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Timber Windows that last a lifetime

ACCOYA The World’s Leading High Technology Wood

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. Our windows, doors and conservatories can all be specified with Accoya.

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.



- 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

CLASS 1 DURABILITY - The most durable wood possible

LONG LASTING     Lasting at least 50 years above ground and  25 years in ground

PERFECT FOR COATING - Easier to coat: less preparation and sanding between coatings required.

NATURALLY BEAUTIFUL WOOD - The process does not compromise the wood’s natural beauty

IMPROVED INSULATION – Accoya offers improved thermal insulation in comparison with commonly used wood species

FROM SUSTAINABLE SOURCES - Sustainably sourced, including from FSC, PEFC and other regionally certified woods

UV RESISTANT – Accoya  wood has superior resistance to UV degradation when translucent coated and its natural appearance lasts longer

RETAINED STRENGTH & HARDNESS - The process does not compromise the wood’s strength
- Hardness is increased - High strength to weight ratio, making it suitable for challenging applications

100% RECYCLABLE - Fully reusable and recyclable - Reuse is recommended but Accoya  wood may be safely incinerated for bio-energy or composted

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. 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 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