Field Trials with Ammoniacal Copper Borate Wood Preservative

During 6 years’ exposure in the ground, southern pine sapwood stakes (2 by 4 by 18 in.) treated with ammoniacal copper borate (ACB) have not resisted decay and termite attack as well as stakes treated to similar retentions of ammoniacal copper arsenate (ACA). Nearly all of the boron was leached from stakes treated to low to moderate levels (0.2 to 0.4 pcf) of ACB after exposure in Mississippi for 2 to 4 years. Small ACB-treated southern pine sapwood panels showed light to heavy marine borer attack after 6 years in the sea at Key West, Fla. At the highest retention, (2.5 pcf), panels were unattacked. The wood preserving value of ACB is primarily due to copper. ACB is not as suitable for wood protection as ACA where the degradation hazard is high.

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