Experiments using a vacuum oven to accelerate the evaporative loss of g-HCH from treated wood blocks have indicated that the method described in this paper has the potential to reproduce in a relatively short time the distributions and loadings of the insecticide that are found during natural ageing. By contrast, the wind tunnel removed the volatile material in a way not found in natural ageing and characterised principally by the rapid removal of material close to or on the wood surface. Theoretical considerations reinforced these practical observations indicating that the vacuum oven could provide a much quicker means of attaining the condition that is likely to exist in aged timber.

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