Stability of preservatives was determined by gaschromatographic analysis when they were applied to glue-line treatment of plywoods. Among organophosphorous insecticides, emulsified forms of chlorpyrifos, dichlofention and diazinon were more stable than others. Fenitrothion, pyridafenthion and phoxim were not practically acceptable as emulsifieable forms due to the relatively low recovery rates after an accelerated ageing (heat exposure at 60°C after hot-press). IF-1000, an organoiodine fungicide, seemed to be less stable under the influence of heat, although the fungicide was better than the other tested organoiodine chemical (Sunplas).

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