Sapwood blocks prepared from red pine, ponderosa pine, southern yellow pine and hem-fir (a commercial mixture of western hemlock and amabilis fir) were treated with didecyldimethylammonium chloride, (an alkylammonium compound, AAC). After oven drying the blocks were vacuum impregnated with distilled water and subjected to a static leach cycle for 48 hours. The leachate was analyzed and the amount of AAC which leached from each wood species, calculated. The results showed that the leaching of didecyldimethylammonium chloride from ponderosa pine was not unusual, and that the amount of AAC leached for the various wood species increased in the order > red pine > ponderosa pine > southern yellow pine > hem fir.

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