Acetylated Wood (Accoya), various profiles (19mm, 25mm, 32mm, 38mm, 50mm)
Accoya acetylated wood transforms fast-growing FSC-certified Radiata Pine (Pinus radiata) into a Class 1 durable timber through molecular-level chemical modification. The acetylation process replaces hydroxyl groups in wood cell walls with acetyl groups using acetic anhydride, reducing moisture absorption by approximately 80% and delivering exceptional dimensional stability (radial shrinkage 0.4%, tangential 0.8% wet to 65% RH — compared to 4.8%/7.6% for Douglas Fir). The result is a non-toxic, biocide-free material with tropical hardwood performance from sustainably sourced softwood, backed by an industry-leading 50-year above-ground and 25-year in-ground warranty. Available in multiple profiles from 19mm to 50mm for cladding, decking, windows, doors, and structural joinery.
- External window and door frames
- High-performance cladding systems
- Marine and coastal construction
- Premium decking and outdoor furniture
- Structural millwork and joinery
- Commercial and residential exteriors
- Heritage restoration projects
- Extreme climate applications
Wood acetylation was first studied in the 1920s as a laboratory technique, but commercial viability proved elusive for decades due to cost and process control challenges. Accsys Technologies (originally Titan Wood) achieved the commercial breakthrough in the early 2000s, establishing their first production facility in Arnhem, Netherlands. The Accoya brand launched commercially in 2007, with production capacity expanding to meet growing global demand. The acetylation process was refined to deliver consistent quality at industrial scale — each batch is tested to ensure minimum acetyl content thresholds are met. Britton Timbers became the Australian authorised distributor, establishing national supply chains. Accoya Color Grey (through-core grey stain) was introduced as a pre-finished product addressing the demand for weathered timber aesthetics. A second manufacturing facility was established in Malaysia to serve Asia-Pacific markets.
DISCLAIMER: This specification document is generated from the CLAD Materials Atlas Database. Information is for general guidance only and does not constitute professional engineering advice. Values are typical and may vary by batch, manufacturer, and production run. Verify suitability for specific project applications independently.