Your search resulted in 3346 documents. Displaying 25 entries per page.
Timber deterioration and its prevention in marine environment
2005 - IRG/WP 05-10559
Wood-borer activity is an established fact in Mumbai harbour that leads to severe deterioration of timber. In order to prevent the deterioration caused by wood borers three resin preservatives containing Zinc borate, Organo-copper polymer (4 wt% Cu) and Organo-Tin polymer Copoly(TBTM-MMA) were used for timber treatment. Test panels were treated using standard method and the...
B S Swami, M Udhayakumar, P Kumar, A B Samui
Marine trials with water-borne salts and organotin compound
1986 - IRG/WP 4128
Pinus sylvestris blocks treated with water-borne salts (CCA, CCB, CCF) and organotin compounds (TBTO, TBTCl) were submerged in the sea at Follonica station. The results obtained after 12 years of immersion are presented. The samples treated with CCA, CCB and CCF at the lowest concentration (2%) were destroyed after 7-9 years and the samples treated with CCB and CCF at the highest concentrations (4...
A Gambetta, E Orlandi
Water-storage for improving the permeability of sugi (Cryptomeria japonica D. Don)wood
1999 - IRG/WP 99-40129
The viable bacterial counts in sapwood and intermediate wood of sugi bolts increased immediately after floated in a fresh water pond. Bacterial invasion into the heartwood was not detected apparently during water-storage for 36 weeks, although a few bacterial species have inhabited in freshly-cut heartwood samples. The bacterial species isolated from the water-stored bolts were almost Gramnegative...
S Ohta, S Doi
A comparison of the migration behaviour in soil of different waterborne wood preservatives and their leachates
1997 - IRG/WP 97-50091
Lysimeter tests were carried out on water-soluble wood preservatives and on wood preservative components leached out of impregnated wood. The purpose of these tests was to determine the extent to which the migration behaviour of environmentally relevant ions in the soil is influenced under comparable conditions. The results clearly show that the groundwater is especially at risk when wood preserva...
E Melcher, R-D Peek
Acceleration of boric acid uptake into the subterranean termite, Coptotermes formosanus Shiraki using steamed larch wood
2000 - IRG/WP 00-10353
Laboratory tests were done to measure the efficacy of addition of steamed larch (Larix leptolepis (Sieb. et Zucc.) Gord.) heartwood extracts for the uptake of boric acid against the termite, Coptotermes formosanus Shiraki. Paper discs were treated with the water-soluble fraction obtained from hot-water extracts of steamed larch wood (S-Water) with or without 0.01-2.0% boric acid, followed by expos...
W Ohmura, S Doi, S Ohara
A review of incising as a means of improving treatment of sawnwood
1994 - IRG/WP 94-40019
The use of incising, perforation of the wood surface, is increased because of the need to treat refractory wood species. This paper reviews the development of incising and shows how the required incising patterns can be determined and specified. Most of the development has been in the area of toothed-roller incisors because of their rapid throughput. Needle, Laser, drill and water jet incisors hav...
P I Morris, J J Morrell, J N R Ruddick
Screening techniques for potential wood preservative chemicals. Proceedings of a special seminar held in association with the 10th Annual Meeting of the IRG, Peebles 1978. Report No 136, 1979
1980 - IRG/WP 2138
This paper continues following issues:
I. SCREENING INSECTICIDES
1) R W Berry (BRE/PRL, UK): Screen testing of insecticides for use in remedial wood preservatives.
2) D J Cross (FRI, New Zealand): Rapid screening of contact insecticides for use on forest products.
3) C R Coggins; A Forsyth; A E Glaser (Rentokil, UK): Experience in the use of indicative screening techniques for termiticides.
...
Anonymous
Proposing innovative technologies in the control of dry-wood insects
1985 - IRG/WP 1262
This paper discusses the social-economic problems involved in the biological evaluation of dry-wood insects with particular reference to Nigeria. It also discusses prospects of applying non-conventional methods of control against such insects, integrating these with the conventional preservatives as a control strategy. This discussion follows attempts made to identify the major dry-wood insects in...
M O Akanbi
Treatment of refractory timbers
1993 - IRG/WP 93-40001
Worldover crisis of wood is being felt due to the global environmental problems. Wood preservation technology plays a good role in curtailing the demands of wood for replacement by prolonging the service life of the timber and thus indirectly helps in saving the environment. Some species of timbers which could not be treated to the desired level by virtue of their refractory nature by any of the c...
I Dev, S Kumar
A suggested method to ascertain the toxicity of wood preservatives against the house longhorn beetle
1976 - IRG/WP 271
This abstract is given to let IRG members know about a method sometimes used in the Institute for Wood Technology in Sarajevo for obtaining rapid information on the toxicity of insecticides and ready made wood preservatives against the house longhorn beetle, which is the most common insect found attacking timber roof constructions in houses in Yugoslavia. In this method, 8-10 months' old ...
N Vidovic
Losses of preservatives from treated wood during service. Results from a questionnaire
1994 - IRG/WP 94-50031
From environmental as well as from performance point of view it is of interest to know how much of the preservatives in treated wood that is leached out or evaporated from the wood during service. Many laboratory studies are carried out on leaching from small samples in distilled water or water with different pH. These studies give a good picture of the relative leaching from wood treated with dif...
M-L Edlund
Durability of heat-treated wood
1999 - IRG/WP 99-40145
Heat-treated wood from the French process were laboratory tested against decay using agar block test and a modified soil block test. Water absorption, bending strength, lignin content and acid number were also determined to evaluate the effect of heat treatment. Heat treated samples exhibit a higher lignin content and a lower acid number compared to untreated control indicating the degradation of ...
D P Kamdem, A Pizzi, R Guyonnet, A Jermannaud
Determination of chlorine-containing wood preservatives in art objects using Micro-XRF
2003 - IRG/WP 03-20266
The applicability of a mobile energy-dispersive micro X-ray fluorescence (μ-XRF) spectro-meter for the analysis of organochlorine-containing wood preservatives in art objects was tested. Information about the relative degree of contamination and the efficacy of detoxification measures with emulsive solvent systems can be gained using the intensity of the chlorine signals. μ-XRF t...
J Bartoll, A Unger, S Krug, K Püschner, H Bronk
Wood Preservation in the United Kingdom
1979 - IRG/WP 385
This is only the first of several reports in English currently being prepared about wood preservation in Europe. The report deals with the extent of industrial impregnation and the number of impregnation plants in use today in Great Britain. Timbers which are treated for various end uses and their life expectancies are discussed. The market for wood preservatives, the size of the motorway fencing ...
R Cockcroft
Performance of different treatments and finishes on wood out of ground contact. Preliminary results
1984 - IRG/WP 2221
Pinus and Eucalyptus L-joints treated with CCA, a water dispersable PCP and untreated ones were painted according to seven different finish's schedules and exposed at two sites in State of Sao Paulo. After ten months of exposure, it was possible to verify that preservative treatment improve the performance of both wood and finish. It was also possible to observe that wood substrate, prese...
S Milano
Comparison between two laboratory test methods for determining the effectiveness on wood preservatives against blue stain in fresh wood
1987 - IRG/WP 2289
Most of the work done on determination of the effectiveness of new formulae for treating fresh wood against blue stain have been focussed on their use in the manufacture of saw timber. This work explains two laboratory methods, one which simulates the working and climatological conditions of factories making packages for fruit and vegetables in the Spanish Levante, showing that contamination of wo...
A M Navarrete, M T De Troya
Emissions from the combustion of wood treated with organic and inorganic preservatives
1994 - IRG/WP 94-50019
Wood waste and industrial wood residues often contain various preservatives. The waste management for these residuals can be recycling, deposition or combustion. Among the three possibilities, combustion seems to be the most efficient way of usage. To obtain more information about the emission properties of treated wood, different materials were incinerated in different furnaces after mixing with ...
T Salthammer, H Klipp, R-D Peek, R Marutzky
The registration of wood preservatives in Canada
1977 - IRG/WP 394
The Pest Control Products Act in Canada is a part of Federal Agricultural legislation affecting chemicals for wood protection. Other parts of Federal legislation include Canadian Fisheries Act, Fed. Food and Drug act, Environmental Contaminants Act, Clear Air Act, Navigable Waters Protection Act and the Criminal Code Section 165. Some of the main excerpts from the Pest Control Products Act are as ...
J Rak, J K Shields
Kinetics and mechanism of fixation of Cu-Cr-As wood preservatives. Part 6: The length of the primary precipitation period
1975 - IRG/WP 359
The end of the primary precipitation fixation period of CCA preservatives coincides with the first peak in pH versus time. This offers a simple way of estimating the duration of the period. The duration is determined by a number of factors and their interactions, the most important of which are: wood species (anatomy, natural pH, accessibility of reducing agents), preservative type, preservative c...
S-E Dahlgren
Leaching amount of wood preservatives from treated wood in different size during outdoor exposure for 6 months
2000 - IRG/WP 00-50160
Eighteen impregnated specimens with CCA, ACQ, and BAAC preservatives were subjected to a outdoor leaching test. Test specimens, 10 x 10 x 25 cm3, 5 x 10 x 25 cm3, 2 x 10 x 25 cm3 in size, were cut from Japanese cedar (Cryptomeria japonica). Both of end surfaces were sealed with a silicone sealer in the half number of specimens. Total leaching amounts of copper from the open-end ACQ specimens of 10...
K Yamamoto, S Motegi, A Inai
Test methods for wood preservatives against Lyctus: (1) Testing of treated veneer. (2) Testing of glue-line treated plywood. (Laboratory methods)
1977 - IRG/WP 293
Powder-post beetles destroy large quantities of veneer and plywood. Two test procedures are described which can be used to support application-oriented research into veneer and plywood preservatives. These procedures simulate practical conditions on a laboratory scale. Their characteristic feature is that wood species of special susceptibility are used for the tests; the susceptibility of the spec...
S Cymorek
The fate of salt preservatives in facility yard soils and decontamination of soils and drainage waters
1993 - IRG/WP 93-50001-25
Extensive studies during the past 10 to 15 years revealed that noticeable amounts of preservative components may be released in the environment by dripping off or by rain prior to fixation unless adequate precautions are taken. Therefore, soil and groundwater contamination especially from chromium-VI compounds but also from other inorganic and organic constituents exist in impregnation plants, pos...
R-D Peek, H Klipp, K Brandt
Difference of CCA efficacy among coniferous wood species
1990 - IRG/WP 3601
Wood blocks of Cryptomeria japonica, Tsuga heterophylla, and Pinus radiata successively extracted with n-hexane, ether, and methanol were treated with various concentrations of CCA type 3, which were subjected to the decay by Tyromyces palustris. The weight loss were different among species and kinds of extraction. Cryptomeria japonica treated with CCA had higher fungal resistance than Tsuga heter...
K Yamamoto, M Inoue
Wood surface pretreatments with metal tannates
1989 - IRG/WP 3552
The sequential application of aqueous solutions of tannins derived from radiata pine bark and water-soluble metal salts was examined as a means of improving the water repellency of wood surfaces. Nine metal salts were screened in combination with tannin solutions and, based on water repellency of pretreated filter paper, four were selected for further study. The two-step application of tannin solu...
D V Plackett, D R Cronshaw
Water-based silicones on wood
1997 - IRG/WP 97-30144
Five waterbased silicones commonly used on masonry where tested as water repellents for wood. The Water Repellent Effectiveness was determined by swellometer-tests and by measuring the water uptake of samples after 24 hours complete immersion and by immersion in a water level of 4 mm for 24 hours. The different methods are compared and discussed. Artificial and natural weathering was performed to ...
D Lukowsky, R D Peek, A O Rapp