Your search resulted in 171 documents. Displaying 25 entries per page.
Effect of origin and orientation of Radiata pine substrates on the development of fungal degrade
2000 - IRG/WP 00-30221
The objective of this study was to determine the influence of different radiata pine substrates on colonisation by sapstain fungi. Freshly-cut branch wood, stem wood and sawn lumber were used to prepare test samples with the largest wood surface area showing a transverse, radial or tangential face. Test samples were evaluated against sapstain fungi using a rapid laboratory antisapstain screening m...
B Kreber, D R Eden, C M Chittenden, B Carpenter, J G Van der Waals
Sentry®), a new antisapstain formulation for protecting logs and lumber. - Part 1: advances in protection of New Zealand radiata pine logs
1999 - IRG/WP 99-30188
Until recently antisapstain formulations gave approximately 10 weeks protection to radiata pine logs and even within this time frame protection was often not consistent. Industry requires 20 weeks protection. The degree of protection sought by industry is in the order of 90-95%. For example, this equates to a maximum of 5 - 10% surface cover of sapstain in the first whole veneer produced from a pe...
R N Wakeling, D R Eden, C M Chittenden, J G Van der Waals, B Carpenter, I Dorset, R Kuluz, J Wakeman, T Price, B Nairn
The lasting dehydration of wood treated by bifluorides worked up in Diffusec noticed by a continual drying of the wood
1999 - IRG/WP 99-30196
After an immersion of sound wood in a solution of Diffusec, in which a combination of acid potassium and ammonium bifluorides = FHF- in dissociated form is present, their potassium and ammonium fluoride ions together with the bifluoride ion = (FHF-) diffuse into the wood. They make use of the woodmoisture available as O-H-O bonds directly attached to the cellulose in the wood fibres to attract the...
H F M Nijman
Environmental risk assessment of wood preservatives in the Netherlands
2001 - IRG/WP 01-50166-10
Before biocides can be introduced to the Dutch market, they have to be authorised under the Pesticides Act (1962). The criteria for authorisation of biocides have been laid down in the Dutch Decree on Environmental Requirements for the Authorisation of Pesticides Used in Fields Other than Agriculture. In 1998, the EU Biocides Directive (98/9/EC) entered into force, and it was implemented in May 20...
E Smit, P van der Zandt, J Appelman
Genetic Engineering in tree breeding
1998 - IRG/WP 98-10294
The genetic improvement of forest trees by classical breeding is a slow process in comparison with that of annual crops. Tree breeding however is of great importance and has led to trees with better growth characteristics and better disease resistance. An important wood characteristic which has been neglected in breeding programs is wood durability. The durability of the wood will determine for wh...
J Van Doorsselaere, H Beeckman, M Van Montagu, W Boerjan
Modelling of copper emission fron treated wood leached according to NEN 7345 and ENV 1250.2
1996 - IRG/WP 96-20097
A series of water leaching experiments is carried out investigating pine and spruce treated and fixed using different copper-containing preservative solutions and process technologies. Water changes took place as prescribed in the Dutch standard NEN 7345 and the European test method ENV 1250.2, each of the leachates being chemically analysed for their copper content. Irrespective of the preservati...
G M F Van Eetvelde, S G L Michon, M Stevens
Decay potential of various New Zealand Phlebiopsis gigantea strains using a soil block method
1999 - IRG/WP 99-10309
The objective of the current study was to determine the decay potential of different strains of Phlebiopsis gigantea using Pinus radiata and European Fagus sylvatica, respectively. A soil block method was used to determine mass weight loss of P. radiata and F. sylvatica following 10 weeks incubation with different strains of P. gigantea. For comparison, Trametes versicolor, Postia placenta, Gloeop...
B Kreber, J G Van der Waals
Proposal for a method aiming at the quantification of the impact of wood extraction in Life Cycle Assessment
1998 - IRG/WP 98-50113
Life Cycle Assessment has been accepted as an instrument for the assessment of the environmental impact of products. Characterisation factors for impact assessment of emissions from products have been established. To date no characterisation factor exists for the extraction of biotic resources, for example wood. Since the main disadvantage of using wood as a material lies in the extraction of reso...
P Esser, E Van der Voet
Fungus cellar and antisapstain field trial studies of six triazole fungicides
1995 - IRG/WP 95-30077
The efficacy of six triazole fungicides was compared using a fungus cellar soil bed test, a rapid antisapstain laboratory trial and a 36 week antisapstain field trial. After 21 months in the fungus cellar the mean soundness of radiata pine treated with 1.5 kg/m³ of cyproconazole, azaconazole, hexaconazole, tebuconazole, propiconazole and flusilazole in combination with 1.0 kg/m³ didecydimethyl a...
R N Wakeling, J G Van der Waals, R D Narayan, J B Foster, B E Patterson, P N Maynard
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
Effect of leaching temperature and water acidity on the loss of metal elements from CCA treated timber in aquatic applications. Part 1: Laboratory scale investigation
1995 - IRG/WP 95-50046
In order to investigate the applicability of current prestandard leaching test methods, a series of experiments has been performed on CCA impregnated wood dealing with the influence of pH, temperature and agitation of the surrounding water. The leaching method used in this first part of the investigation is the European prestandard drafted by CEN/TC38/WG11, a short term dynamic leaching test under...
G M F Van Eetvelde, R J Orsler, G E Holland, M Stevens
Degradation of resin constituents in various wood species by the white rot fungus Bjerkandera sp. strain BOS55
1999 - IRG/WP 99-10301
In previous studies, the white-rot fungus Bjerkandera sp. strain BOS55 was shown to cause extensive degradation of lipophilic extractives (resin) in Scots pine wood. Further research was carried out in order to investigate the ability of Bjerkandera sp. for reducing resinous constituents in various softwood (Douglas fir, larch and spruce) and hardwood species (birch, beech and poplar). The greates...
J Dorado, T A Van Beek, F W Claassen, R Sierra-Alvarez
Aquatic toxicity research of structural materials
1998 - IRG/WP 98-50114
Continuing from preliminary results reported on the aquatic toxicity of some tropical hardwoods under high hazard conditions, a more comprehensive research study is set-up in order to assess the environmental toxicology of various structural materials in water applications. Hazard class 4 preservative treated wood is tested for its toxic response on a battery of aquatic test organisms, next to con...
G M F Van Eetvelde, S De Geyter, P Marchal, M Stevens
Biocidal Products Directive 98/8/EC and PT 08
2005 - IRG/WP 05-50224-1
The ECB Biocides Work Area is responsible for the scientific and technical
issues concerning the approval of active substances in biocidal products as
laid down in Directive 98/8/EC concerning the placing of biocidal products
on the market. The first part of the presentation will deal with the Review
Programme, especially it's legal context, the status of submitted dossiers
and the p...
K van der Jagt
Potential use of an emulsified tar oil fraction as a wood preservative: Preliminary technological and environmental assessment
1994 - IRG/WP 94-50028
In order to meet the recent environmental concern specifications of creosote are altered, the B[a]P content is limited and restrictions on the emission of volatile organic compounds (VOC) and higher polyaromatic hydrocarbons (PAH) are expected in some countries. Research has been conducted on an emulsion of a selected tar oil fraction. Using a waterborne formulation opens new perspectives for targ...
G M F Van Eetvelde, R Leegwater, M Stevens
Bethoguard; A new wood protecting fungicide for use in metal free ground contact wood preservatives
2002 - IRG/WP 02-30301
Research has identified the limitations in both the spectrum of activity and permanence of organic biocides placed in wood in high hazard environments, particularly in the absence of heavy metals such as copper. More specifically, the control of soft rot decay in wood in soil contact has proven to be most problematic.
The new organic biocide, Bethoguard; an oxathiazine, has demonstrated excellen...
S C Forster, G R Williams, M Van Der Flaas, M Bacon, J Gors
A comparison of rates of decay and loss in stiffness of radiata pine and Douglas fir framing lumber
2008 - IRG/WP 08-20378
Stiffness loss with time was recorded for untreated radiata pine and Douglas fir framing size lumber and preservative treated radiata pine which dad been pre-inoculated with Oligoporus placenta, a brown rot decay fungus isolated from decaying untreated radiata pine framing. Between stiffness measurements, samples were contained in a plastic tank located outside at ambient temperature. Index of Con...
M Hedley, D Page, J van der Waals
Wood plastic composites from modified wood. Part 3. Durability of WPCs with bioderived matrix
2008 - IRG/WP 08-40423
The decay resistance of fully bio-derived wood plastic composites, WPCs, was tested in both laboratory and field tests. The laboratory tests were performed according to modified versions of AWPA E10 (soil-block test) and ENV 807 (tests in three un-sterile soils) and the field tests according to EN 252 (stakes in ground) and EN 275 (resistance to marine borers). The WPC materials for laboratory tes...
M Westin, P Larsson Brelid, B K Segerholm, M Van den Oever
Assessment of Boracol 200RH (FrameSaver) as a remedial treatment to control decay in pre-decayed model timber frame units
2010 - IRG/WP 10-30529
Model timber frame units constructed from untreated radiata pine were pre-wetted to approximately 40% moisture content and inoculated with Coniophora puteana and Oligoporus placenta. Units were transferred to a controlled environment room maintained at 25°C and 95% RH for 7 and 10 weeks to allow two levels of decay to become established in units. Following pre-decay, units were disassembled, clea...
Mick Hedley, Dave Page, Jackie van der Waals
The durability of acetylated radiata pine sapwood (Accoya). Results from five years testing
2011 - IRG/WP 11-30560
New Zealand grown radiata pine sapwood was modified using the Accsys PLC acetylation process (Accoya). Following treatment, various test samples were exposed in the Scion Accelerated Field Test facility (Fungus Cellar) and in exterior ground contact field tests. In the Fungus Cellar, performance was compared with that of radiata pine treated with CCA to Hazard Classes H3.2 (0.37% m/m Cu+Cr+As) and...
M Hedley, D Page, J van der Waals, K Nasheri, G Durbin
Protective nanoparticle coating reducing water absorption of wood species
2012 - IRG/WP 12-40614
Nanoparticle coatings were deposited onto different tropical wood samples for controlling the surface hydrophobicity. The styrene(maleimide) nanoparticles were synthesized in aqueous dispersions under pure conditions or in combination with 70 wt.-% palm oil. A first evaluation of the non-coated wood surfaces indicates a high dependence between the water contact angles, the average surface roughnes...
P Samyn, A Paredes, G Becker, H Van den Abbeele, L Vonck, D Stanssens
Detection of Aureobasidium as the dominant fungus on coated wood
2013 - IRG/WP 13-10796
Wood is often covered with a coating in order to protect the surface. Unwanted dark mold growth on paint covered surfaces in external conditions is a familiar phenomenon. Simple microbial techniques have commonly been used to determine the dominant fungal species present in the discoloured area, for example morphological analysis of microscopic preparations of fungal pieces sticking to an adhesive...
E J Van Nieuwenhuijzen, M F Sailer, R A Samson, O C G Adan
The chemistry of wood degradation by Basidiomycetes studied in a van Krevelen diagram
2013 - IRG/WP 13-10805
The atomic composition ratios of decayed wood by Basidiomycetes are mapped in a van Krevelen diagram. It is shown that the wood residue after decay is chemically reduced, rather than oxidized. A previously developed and verified theoretical model for thermal wood modification, relating atomic composition ratios to moisture sorption and fungal resistance properties has tentatively been applied to w...
W Willems, H Militz
Statistical analysis of durability tests - Part 1: Principles of distribution fitting and application on laboratory tests
2013 - IRG/WP 13-20504
Service life prediction is an important topic in wood research, especially with regard to the Construction Products Regulation (CPR). Both laboratory tests as well as in-service performance testing are therefore essential in combination with proper monitoring and analysis tools. A crucial concept is variability in testing and analysis, especially for a biological material such as wood. The larger ...
I De Windt, J Van den Bulcke, C Brischke, C R Welzbacher, A Gellerich, S Bollmus, M Humar,
The development of accelerated test systems to evaluate the durability of framing timber
2014 - IRG /WP 14-20547
Various accelerated decay resistance trials including small simulated wall units, samples exposed in enclosed tanks and ‘I’ samples in stacks have been explored and used to test the durability of treated and untreated radiata pine framing at Scion since 2001. These testing methods have been established to determine the effectiveness of commercial formulations in preventing decay in framing sub...
T Singh, D Page, J van der Waals