In September 1983, Document No: IRG/WP/2208 was distributed giving guidance on sampling after 8 months exposure and including tables on which to record the test results. Similarly in September 1984, Document No: IRG/WP/2233 was distributed concerning sampling after 18 months exposure. No major problems have been notified to Princes Risborough Laboratory concerning the sampling method. It is therefore proposed that the last sampling, after 4 years exposure for all those L-joints exposed in 1983, should proceed using the same methodology, during April or May 1987 as agreed at IRG-17 in Avignon.

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