Wood naturally contains some acetyl groups (that repel water) and a lot of free hydroxyl groups (attract water). Hydroxyls cause wood to swell when wet and shrink when it dries, making it attractive to biological organisms (insects and fungus).
Our process uses acetic anhydride — essentially strong vinegar — to boost the wood’s acetyl content (repel water), essentially replacing the hydroxyl groups, meaning water is no longer an issue. Accoya’s shrink and swell cycle is significantly reduced thereby making it an attractive wood alternative for a variety uses. Nothing is added to the wood that wasn’t already there; we are enhancing what is already there. What’s even better? It is naturally non-toxic making it safe for families, pets, and the planet.
The byproduct of the process, acetic acid, is part of the circular economy, used in other applications, and even turned back into acetic anhydride, offering a closed loop cycle.