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).

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