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Improved PEC preservatives with added biocides
1985 - IRG/WP 3322
Biocidal chemicals have been incorporated into formulations within the broad framework of pigment emulsified creosote (PEC) to provide novel potential multi-purpose preservatives. Preparations of PEC plus TCMTB, Boracol 40, copper ethanolamine nonanoate, Quatramine 80, arsenic trioxide, Troysan Polyphase, and CCA have been formulated and assessed for preserving ability in soil-jar and Accelerated Field Simulator tests. In addition, a cationic oil-in-water emulsion preservative combination of PEC and CCA (PECCA), and an anionic formulation of TCMTB with PEC (PECBUS) have been manufactured in 400 L quantities to treat hardwood pole stubs and pine posts. The results indicate the potential of these improved second generation PEC-based preservatives to provide low-creosote containing treatments able to protect commodities against biodeterioration as well as provide dry, clean surfaces.
H Greaves, C-W Chin, J B Watkins


Diffusion of fused borate rods in top ends of poles
1989 - IRG/WP 3518
Diffusion tests of fused borate rods were carried out on extremities of sapwood poles in service. Rods were set in drills under the cone with or without addition of liquid Boracol 40. After one year of weathering, a good diffusion in the slice under the cone and even below the slice and in the cone itself was observed in Scots pine and spruce poles. The rods were still intacts and constitute, in fact, a reserve of boric acid for the future. This type of treatment would be satisfactory as secondary treatments of poles in service.
D Dirol, J P Guder


Remedial ground-line treatment of CCA poles in service. A final report after 60 months' testing
1989 - IRG/WP 3534
Remedial treatment of CCA treated utility poles of Pinus sylvestris with incipient decay was carried out in 1983 and the results of chemical and microbiological analyses 6 months after treatment were reported in Document No: IRG/WP/3388 while microbiological studies 12 and 28 months after treatment as well as chemical analyses of poles treated with boron rods or boric acid paste 28 months after treatment were reported in Document No: IRG/WP/3481. 60 months after the treatment a final study was carried out on the remaining two poles left from each treatment. The study included isolations of fungi as well as chemical analyses of poles treated with boron rods, boric acid paste and borate/glycol.
B Henningsson, H Friis-Hansen, A Käärik, M-L Edlund


The effect of glycol additives on diffusion of boron through Douglas-fir
2000 - IRG/WP 00-30235
Boron is highly effective against a variety of fungi and insects and is able to diffuse with moisture through wood. Diffusion decreases sharply at lower moisture contents, a characteristic that limits the potential use of this material as a remedial treatment for arresting internal decay. One approach to improvi ng boron diffusion is the simultaneous addition of glycol, which is presumed to enhance boron diffusion. In this study, the potential effects of glycol addition were explored by adding glycol plus boron (Boracol 20®, Boracol 40® or BoraCare®) or Timbor® and fused boron (Impel rods®) to produce a desired boric acid equivalent in each pole. Boron movement was assessed by periodically removing increment cores for chemical analysis. All of the supplements improved the diffusion of boron through Douglas-fir wood. Timbor®, which does not contain glycol, resulted in the most even distribution of boron throughout the poles while Boracol 40® seems to have increased boron diffusion to the point of loss from the poles.
C M Freitag, R Rhatigan, J J Morrell


Borate diffusion in wood from rods and liquid product. Application to laminated beams
1988 - IRG/WP 3482
In the aim to use borate preservatives (fused rods and boracol) in fields of building construction other than external joineries, tests of diffusion of borate rods and secondary boracol, were carried out on different species of woods exposed to different moisture conditions. Tests were also applied on laminated beams very often subjected to high moisture contents and thus decay of rot fungi. Diffusion was tested in different conditions and in relation, the action of these products was tried with stains and resins for improving strength properties. Diffusion tests on several species of wood confirm the proportionality already observed between moisture content and diffusion of borates in wood for all species. In a short time, test of diffusion on laminated wood showed a good diffusion in two lamella along the glue line leading to another way of boring. There is no problems between these borate products and stains or resins.
D Dirol


Remedial ground-line treatment of CCA poles in service. A progress report after 28 months' testing
1988 - IRG/WP 3481
Remedial treatments of CCA-treated poles in service with incipient soft rot were carried out with boron rods, boron/glycol solution, boric acid paste, copper/creosote paste and a commercial product (DFCK paste) respectively. The micro-flora before remedial treatment and 6 months after as well as the spread of chemicals in the poles were reported in Document No: IRG/WP/3388. In this progress report the changes in the micro-flora after 12 and 28 months are detailed together with the results of chemical studies on the spread of borates after 28 months. Studies have also been carried out on the sensitivity to borates of some fungi as well as the soft rot capacity in pine wood of some fungi isolated 28 months after treatment. The results concerning the micro-flora after 28 months are encouraging for boron rods, boron acid paste and especially for DFCK-paste. The spread of borates after 28 months was very good. In sapwood the average concentration, as boric acid, exceeded 2 kg/m³ in treated zones in poles treated with boron rods and 1.0 kg/m³ in treated zones in poles treated with boric acid paste.
B Henningsson, H Friis-Hansen, A Käärik, M-L Edlund


Boracol 40 - A potential remedial and preservative treatment for lyctids
1983 - IRG/WP 1192
The paper reports on a preliminary assessment of the efficacy of a diffusion formulation, Boracol 40, when applied as a brush treatment: to the surface of Eucalyptus obliqua against the powder-post borer Lyctus brunneus. After a five month bioassay, Boracol 40 has severely retarded the progress of active infestations of Lyctus brunneus and has been 100 per cent effective as a preventative treatment
J W Creffield, H Greaves, C D Howick


Wood preservation in France. "Bois plus" chain of quality. Description of the scheme early 1989
1989 - IRG/WP 3519
1989 - description of the French "CTB-BOIS PLUS" homologation scheme...
G Ozanne


Sequential exposure of borate treated Douglas-fir to multiple Formosan subterranean termite colonies in a 40-week field test
1993 - IRG/WP 93-10006
Douglas-fir boards (ca. 74.5 g) pressure-treated with disodium octaborate tetrahydrate (DOT) retentions of 0 (controls), 0.88, 1.23, 1.60, or 2.10% (weight/weight) DOT were sequentially exposed to four active field colonies of Formosan subterranean termites, Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae), in an above-ground field test. Samples were placed in contact with each colony for 10 weeks, with oven-dry weight losses determined between exposures, for a total termi exposure period of 40 weeks. Feeding activity differed among termite colonies, with the control wood samples having mean weight losses of 1.3-15.1% of their initial weight during each individual 10-week termite exposure. The two lower borate retentions (0.88 and 1.23% DOT) were virtually equal efficacy, with mean wood weight losses during each individual 10-week exposure ranging from 1.2-4.6%. Feeding was negligible at the two higher borate retentions, with mean wood weight losses from termite feeding during each 10-week period ranging from 0.7-1.3% with 1.60% DOT, and 0.3-0.9% with 2.10% DOT. Total cumulative wood weight losses over the 40 week exposure were: 10.2% (0.88% DOT), 8.7% (1.23% DOT), 3.6% (1.60% DOT), and 2.4% (2.10% DOT).
J K Grace, R T Yamamoto


Analysis of creosote posts after 40 years of exposure
1994 - IRG/WP 94-50035
In the early 1950s The Western European Institute for Wood Preservation (WEI) started a program for testing creosote and salt treated posts in three exposure sites in Europe. Of these only the site in Simlångsdalen in south western Sweden remains today. The purpose with this investigation was to demonstrate which creosote components are still retained in the posts after 40 years of exposure and which components have migrated or evaporated. Three posts, impregnated with three different creosotes, from the site in Simlångsdalen have been studied. The retention, composition and distribution of creosote in the posts have been determined and compared with data on the original creosote. After 40 years of exposure creosote loss is greatest in the post impregnated with creosote containing the highest fraction of low-boiling constituents. The loss is greatest in the top sections of all three posts. The concentrations of low-boiling compounds (b.p. < 270°C), e.g. naphthalene and 2-methylnaphthalene are very low. The residual creosotcs have the greatest percentage of high-boiling constituents (> 315°C), especially phenanthrene and anthracene (b.p. 340°C). The soil close to those posts which were "over-loaded" with creosote during the treatment process, contains increased concentrations primarily of the heavier components fluoranthene, pyrene and chrysene. The small number of posts analyzed limits the possibility to generalize the conclusions.
G Bergqvist, S Holmroos


Microbial biofouling of 10-40% naphthalene in creosote treated and untreated wooden pilings in the marine environment
1978 - IRG/WP 442
R R Colwell, P L Fish, D A Webb, A J Emery


Report of meetings of remedial treatments Sub-group held in Madrid, Spain during 27-28 April 1988
1988 - IRG/WP 3502
J N R Ruddick


Minutes of the Plenary Meeting 1970
1970 - IRG/WP P 40
IRG Secretariat


The performance of glue laminated railway ties after 40 years of service in the main line track
1989 - IRG/WP 2325
Two series of horizontally glue laminated ties made of a softwood body and topped with a hardwood lamination were creosoted and installed in 1947 in a tangent and a curved main line track. The tests are now 40 years old and the excellent condition of the ties of these two series suggest that a service life of 50-60 years can be expected.
J P Hösli, E E Doyle, C P Bird, T Lee


Comparison of decay rates of preservative-treated stakes in field and fungus cellar tests. Results after 40 months fungal cellar exposure
1983 - IRG/WP 2200
Decay rates of preservative-treated Pinus radiata stakes during 40 months exposure in the FRI fungus cellar were compared with those of similarly treated material in a field test. Decay rates in the fungus cellar were from 4 to 100 times higher than in the field, although for the majority of preservatives the rate was between 7 and 12 times higher. The lag phase before onset of decay, noticeable with most of the preservatives in the field test, was largely eliminated in the fungus cellar. Possible reasons are given for inconsistencies in relative rates of decay of preservatives in the two tests.
M E Hedley


Effects of boron treatments on partially decayed oak and pitch pine heartwood
1996 - IRG/WP 96-30106
This paper reports results of borate based preservative treatment and leaching experiments on partially decayed oak and pitch pine heartwood. Previous experiments have shown little damage is caused to sound timber of these types when treated with Polybor and Boracol 20 preservatives. This experiment was carried out to assess the suitability of selected borate based preservatives for use in historical ships&apos; timbers and therefore the physical effects of these preservatives on such timber was investigated. The results indicate that weight losses incurred due to treatment with Polybor or Boracol 20 are no more damaging than those incurred by treatment with water. Weight changes were more apparent in decayed timber than in sound timber with greater uptakes in non-leached samples and greater weight losses in leached samples. However, comparable weight changes were recorded between water treated samples and preservative treated samples. Dimensional changes were minimal in most cases, the greatest found in non-leached Boracol 20 samples as expected. These results indicate that treatment with these preservatives is suitable for partially decayed oak and pitch pine heartwood.
S McCutcheon, G M Smith, J W Palfreyman, P Durrant


Theoretical and practical experiments with eradication of the dry rot fungus by means of microwaves
1992 - IRG/WP 92-1577
Engineer Claus Andersen constructed a device in 1986 for microwave treatment of fungal infested timber. The device was tested on ampullae with live fungal mycelium of the dry rot fungus. A 10 minutes treatment at 37°C gave satisfactory eradicating effect. The method has since been used in practice in approximately 100 instances. A spot-test control has shown satisfactory results.
J Bech-Andersen, C Andersen


The 40th Annual Meeting of IRG. Programme
2009 - IRG/WP 09-60270
IRG Secretariat


The 40th Annual Meeting of IRG. Poster abstracts
2009 - IRG/WP 09-60280
IRG Secretariat


Invitation IRG 40
2009 - Invitation IRG 40
IRG Secretariat


Section reports from IRG 40
2009 - IRG/WP 09-60281
J Norton


Microbial fouling of 10-40% naphthalene in creosote treated and untreated wooden pilings in the marine environment - A progress report
1980 - IRG/WP 455
In June 1978, Document No: IRG/WP/442 entitled &apos;Microbial Biofouling of 10-40% Naphthalene in Creosote Treated and Untreated Wooden Pilings in the Marine Environment" was released to the IRG members as a report on the early results of a long term (about 5 years) study of whether the naphthalene content of creosote was importart in protecting wood pilings in the marine environment from borers, principally Limnoria tripunctata. In addition to this information, the project was designed to provide information relative to whether creosote treated wood pilings constituted a serious problem in the marine environment due to the leaching of the creosote. Data was, therefore, collected on the concentration of creosote and naphthalene in the water argund the pilings, in the sediment near the pilings and did filter feeder marine organisms such as clams, mussels, oysters, etc. concentrate creosote and naphthalene in their tissues in sufficient quantity to cause mutagenesis by the Ames mutagenic fest. Finally, a study of the microbial species and populations of these pilings at the intertidal and submerged surfaces was also followed versus timet Accordingly, a total of 464 pilings were treated as follows: 313 with 40% naphthalene in creosote, 49 with 30% naphthalene in creosote, 51 with 20% naphthalene in creosote and 51 with 10% naphthalene in creosote. These pilings were southern pine pilings procured in accordance with ASTM D25 kiln dried and treated by Koppers Company, Inc. in accordance with the American Wood Preserver&apos;s Association Standard C3 for creosote treatment of marine piles. The pilings were systematically positioned argund Pier No. 3 at Roosevelt Roads, Puerto Rico from November 1977 to January 1978. Baseline data on the normal bacterial and fungal species and bacterial counts in and chemical analyses of the sediment, water column and on the pilings was taken at Pier No. 3 and at some distance from the pier where no pier existed. IRG/WP/428 provided the microbial studies on these baseline samples. Periodically (approximately two times per year) repeat samples were taken in these same areas to determine the change of flora and chemical analyses versus time. This is a progress report of the data obtained approximately two years after placement of the pilings.
R R Colwell, A J Emery


Efficacy of Didecyl Dimethyl Ammonium Chloride (DDAC), Disodium Octaborate Tetrahydrate (DOT), and Chlorothalonil (CTL) against Common Mold Fungi
2004 - IRG/WP 04-30338
The fungitoxic properties of four fungicides, alone and in combination, against four different mold fungi commonly associated with indoor air quality problems were evaluated on two different wood species and sheetrock. The fungicides were chlorothalonil (2,4,5,6-tetrachloroisophthalonitrile) (CTL) in a 40.4% aqueous dispersion, disodium octaborate tetrahydrate (DOT) in two different forms - a 40% glycol solution and a 98% wettable powder, and didecyl dimethyl ammonium chloride (DDAC) in an 80% solution. The fungi were Aspergillus niger, Cladosporium cladosporioides, Penicillium brevicompactum, and Stachybotrys chartarum. All fungicide treatments on wood reduced growth, sporulation and discoloration of the mold fungi when compared to nontreated specimens. No single fungicide provided total control of all four fungi on wood. CTL provided the best single-agent protection by totally preventing the growth of C. cladosporioides and S. chartarum and reducing growth of A. niger and P. brevicompactum to low levels. DOT in both forms was very effective against A. niger, but provided only sporadic protection against other fungi. DDAC provided good protection against S. chartarum but was not as effective against the other molds. Combinations of the different biocides were more effective than any single agent. DOT + DDAC totally prevented or greatly reduced growth of A. niger, P. brevicompactum and S. chartarum. Cladosporium cladosporioides was the most difficult organism to control, but even this was achieved when DDAC was increased to 1.0% with DOT. The most consistent control of discoloration, sporulation, and growth of the fungi on wood was obtained with the combination of DOT and CTL. DOT, alone or in combination with DDAC or CTL, was also very effective against the fungi on sheetrock. The results suggest that by using appropriate products, during construction or after water damage, problems associated with the growth of common molds and their potential health effects can be avoided.
J A Micales-Glaeser, J D Lloyd, T L Woods


Efficacy of fumigants in the eradication of decay fungi implanted in southern pine timbers
1986 - IRG/WP 3365
Southern pine timbers (15.2 cm x 15.2 cm x 4.26 m) were fumigated at midlength to evaluate the effectiveness of the fumigants chloropicrin, Vapam, Diazomet, Busan 40, Vanicide 51, Vanicide TH, sodium bisulfite, and ethanolamine in eradication of decay fungi. The fumigants were introduced into 2.54 cm holes which were closed immediately with rubber stoppers. Movement and persistence of lethal concentrations of the vapors were monitored using eight important wood-decay fungi as the vapor-sensing agents. Residual fumigant in the timbers was determined by a bioassay with Gloeophyllum trabeum. Chloropicrin was the most effective of the eight fumigants. Diazomet was the second most effective followed closely by Vapam. The remaining fumigants were ineffective in eradication of the fungal cultures. Fumigant toxicity was generally greatest during the first 4 months following treatment. None of the fumigants were particularly effective at 0.61 m and 1.22 m from the base of fumigation. Bioassay of wood removed from the timbers 1 year after treatment showed no residual toxicity to Gloeophyllum trabeum. Fumigant efficacy varied between timbers. Movement and longevity of the fumigants in the southern pine timbers was not as great as that observed previously in Douglas fir timbers.
T L Highley, W E Eslyn


Practical experiments with Boracol 10 Rh used as a fungicide in the repair process after attack by the dry rot fungus (Serpula lacrymans)
1987 - IRG/WP 3458
The test is carried out in an old house in Nyhavn, Copenhagen. The roof and the walls close to were heavily attacked by dry rot fungus (Serpula lacrymans) because damage to the zinc covering the frontspice were letting in water to the wood and wall construction. An attack by the dry rot fungus is more complicated to repair compared with other wood destroying fungi because beside the damage on wood, mortar in the walls is penetrated by the hyphae of the fungus. The reason for this is the need for basic building materials the dry rot fungus has to neutralize the great production of oxalic acid.
J Bech-Andersen


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