Accoya® Wood Technology Changes Wood on a Molecular Level
The Problem: An abundance of chemically unstable groups in wood called “free hydroxyls” attract moisture through hydrogen bonding,
causing wood to swell and shrink and creating an attractive environment for wood-decaying fungi and destructive insects
Our Solution: The non-toxic acetylation process upon which Accoya® wood production technology is based blocks cyclical absorption. Acetylation effectively changes the free hydroxyls within the wood to stable acetyl groups.
The acetyl levels of Accoya® wood surpass those of even in the most naturally durable wood species
Acetylation: The ideas behind the innovation
Wood fibres contain an abundance of chemical groups called ‘hydroxyls’ (-OH) absorb or release water causing
wood fibres to swell & shrinkone of the principal reasons that wood is prone to decay
Acetylation transforms the hydroxyl groups to (also naturally occurring) acetyl groups, causing a strong reduction of water
- A non-toxic, fully recyclable wood
- Modification to the core Can be cut or profiled without exposing unprotected surfaces
- Acetylated wood, changed at molecular leve
- A high durability achieved by stopping the rot fungi from digesting wood, not by killing them with toxi
Cellular structure of softwood
Dimensional stability and water uptake
Fibre Saturation Point
± 25 % wood moisture content
< 25% mc “bound” to cell wall
> 25% mc also “free” water in cell lumen
The Accoya® Wood Production Process
The Benefits of Accoya® Wood
- Institutes around the world have been running long term exposure trials of acetylated wood
- Including: USDA Forest Products Lab, BRE, UK, SHR, NL, Asia- China
Performance in all conditions positions our data as robust
AWPC 5604 Mastotermis testing Northern Territory, Australia
Testing results at the Louisiana State University and Mississippi State University following the rigorous testing protocols of the American Wood Protection Association (AWPA).
Accoya® wood offers outstanding durability against the most destructive of termites, having more than 20 times the resilience of untreated wood.
Thermal conductivity in wood is a function of moisture content & density. Accoya has advantages in both compared to hardwood, & in moisture content for softwood.
Hiroshima Technology Research Institute, Japan
Test of radiant heat on Accoya, WPC and thermo-wood decking. Major advantage for Accoya evident in thermograph images
Thermographs made on a sunny day with ambient temperature of 30°C
Accoya® Wood: A Green Building Material - Ecolabels for accoya®
1 of the 5 Naresuan test sites, left & close up of the old growth Burmese teak tested alongside Accoya &