Integrated protection against lyctid beetle infestations. V. Selecting efficient schedules for pressure treatment of tropical hardwood lumber with polyborates

This research investigated pressure and nonpressure methods for treating imported hardwoods with polyborates. A series of studies was designed to determine the most efficient schedules for use with imported hardwoods. Effective treatment was obtained with both a Lowry treatment cycle and a simple vacuum process. Treatability varied depending on the species treated. Banak was much easier to treat than was obeche. Better penetration and retention were obtained with a disodium octaborate (TimBor) compared to an ammonium pentaborate/sodium sulfate solution (AmBor-S). Selective absorption from polyborate working solutions did not occur when solutions were reused for treating repetitive charges. The use of a final vacuum in the Lowry process removed approximately 5 pcf of water (about 20% moisture content) from treated stock.

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