Your search resulted in 967 documents. Displaying 25 entries per page.
Tropical In-Ground Durability of Structural Sarawak Hardwoods Impregnated to High Retention with CCA-salts, CCA-oxide and FCAP after 20 Years Exposure
2005 - IRG/WP 05-30384
Statistical analysis (ANOVA) was conducted on durability (termite and decay combined) rating data collected over 20 years exposure period of over 140 species of Sarawak timbers with altogether 30,000 stake specimens, at the Forest Department’s Sibu “graveyard” stake test sites from 1977. About 20 replicated stakes were pressure-treated to refusal with 10% g/ml concentration of up to 3 CCA-sa...
Wang Choon Ling, A H H Wong
The influence of extractives on the natural durability of selected Ghanaian hardwoods
2004 - IRG/WP 04-10530
A study of the durability of Nauclea diderrichii, Nesogordonia papaverifera, Corynanthe pachyceras and Glyphaea brevis in laboratory and field tests showed the first three species performed well against a range of fungi and termites. Sapwood of C. pachyceras also performed well against these biodeteriogens. The role of extractives in conferring natural durability was assessed. Total extractive con...
C Antwi-Boasiako, A J Pitman, J Barnett
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
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
Cleistanthus collinus (Roxb.) Benth. ex Hook. f. and Wrightia tinctoria (Roxb.) R. Br. -- two timbers with promising durability under marine conditions
2005 - IRG/WP 05-10552
During the course of natural durability studies on indigenous timber at Visakhapatnam harbour, two species, namely, Cleistanthus collinus (Karada) and Wrightia tinctoria (Dudhi) were found to resist marine borer attack for reasonably longer periods. The panels of C. collinus completely resisted borer attack for 9 months but became susceptible to teredinid attack thereafter. The teredinids gradua...
M V Rao, M Balaji, V Kuppusamy, K S Rao
Towards a unified international hazard class system
1996 - IRG/WP 96-20081
Working party 2.5 on International Standardisation has set the development of a unified hazard class system as a short-term objective. This document is intended to stimulate the discussion required to work towards such a system. Two possible approaches are discussed, the compromise approach and the development of a basic system from first principles. For the second approach, the factors impacting ...
P I Morris
Ten year performance of l-joints made from borate diffusion treated wood
2000 - IRG/WP 00-30225
While there are decades of experience with borate-treated wood in coated, exterior applications in New Zealand and the UK, other countries have been more reluctant to use this process. As part of a research program on the potential use of borates by the Canadian wood products industry, Forintek set up, in 1990, an L-joint test of untreated and borate-diffusion treated hem-fir (western hemlock and ...
P I Morris
Evaluation of tropolone as a wood preservative : activity and mode of action
2002 - IRG/WP 02-30282
The fungicidal activity of 2-hydroxy cyclohepta-2,4,6-trienone (tropolone) analogue of b-thujaplicin a natural product responsible for the durability of heart wood of several
cupressaceous trees was investigated in vitro on growth of white and brown rot fungi. Results obtained show that tropolone, easily prepared from commercially available products,
possesses strong fungicidal activity similar ...
P Gérardin, M Baya, N Delbarre, P N Diouf, D Perrin, P Soulounganga, E Gelhaye,
J P Jacquot, C Rapin
Issues Facing Wood Preservation in Australia Today
2003 - IRG/WP 03-30327
Timber and timber products are a major part of the Australian building industry and preservative treatment is a common consideration for most timber users. Despite this however, there is a major lack of awareness by the users of the various issues associated with preservative treatment.
Australian treatment specifications are logical, concise and uncomplicated. There are three agencies in Austr...
J Norton
Termite durability of sugi (Cryptomeria japonica) heartwood kiln-dried under high-temperature process in relation to wood extractives
2005 - IRG/WP 05-10547
Termite durability of sugi heartwood samples kiln-dried under a high-temperature process were evaluated by using Reticulitermes speratus (Kolbe) as a test termite sp. The n-hexane extractives of these samples were analysed by a GC technique. The less termite durability was shown on the wood samples dried under the high-temperature process, in comparison with that of the air-dried samples. No GC-p...
S Shibutani, E Obataya, K Hanata, S Doi
Insect growth regulators: modes of action and mode of action-dependent peculiarities in the evaluation of the efficacy for their use in wood preservation
1997 - IRG/WP 97-30155
Up to now, the insecticides used in wood preservation are either of more or less non-specific mode of action - like boron - or of neurotoxic mode of action - like chlorinated hydrocarbons, carbamates and pyrethroids. The active ingredients actually used are primarily mirroring the progress in active ingredient research in plant protection. The methods of testing of the insecticidal efficacy of woo...
M Pallaske
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
Screening test methods with termites as first laboratory evaluation of new active substances for wood preservation
1995 - IRG/WP 95-10135
European test methods (EN) with termites have been compared with long-standing experience from screening test methods in the laboratory of Eberswalde. The results are discussed in terms on the possibility of using screening test methods as the first laboratory evaluation of new active substances in wood preservatives. The advantages and disadvantages of these methods are considered. Only a small a...
W Unger
Harmonisation of technical requirements of treated wood in Europe. What can we learn from the experience in the Nordic countries?
1995 - IRG/WP 95-50040-20
In the Nordic countries the Nordic Wood Preservation Council (NWPC) has since 1972 harmonised the technical requirements for pressure treated timber in a Nordic standard. These requirements were used by the control schemes that exist in every country. In 1976 the first Nordic standard for pressure treated wood was accepted and in 1978 NWPC changed from recommendations to approvals for the preserva...
F G Evans
The limitations of legislative information distribution to the UK remedial preservation industry
1995 - IRG/WP 95-50060
The remedial preservation industry in the UK consists of companies that are rarely large enough to fit any of the definitions of small to medium enterprises (SMEs). They are faced with information on a wide range of legislation related to their industry from a bewildering variety of sources. Costs range from free to hundreds of pounds. Recent surveys have shown that a significant proportion of SME...
J M Ibbitson, G S Sawyer
Treatment groups and remedies for CCA treated hardwood and softwood poles
1999 - IRG/WP 99-40142
Different hardwood and softwood species from Bangladesh and Bhutan was investigated regarding density, green fiber stress, natural durability of heartwood and CCA treated sapwood, CCA treatability grades, sapwood thickness, and kiln-drying properties for long term use as electric poles. These properties along with the past service records for nineteen years, separated ten heardwood and five softwo...
A K Lahiry
Information from the COIPM wood group. (With Appendix: Préserver les matériaux en milieu marin sauvegarder l'environment marin telles sont la vocation et la mission du C.O.I.P.M.)
1989 - IRG/WP 4156
During the last COIPM Meeting, up to date information on cooperative work to test the resistance of plastic wrapping for pilings were submitted and discussed. In 1986 untreated wood samples wrapped with shrinkable polyolefin sleeves were submerged in 9 stations, situated in temperate and tropical waters. After 1 or 2 years of immersion the samples showed no sign of penetration by marine borers and...
A Gambetta
Screening of fungal strains for wood extractive degradation
1998 - IRG/WP 98-10254
Fungal strains were screened for their ability to degrade apolar extractives in wood from scots pine. The degradation of total wood extractives by 91 different strains was monitored in stationary batch assays incubated for 6 weeks. The results obtained show that the ability of wood-inhabiting fungi to utilize wood extractives varied greatly, even for different isolates of the same species. Fungal ...
J Dorado, M J Martinez-Inigo, T A van Beek, F W Claassen, J B P A Wijnberg, R Sierra-Alvarez
Characteristics of thermally modified wood in vacuum
2004 - IRG/WP 04-40287
In commercial thermal wood modification processes nitrogen, steam or oil has been used for the reduction of oxygen content in the reactor atmosphere. In present study no special heating medium, but an initial vacuuming step has been used for this purpose. Mass loss, resistance to fungal decay, dimensional stability, bending strength and modulus of elasticity of heat treated wood were evaluated and...
G Rep, F Pohleven, B Bucar
Preservation of coppice wood for the fabrication of glued beams or panels
1987 - IRG/WP 3427
In this survey we will examine the specific problems concerning the conservation and the preservation of timber (issued from trunks of small diameter corresponding to products of clearings or coppices) destined for the fabrication of solid reconstituted elements. Thus for six metropolitan species of wood, we first characterized the biological deteriorations which occur after felling and their kine...
G R Y Déon, R Schwartz
Conservation of Nypa fruticans and Indigenous Timber Species of Sundarban Mangrove Forest of Bangladesh by Using Preservative Treatment.
2005 - IRG/WP 05-40297
This report describes the possibilities and benefits of preservative treatment of some Bangladeshi wood species. It is concluded that:
Heartwood of Sundri is not easily treatable. The treating schedule of 14.1 kg/cm² pressure and eight hours treatment period may be used for treating sundry logs. During the treatment of Sundri wood must not mix with other species. Other timber species such as Gew...
G N M Ilias
The status of the Working group on Preservation of Wood in the Marine Environment
1977 - IRG/WP 424
At the last joint meeting of IRG/COIPM members in May 1976 at Wildhaus, Switzerland, a proposal was made that the existing 'Marine Group' should become a formal part of IRG. At present, members of the Wood Group of the COIPM (Comite International Permanent pour la Recherche sur la Preservation des Materiaux en Milieu Marin), and members of IRG who are interested in wood preservat...
R A Eaton
Preliminary investigation on the natural durability of Guayule (Parthenium argentatum)-based wood products
2000 - IRG/WP 00-40154
Conventional preservatives used to protect wood from insect and microbial damages are presently of major concern to human health and the environment. Finding alternative and economical preservatives has not been successful. Previous studies have shown that the resinous material extracted from the guayule plant (Parthenium argentatum, Gray) has both insect- and microbial-resistant properties. Unfor...
F S Nakayama, P Chow, D S Bajwa, J A Youngquist, J H Muehl, A M Krzysik
Wood preservation in Slovenia
2004 - IRG/WP 04-30361
Biotechnical faculty, Department of Wood Science and Technology is the centre for education and for research activities in the field of wood preservation. The most important researches are performed on: decay patterns of wood decay fungi, copper tolerant fungi, copper based preservatives, wood modification, conservation of wooden artefacts and improvement of performance of coated wood used in exte...
M Humar, F Pohleven
Durability of Sugi (Cryptomeria japonica D.DoN ) wood treated in high temperature liquid paraffin
2002 - IRG/WP 02-40221
Sugi(Cryptomeria japonica D.DoN )wood was subject to a heat treatment in high-temperature liquid paraffin for the purpose of improving the resistance against fungi and termites without chemicals. The bath of paraffin liquid, which can provide a uniform heat transfer (±2?), was used at temperatures of 90?,120?and 150?.?ecay resistance according to JIS K 15711) was evaluated using a brown rot fungu...
Y Matsuoka, W Ohmura, S Fujiwara, Y Kanagawa