Permacure Oxide Liquor – CCA

CCA (chromated copper arsenate) is the world’s most versatile wood preservative product and has the best track record of any wood preservative on the market. It is easy to work with and the most competitive from a cost perspective.

Timber treated with Permacure CCA will have an appealing light green appearance that will fade over time to a platinum grey.

Our Permacure CCA is sold to 13 countries across the world, meeting international standards. Government engineers, builders and farmers agree that the product has proven itself due to its efficacy and reliability.

Permacure can only be applied through vacuum-pressure impregnation.

cca treated timber


CCA is one of the world’s most widely uses wood preservatives and has been used since the early 1930s.

Permacure CCA is a water-soluble formulation consisting of three metal oxides: copper oxide (CuO), chromium trioxide (CrO3) and arsenic pentoxide (As2O5). The three metals in these oxides, namely copper, chromium and arsenic, are the key actives. The synergistic action of these three actives is the foundation for the extraordinary effectiveness of CCA.

Permacure CCA is used to provide long-term protection against attack by wood-destroying fungi, insect larvae and termites, and is applied by vacuum-pressure impregnation. Permacure CCA is widely used for structural timber, agriculture poles (pine and eucalyptus) and transmission poles. It is effective for any hazard class.

Function of the actives

Copper (Cu) has been used for centuries to inhibit the reproduction of bacteria and to prevent the growth of many fungi, including Lenzites trabea, Poria monticola and Lentinus lepideus. The role of copper in Permacure CCA is as a primary fungicide and bacteriostatic agent. While it does not directly kill fungicidal or bacterial organisms, it prevents them from using preserved timber as a potential food source, protecting the wood from brown rot (Armillaria), dry rot (Serpula lacrymans) and other wood-destroying bacteria.

Chromium (Cr) acts as a fixation agent within CCA. Due to its presence, the CCA preservative is deeply and permanently bonded to the fundamental chemical components of the wood.

While vacuum-pressure impregnation allows the preservative to penetrate deeply into wood, the chromium ensures that movement of moisture into and out of timber does not remove the preservative.

Arsenic (As) is a naturally abundant metalloid occurring as a common mineral in many important ores and is also present in many types of seafood. It has been known since the 13th century and has since been used as a herbicide, fungicide and insecticide. Arsenic is used in Permacure CCA as both a secondary fungicide, making the wood resistant to even copper-resistant fungi, and also as an insecticide, protecting wood from attack by xylophagous and detrivorous wood borers (Lyctinae); termites (Termopsidae) and other wood-destroying insects.