Borate treatment of seasoned western hemlock and Douglas-fir lumber

Dry (12% moisture content), incised or nonincised Douglas-fir and western hemlock lumber was treated with sodium borate tetrahydrate and subjected to dip or pressure treatments. Gross retentions and boron penetration were higher in pressure-treated material, particularly when the wood was incised. Higher gross retentions were achieved in dry lumber than were found in previous tests with green lumber, but boron penetration was generally lower in the dry material. The treatment of lumber at slightly higher moisture contents might improve diffusion without adversely affecting solution absorption.

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