Use of Preservatives in Board Products

A general article outlining the present position and problems of the wood fiber insulating board industry with respect to preservative treatment. Includes an excellent bibliography with 49 references. The types of preservatives and methods of preservative treatment used on wood products may not be suitable for fiberboard. Furthermore, the standard soil-block or soil bearing test are much too severe for evaluating the performance of preservative-treated fiberboard. The list of chemicals used to render fiberboard free from attack by destructive organisms is practically the same for solid wood. In addition to coal-tar and petroleum derivatives (including asphalt), metallic or arsenic compounds were among the first to he used in fiberboard. By the middle 1930s investigations on chlorinated phenols were underway. Studies with the 8-hydroxyquinoline applied during the storage of wet lap have been made. The present procedure introduces preservative chemicals prior to the formation stage and depends on the disbursed particles clinging to the fibers. A retention of 80 percent is considered high. It is generally recognized that not enough information is available concerning the level of treatment needed to assure protection under actual use conditions.

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