International Research Group (IRG) on Wood Protection
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ItemAgenda Plenary Meeting 1970(1970)
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ItemPrevention of creosote bleeding from treated Scots pine poles(1970)Creosote, the most widely used preservative for pressure treatment of Electricity Board and GPO transmission poles in the United Kingdom has, when correctly applied, given good performance over a long period of time. Perhaps its only disadvantage as a preservative in the above fields is its tendency to exude or 'bleed' from a proportion of treated poles upon exposure to solar heat. This causes the poles to become oily making them difficult to handle during erection and maintenance and occasionally it causes annoyance to the general public who can soil clothes by brushing against such poles.
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ItemThe effect of water storage on the cell-structure of Sitka spruce (Picea sitchensis) with reference to its permeability and preservation(1970)Commercial treatment trials with full sized transmission poles have shown that water storage considerably improves the permeability of Sitka and Norway spruce. These results were confirmed by laboratory measurements which showed that in the sapwood of ponded Sitka spruce there is a vast improvement in permeability in all three grain directions. Heartwood permeability does not seem to be affected to any great degree. Detailed examination of the ponded sapwood by optical and electron microscopy showed that the tori and bordered pit membranes have been destroyed. This would explain its increased longitudinal and tangential permeability. Destruction of the bordered pit membranes would also affect radial permeability but it is thought that the main factor contributing to increased radial penetration was the partial breakdown of the crossfield pit membranes of the ray parenchyma cells. The microscopic examination showed no evidence of cell wall degradation. Preliminary tests have not revealed any deterioration of the strength properties of the wood due to prolonged ponding. There is evidence to indicate that the destruction of the pit membranes was caused by bacterial attack. Microbiological investigations are now in progress and it is hoped that this work will establish the identity and the mechanism of attack of these organisms.
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ItemAgenda WG III(1970)
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ItemCreosote for wood preservation. (Reissued from earlier OECD draft)(1970)The literature on this subject is extensive and, to some extent, repetitive so that for pratical reference purposes it is essential that selective surveys and bibliographies be prepared. Many of these exist and, as an example, the reports issued by The Coal Tar Research Association (Numbers 0156, 0292 and 0396) may be quoted. The following bibliography, listing the more important sources of information on coal tar creosote and its use as a wood preservative, is based on the C.T.R.A. reports and also on a list provided by the Bundesanstalt für Materialprüfung in Berlin-Dahlem. The bibliography is preceded by introductory remarks on the various aspects highlighting important points and suggesting topics for further research work.
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ItemAddendum to paper for discussion in Working II(1970)In view of the limited time that will be available for discussions in Nancy, this addendum has been prepared. Arising from the previous collaborative work and Mr Bravery’s visit to most of the co-operating Institutes, a scheme of work entailing tests carried out 1) by a technique chosen by individual Institutes; 2) by an agreed standardised technique would appear to be the best approach. A complete programme of work would embrace a) agar tests; b) soil tests -in sterile soil -in unsterile soil. Clearly allocation of priorities eg to concentrate in the first place on tests in unsterile soil, will be needed. To facilitate discussion on a standardised technique, possible methods for conduct of both agar and soil tests are included in appendix I and II respectively. Full details of practical procedures and methods of computing results have not been included.
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ItemCollaborative soft rot tests: Paper for discussion in Working Group II(1970)An account of the major part of the collaborative work on laboratory tests of toxicity of preservatives to soft rot fungi initiated by the European Homologation Committee at Delft in 1966 has been published in ‘Material und Organismen’ (1970) as a report of progress. The main objective of these collaborative tests, namely to establish a reliable and acceptable standard test method was not accomplished. The purpose of this paper is to comment upon the experience gained in order to facilitate discussions, at an IRG meeting, of any further proposals for achieving this objective.
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ItemAgenda WG II(1970)
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