The use of wood outdoors is susceptible to being attacked by wood destroying organisms, specifically fungal decay and termites in a tropical environment. To overcome this disadvantage, non-durable wood can be treated with preserving chemicals. Rosin is a natural product, it has a good hyd-rophobic c-haracter, and is human-friendly. In this study, Styrax tonkinensis (Pierre) and Acacia hybrid (Acacia mangium x auriculiformis) woods were impregnated with the mixtures of 1%, 2%, 4% rosin sizing agent, and 3% copper sulfate. After that, all of the specimens were exposed to environmental conditions in the field for 12 months, while the effects of rosin sizing - copper sulfate treatment on the durability of wood were evaluated. Results showed that the penetration of the rosin sizing agent - copper sulfate formulations into the wood were relatively uniform, however, in competition with the Acacia hybrid the penetration of the mixture of rosin sizing agent - copper sulfate into Styrax wood was better. After 12 months of exposure to the natural testing ground, the untreated control samples had higher weight loss values and lower protection levels than those of samples treated with rosin sizing agents alone or in combination with copper sulfate of both wood species. The concentration of rosin used in this study did not affect the durability of wood. It appears that wood after being preserved by rosin sizing - copper sulfate solutions had a certain effect on fixation of the copper preservative in wood and significantly improve their resistance against wood decay, as well as termite so that their service life can be extended during their utilization.
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