Evaluation of diffusible preservatives using an accelerated field simulator

An accelerated field simulator was used to evaluate the effectiveness of eight diffusible preservative chemicals in preventing fungal attack of wood. Test samples were treated with the diffusible chemicals and then placed in the soil of the accelerated field simulator for 30 months. Samples were then tested for residual strength in a modified static bending test. Samples were also evaluated for fungal attack by visual and microscopic assessment. Both basidiomycete and “soft-rot” fungal attack was observed in most samples. In general, compounds containing creosote, sodium fluoride, or borate chemicals performed well in visual assessments, but samples treated with copper naphthenate retained the highest effective strength. Modulus of elasticity correlated well with the visual ratings of the samples in most cases; however, the visual rating system failed to predict the strength of some individual samples.

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