Acetylated wood products are made by treating wood with acetic anhydride, a chemical derived from acetic acid. This process modifies the wood's cellular structure, making it more resistant to moisture, decay, and insect damage. As a result, acetylated wood is often used in outdoor applications, such as decking and siding, where durability is essential. The acetylation process also reduces the wood's tendency to warp or shrink, enhancing its stability. These products are considered environmentally friendly since they use renewable resources and do not require toxic preservatives. Acetylated wood is gaining popularity in sustainable construction and landscaping.