Accoya® is the world’s leading high technology wood. Created from sustainably sourced softwood, Accoya® wood matches or exceeds the durability, stability and beauty of the very best tropical hardwoods.
The Accoya® wood production process takes sustainably-sourced, fast growing softwood and, in a non toxic process that ‘enables nature’, creates a new durable, stable and beautiful product – that has the very best environmental credentials.
A new world of high performance, sustainable, low maintenance products – including windows, doors, decking, cladding and glulam structural beams – is opened up by Accoya wood. The exceptional properties of durability, stability, strength and beauty have even led to Accoya wood being used as the main construction material in a heavy traffic road bridge with a highly original design.
Accoya is helping to protect the world’s precious hardwood resources and is guaranteed for 50 years in exterior use and 25 years when used in the ground. This long life also provides an added benefit – helping to reduce carbon emissions.
Accoya® wood creates beautiful and sustainable possibilities, even in demanding applications
Wood is good. The possibilities it offers can be seen wherever we look: as sturdy decks or decorative trims, winter fuel or stylish furniture, musical instruments or industrial structures, window frames or walking sticks. Wood is a material that is both aesthetically appealing and endlessly practical. It is also our only naturally renewable construction resource.
The natural beauty and versatility of wood are fundamental to its universal popularity. When properties such as high strength, light weight and good insulation are required, wood becomes the ideal choice for many applications. Unfortunately, these compelling attributes are offset by the susceptibility of many wood species to deterioration, particularly when used outdoors.
Historically, the use of inherently durable tropical hardwoods and the application of toxic chemicals to non-durable wood have provided partial solutions to the problem of durability. However, the wood’s dimensional stability is not improved and toxins create a disposal problem. If an alternative existed which was sourced from sustainable forests, had zero toxicity and provided dimensional stability and durability that exceeded even the best tropical woods, a perfect material would have been found.
Accoya® wood is the world leading solution with properties that match those of the best tropical hardwood. Accoya® is manufactured using a non-toxic treatment and uses fast growing timber from sustainable sources. In fact, it may seem too good to be true but Accoya® is proven and available today.
Extensive laboratory and field testing by leading institutes around the world (including in New Zealand, USA, UK, Sweden, Malaysia, Indonesia, Russia, the Netherlands and Japan) has shown the performance of acetylated wood to be extremely reliable.
Accoya® wood has been thoroughly tested for dimensional stability, durability, UV resistance, paint retention and in-ground conditions to ensure optimal performance. Indeed, it is so reliable that for many years it has been – and continues to be – used by scientists as the benchmark against which other treatments and modifications are measured.
- Swelling and shrinkage reduced by 75% or more
- Doors and windows open effortlessly year round
- Paints and varnishes last 3 or 4 times longer,
greatly reducing maintenance costs
- The most durable wood possible
- More durable than teak and the world’s other
most durable woods
- Perfect for outdoor use
- Lasting at least 50 years above ground and
25 years in ground
- Accoya® wood is indigestible to insects and microorganisms
and is therefore more resistant to decay
- Barrier to wood-destroying fungi
- Accoya® wood is virtually rot-proof
- Easier to coat: less preparation and sanding between
coatings required
- Improved dimensional stability and UV resistance
improves the life of coatings
- Perfect for transparent, translucent and opaque coatings
- The process does not compromise the wood’s natural
beauty
- Accoya® wood offers improved thermal insulation
in comparison with commonly used wood species
- Accoya® wood is ideal for applications where energy
conservation is important
- Accoya® wood is non-toxic, protecting the
environment from the harmful effects of poisons leaching
out of typical wood treatment
- Accoya® wood may be safely reused and recycled
- Sustainably sourced, including from FSC, PEFC and
other regionally certified woods
- Naturally renewable
- Accoya® wood has superior resistance to UV
degradation when translucent coated and its natural
appearance lasts longer
- Accoya® wood is the ultimate substrate and coating
life is increased
- The process does not compromise the wood’s strength
- Hardness is increased
- High strength to weight ratio, making it suitable for
challenging applications
- Fully reusable and recyclable
- Reuse is recommended but Accoya® wood may be
safely incinerated for bio-energy or composted
- Consistent, measurable modification quality from
surface to core
- No need to apply chemical preservatives when cut or
planed
- Accoya® wood is easy to machine and process
manually, creating no challenges for product
manufacturers and end users
- Produced from abundantly available, fast-growing sources
species such as Radiata Pine.
The technology behind Accoya® wood is based on acetylation, a process that has been studied by scientists around the world for more than 75 years. This method of improving wood has been proven to deliver such superior performance that it has long been used as the “gold standard” against which other methods are measured.
The physical properties of any material are determined by its chemical structure. Wood contains an abundance of chemical groups called “free hydroxyls” (represented as OH in the picture). Free hydroxyl groups adsorb and release water according to changes in the climatic conditions to which the wood is exposed. This is the main reason why wood swells and shrinks. It is also believed that the digestion of wood by enzymes initiates at the free hydroxyl sites – which is one of the principal reasons why wood is prone to decay.
Acetylation effectively changes the free hydroxyls within the wood into acetyl groups. This is done by reacting the wood with acetic anhydride, which comes from acetic acid (known as vinegar when in its dilute form). When the free hydroxyl group is transformed to an acetyl group, the ability of the wood to absorb water is greatly reduced, rendering the wood more dimensionally stable and, because it is no longer digestible, extremely durable