Residual Chemicals in Pressure Treated Wood: Understanding the After-Drying Process
Pressure treated wood is commonly used in construction and landscaping due to its resistance to insect infestation and decay. However, many homeowners and professionals have concerns about the presence of residual chemicals in the wood after it has dried. This article aims to clarify these concerns by explaining the pressure treating process and the composition of the wood.
What is Pressure Treated Wood?
Pressure treated wood is a type of wood that has been treated with preservatives to enhance its durability and resistance to insect damage, microbial decay, and weathering. The wood is placed in a pressurized chamber where these preservatives, typically copper-based chemicals such as copper sulfate or chromated copper arsenate (CCA), are forced into the wood to form a barrier against various threats.
The Pressure Treating Process
The process involves placing the wood in a sealed chamber and subjecting it to high pressure to force the preservatives into the wood#39;s cellular structure. This ensures that the chemicals penetrate deep into the wood, providing long-term protection against insect and fungal attacks.
Post-Treatment Residual Chemicals
After the wood has dried, the preservatives remain within the wood cells as part of the cellular structure. This is why the pressure treated wood is so effective in resisting insect infestations and microbial decay. The wood is designed to keep the preservatives in place for extended periods, ensuring sustained protection.
Use and Disposal of Pressure Treated Wood
Safe Use: When handling and using pressure treated wood, it is important to follow safety guidelines. Although the preservatives are sealed within the wood, accidental cuts or abrasions can expose the skin to these compounds. Therefore, wearing protective gloves and avoiding contact with the skin or eyes is essential.
Proper Disposal: Due to the presence of toxic compounds, it is not advisable to burn pressure treated wood as the ashes can release concentrated amounts of these toxic chemicals, posing a significant health hazard. Proper disposal methods include recycling or landfilling, as specified by local regulations.
Conclusion
In summary, pressure treated wood contains residual chemicals that remain within the wood cells after the treatment and drying process. These chemicals are crucial for the wood's protective properties, making it an excellent choice for outdoor and structural applications. However, safe use and proper disposal are essential to ensure both human and environmental safety.