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Blue stain in timber in service. Results of co-operative tests to compare different artificial weathering systems 1981-82
1983 - IRG/WP 2193
The paper describes results of the third phase of co-operative laboratory experiments comparing the effects of different artificial weathering systems on chemicals to control blue-stain in service. Atlas, Xenotest and Marr equipments are shown to give essentially the same results for 5 of the 6 chemicals tested.
A F Bravery, D J Dickinson


Resolution from IRG Working Group II Sub-group 4 'Stain in timber in service'
1984 - IRG/WP 2230
Sub-group 4 of IRG Working Group II has completed a series of studies of artificial weathering as an alternative to natural weathering in relation to testing the efficacy of chemicals in preventing blue stain in service. The Sub-group reports that within the limits of the equipments studied and described in its report Document No: IRG/WP/2215 the extent of blue stain varied little as a direct consequence of varying the artificial weathering system. The Sub-group considers that any or all of the methods based on the Atlas, Marr or Xenotest systems (as described in Table 4 of Document No: IRG/WP/2215) are suitable on technical grounds for inclusion in a specified methodology.
D J Dickinson


Blue stain in timber in service. Results of further IRG collaborative tests to compare different artificial weathering systems
1981 - IRG/WP 2146
The previous work described in Document No IRG/WP/286 examined 3 preservatives (1% phenyl mercury succinate - PMS, 5% pentachlorophenol - PCP and 1.5% Preventol A4 - PA4) subjected to 5 different artificial weathering systems (BAM Xenotest, Cuprinol Marr, EMPA Xenotest, Gori Atlas and PRL Marr) and after natural weathering at 5 sites (BAM, Cuprinol, EMPA, Gori and PRL). Results showed good correlation between natural weathering and 500 hours in the Marr and Atlas equipments. Natural weathering gave somewhat variable results for PCP and PMS; BAM and EMPA were the most severe and the Cuprinol site least severe. Members of the ad-hoc Group decided during discussions at the IRG meetines in Peebles in 1978, that further work was desirable so that an extended range of fungicides and of weathering equipment could be examined. The 11 participants who agreed to co-operate in various phases of the new work were: BAM (Berlin), Cuprinol (UK), EMPA (Switzerland), Gori (Denmark), Hicksons (UK), Imperial College (UK), Penarth (UK), PRL (UK), Protim (UK), Sadolins (Denmark) and Technological Institute (Denmark).
A F Bravery, D J Dickinson


Artificial weathering as an aid to assessing the effectiveness of chemicals for preventing blue stain in service - a co-operative study
1984 - IRG/WP 2215
The paper reports co-operative studies carried out within Working Group II of the International Research Group on Wood Preservation to assess the effects of different artificial weathering systems on the performance of fungicides to control blue-stain in service. It has been shown that Atlas, Xenotest and Marr equipments operated according to particular standard schedules can give essentially the same results for 5 of 6 fungicides tested.
A F Bravery, D J Dickinson


Blue stain in timber in service. Preliminary results of the IRG collaborative tests to compare natural and artificial weathering
1978 - IRG/WP 286
The collaborative programme was initiated at IRG Meetings in Wildhaus, 1976. The six collaborators were BAM (Berlin), Cuprinol Ltd (UK), EMPA (Switzerland), GORI (Denmark), PRL (UK) and Imperial College (UK). Experimental plans were finalised in December 1976 and panels treated by Cuprinol Ltd early in 1977. Natural weathering was carried out by BAM, Cuprinol, EMPA, GORI and PRL during April-September 1977. The biological test was carried out by the authors at PRL during May and June 1978 and final assessments were made in September 1978. Artificial weathering systems used were the BAM Weathering System, a modified Marr system (Cuprinol), the Xenotest (EMPA), the Atlas equipment (GORI), the Marr equipment (PRL). In the main, natural weathering during 1977 was equivalent to the artificial weathering systems run for 500 hours and slightly more severe than the same systems run for 250 hours. It is suggested that the most technically appropriate artificial weathering systems are the Atlas (500 hrs) and the Marr (250 hours).
A F Bravery, D J Dickinson


Blue stain in timber in service. Progress review of Sub-group collaborative tests - 1981/82
1982 - IRG/WP 2178
Following from the discussions after reporting Document IRG/WP/2146 at the Meeting in Sarajevo, 1981, it was decided that 1.) more precise definition was needed of the artificial weathering schedules used in the work - participants to re-check Table 8 and send further details or amendments to Dr Bravery; 2.) a further test employing a wider range of chemicals was necessary using a smaller range of artificial weathering schedules; 3.) a new test should be conducted to the panels during the biological tests. The 1982 programme is based on co-operation offered in Sarajevo for two institutes each to use Atlas (Sadolin and TIC Copenhagen) and Xenotest (BAM and EMPA) equipments, and one institute (PRL) to use the Marr and natural weathering exposure. Imperial College offered to carry out treatments and application of coatings. The chemicals included at the suggestion of participants were: Preventol A4 (PA4 1.0%), Phenyl mercury succinate (PMS 1.0%), Nopcocide N96 (N96 1.5%), Pentachlorophenol (PCP 5.0%), Thiocyanomethyl Thiobenzothiazole (TCMTB 1.0%), and Troysan Polyphase (TRP 1.0%) all applied in 50:50 white spirit: linseed oil which served also as a control.
A F Bravery, D J Dickinson