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Alkaline copper quaternary

Alkaline Copper Quaternary (also known as ACQ) is a water based wood preservative method recently introduced in countries where there is a demand for alternatives to the more chemically harmful Chromated copper arsenate (CCA). The treatment is made up of copper, a bactericide and fungicide which makes the wood resistant to biological attack, and a quaternary ammonium compound (quat) which acts as biocide, increasing the tolerance of treated timber to copper-resistant bacteria and fungi, and also acting as an insecticide. ACQ has come into wide use in the USA, Canada, Europe, Japan and Australia following restrictions on CCA, as ACQ is seen as a [[#147]]greener[[#148]] preservative and a more sustainable option.

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