisfactory durability performance in terms of biological resistance. This paper desc...
E D Suttie, A F Bravery, T B Dearling
Performance of preservative-treated timber commodities in above-ground service tests
1995 - IRG/WP 95-20064
Service tests established by NZ FRI are of commodities where treatment has been undertaken in commercial plants and although such data as preservative uptake of individual items is recorded and sample analysis undertaken, material is usually "run-of-mill" for the commodity being treated. The NZ FRI Service Test database includes a wide range of preservative/species combinations in virtually all ab...
M E Hedley, D R Page
Major insects attacking timber used for building purposes and a practical approach for their control
1990 - IRG/WP 1449
Lignocellulosic materials like wood, bamboos, palmyra palms, reeds, leaves and grasses have been the oldest materials used by human beings. Although with the rapid pace of industrialisation, specially in several western countries, wood began to be replaced with alternative materials like cement, steel etc. yet its use has not vanished even in highly developed countries. Some of the reasons for thi...
V R Sonti, B Chatterjee
Administration of wood preservative usage in New Zealand
1977 - IRG/WP 395
Principal administration of the preservative treatment of timber in New Zealand is by the Timber Preservation Authority (TPA). The TPA was established in 1955 by Act of Parliament and is under the jurisdiction of the Minister of Forests who appoints its members. Its field staff are Forest Service employees. The Authority comprises twelve members and includes representatives of timber trade associa...
M E Hedley
Protection for whole-of-house timbers from subterranean termites in Australia
2005 - IRG/WP 05-20315
A field study was designed to increase maximum protection of whole-of-house timbers against subterranean termites. Concrete slab and suspended floor simulated houses were constructed using untreated and treated (slow acting toxicants) timber frames. The treated and untreated timber structures within the simulated houses were exposed with or without soil chemical and/or physical barriers in the fie...
B M Ahmed, J R J French, P Vinden, P Blackwell, J Hann