Copper Chrome Arsenic (CCA) is a wood preservative that has been widely used to protect timber from decay, insects, and other wood-destroying organisms. It is composed of copper, which acts as a fungicide; chromium, which helps bind the preservative to the wood; and arsenic, which acts as an insecticide.

Australian Standards

1. AS 1604 Series: This series of standards specifies the requirements for preservative treatment of timber. It includes guidelines on the types of preservatives that can be used, the processes for applying them, and the performance requirements for treated timber.

2. AS 5604: This standard provides guidelines on the durability of timber and wood products, including those treated with preservatives like CCA.

Building Code of Australia (BCA)

The Building Code of Australia (BCA), which is part of the National Construction Code (NCC), sets out the minimum requirements for the design and construction of buildings and other structures. The BCA references various Australian Standards, including those related to timber treatment.

Key Requirements for CCA-Treated Timber

1. Usage Restrictions: In Australia, the use of CCA-treated timber is restricted in certain applications, particularly where there is a risk of human contact. For example, CCA-treated timber is not recommended for use in playground equipment, picnic tables, handrails, and other structures where frequent human contact is likely.

2. Labelling and Identification: CCA-treated timber must be clearly labelled to indicate that it has been treated with CCA. This helps ensure that it is used appropriately and that users are aware of the potential risks.

3. Handling and Safety: Workers handling CCA-treated timber must follow safety guidelines to minimize exposure to the chemicals. This includes wearing protective clothing, using appropriate tools, and following proper disposal procedures for waste materials.

4. Environmental Considerations: The use of CCA-treated timber must comply with environmental regulations to prevent contamination of soil and water. This includes guidelines on the storage, handling, and disposal of treated timber.