Effect of Preservative Salts on Properties of Hardwood Veneer

Toughness of specimens from three species of wood was evaluated at seven retention levels for each of four preservative formulations–Boliden Salt, Chemonite, Celcure, and copper chromate. Toughness of sweetgum and yellow-poplar was not significantly affected by any of the preservative salts. The toughness of blackgum was reduced to an important extent by three of the salt formulations–Celcure, Chemonite, and Boliden salts. Variations in toughness among blackgum specimens were strongly correlated with retention level. Embrittlement of the test specimens was assessed qualitatively from the number which remained attached following toughness tests and by particle-size distribution after grinding. Specimens of all these species showed evidence of having been embrittled by the treaments. All of the preservative treatments had an effect on the composition of the test specimens. Reduction in total carbohydrate content in all species was a direct function of retention level. Results indicate that retentions of 1 lb./ cu ft. or more could seriously impair the strength properties of veneer or other thin materials.

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