The corrosivity of various borate treated wood materials (Tim-Bor®-treated southern yellow pine, spruce-pine-fir, Douglas fir, and Borogard® ZB treated OSB) on common metals for fasteners (aluminum AL1514, brass CDA230, mild steel C1010, and hot dipped galvanized steel) has been tested using accelerated laboratory conditions in accordance with AWPA Standard E12-94. Corrosion rates of 1 to 5 mpy are considered excellent, and corrosion rates less than 1 mpy are considered outstanding. The observed corrosion rates were all below 3.5 mpy. Aluminum and brass had outstanding relative corrosion resistance, while mild and galvanized steels exhibited excellent relative corrosion resistance to the tested treated wood materials.

Unlike with other treated wood products, standard metal fasteners can be used with borate pressure treated wood (please check your local building code and NER-648).

Contact us at wood@borax.com to request additional information.