Treatment of Spruce Roundwood with a New CCA Preservative – Part I: Preservative Retention and Penetration

The influence of initial MC and treatment temperature on the retention and penetration of a new Copper-Arsenic-Additive preservative (CAA) into spruce roundwood was tested in 36 individual pressure treatments. Four-foot-long spruce pole stubs were arranged in three categories of initial MC and treated as pairs of end-matched samples at 120?F and 170?F in a 4-1/2-hour full-cell process. Preservative retentions decreased with increasing initial MC, while preservative penetrations increased in thick sapwood accessible to the preservative. The influence of steaming on initial MC distribution in pole stubs was also studied.

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