Overview
Chromated Copper Arsenate (CCA) is a chemical preservative mixture developed in the 1930s to protect wood from biological degradation. It consists of copper (fungicide), chromium (fixative), and arsenic (insecticide) compounds dissolved in water. CCA revolutionized the timber industry by enabling the production of durable, low-maintenance wood products for harsh environments. The preservative works through pressure treatment, where wood is placed in a vacuum chamber to impregnate the solution deep into the cellular structure. This process creates a permanent bond between the chemicals and wood fibers, ensuring long-term protection even in ground contact or marine applications.
Physical and Chemical Properties
CCA exists as an aqueous solution with a distinctive green color before treatment. The active components include copper oxide (CuO), chromium trioxide (CrO3), and arsenic pentoxide (As2O5), typically in a 4:3:1 ratio for standard formulations. After treatment and fixation (a chemical reaction catalyzed by chromium), the compounds become insoluble in water. The fixation process typically requires 24-72 hours depending on temperature and humidity. Fixed CCA demonstrates exceptional resistance to leaching, with less than 5% of preservative loss over decades of service. The copper provides protection against fungi, while arsenic acts as an insecticide, particularly effective against termites and marine borers.
Main Applications
CCA-treated wood has been extensively used in industrial and agricultural applications where durability is paramount. Common uses include utility poles (extending service life to 40+ years), marine pilings (resistant to saltwater organisms), and permanent wood foundations. It's also specified for highway construction (guardrail posts, sign supports) and agricultural buildings exposed to moisture. In the past, CCA was common for residential decks and playground equipment, but most countries have phased out these uses due to arsenic exposure concerns. Today, its use is largely restricted to industrial applications where alternative preservatives cannot match its performance, particularly in high-hazard environments like saltwater exposure or ground contact.
Safety and Storage
CCA requires careful handling due to its arsenic content. Workers should wear chemical-resistant gloves, goggles, and respirators when handling concentrate or freshly treated wood. The solution must be stored in clearly labeled, corrosion-resistant containers separate from acids and food products. Post-treatment, wood should be allowed to fully fix (typically 72 hours) before handling without PPE. Cutting or sanding CCA-treated wood generates hazardous dust - always use dust collection systems and proper respiratory protection. Disposal must follow hazardous waste regulations; burning CCA wood is strictly prohibited as it releases toxic arsenic trioxide fumes.
B2B Procurement Guide
When procuring CCA-treated wood, verify the treatment meets relevant standards like AWPA (American Wood Protection Association) Standard C2 for lumber or C18 for poles. Key specifications include retention levels (typically 0.25-0.40 pcf for above-ground use, 0.60-0.80 pcf for ground contact). Consider the project's environmental regulations - many regions restrict CCA for certain applications. Alternative preservatives like ACQ or micronized copper may be required. For structural components, ensure the treatment process doesn't compromise mechanical properties. Always request documentation including treatment stamps, safety data sheets, and compliance certificates.
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