Incorporation of non-polar additives into water-borne treatments through of emulsion technology can greatly improve the physical characteristics of wood in service. Of specific interest with these emulsions is their effectiveness in reducing the rate of wood swelling. We have observed that the presence or absence of preservatives can often significantly influence the resultant effectiveness of the water repellents when measured in an immersion swelling test. This paper describes some preliminary results of experiments comparing the relative effectiveness of a water repellent additive when used in combination with CCA-C as well as the effect of preservative concentration on water repellency.

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