This study investigated the effects of 4 preservative systems on physical, mechanical and mold-resistant properties of bamboo oriented strand board (OSB) panels bonded with urea formaldehyde resin. Preservative A (Zinc Borate), B (IPBC), C (AAC+Borate) and D (carbendazim + prochloraz) were incorporated with strands during blending at three loading levels. The results showed that the mechanical and physical properties of bamboo OSB experimental panels met the requirements for OSB/2 specified in the China Industrial Standard LY/T 1580-2000, with the exception of 24-hour water soaking thickness swelling properties of panels containing preservative C. The panels containing preservative A had the most excellent physical and mechanical properties while those containing preservative C presented the lowest quality, which indicated that addition of preservative C did have detrimental effects on the quality of panels. Of the 4 preservative systems, preservative B(IPBC) was proven to be the most promising as it fully inhibited the mycelia growth of the 3 experimental molds at the loading level of 0.5% and still provided the OSB panels with satisfactory physical and mechanical properties. Preservative A (Zinc Borate) and Preservative C (AAC+Borate) were tested to be only effective against the growth of Trichoderma lignorum at their corresponding highest loading levels, while preservative D showed no protection against the molds within the limit of this study.

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