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Outstanding Performance

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.

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The world's most environmentally friendly rooflight


Indigestible to a wide range of insects, including termites Greatly reduced vulnerability


From FSC®, PEFC™ and other regionally certified woods Naturally renewable


Consistent, measurable modification quality from surface to core No need to apply chemical preservatives when cut or planed


The process does not compromise the wood's strength Hardness is increased High strength to weight ratio makes it suitable for challenging applications


Superior resistance to UV degradation when translucent coated Natural appearance lasts longer The ultimate substrate and coating life is increased


Offers improved insulation in comparison with commonly used wood species Ideal for applications where energy conservation is important


Process does not compromise the wood's natural beauty


Protects the environment from the harmful effects of common treatments May be safely reused and recycled


© Accsys Technologies is the trading name of Titan Wood Limited and a wholly owned subsidiary of Accsys Technologies PLC. ACCOYA® the Trimarque Device and the icons are registered trademarks owned by Titan Wood Limited, and may not be used or reproduced without written permission

42-Month Accoya External Coating Test – TRADA

Leading timber research institute, TRADA, was commissioned by Accsys Technologies to provide an update on a series of exposure trials.

The ongoing trials using the same coating began in February 2007 in Buckinghamshire, England and tested Accoya® cladding board’s resistance to natural weathering and splitting in comparison to pine and Siberian larch.

After 42-months, Accoya® wood was found to outperform the competing cladding boards in a number of ways – showing excellent coating performance. Pine cladding boards showed severe levels of fissuring, resin exudation, end fissuring, paint peeling over fissures,

9.5-Year External Coating Test – SHR

Independent testing institute SHR Timber Research in The Netherlands conducted a comprehensive coatings test on Accoya® and untreated wood with opaque paints and stains.

Accoya® wood outperformed all other timbers, with better coating performance and superior coating adhesion in both wet and dry conditions. The white opaque performed extremely well, requiring no maintenance after 9.5 years – which is an important benefit in the long-term life cost of the product and ensures that Accoya® has a superior whole life cost compared to competing materials.

13-Year Window L - Joint Test – BRE

The BRE (Building Research Establishment) is an independent institute based in Watford, UK. In durability field testing to European Norm (EN) 330:1993 – which parallels America Wood-Preservers’ Association (AWPA) E9 – simple mortice and tenon joints (L-joints) are assembled, coated and placed outside, with the coating over the joint deliberately broken to allow typical water ingress. This test represents a worst case scenario for joinery products and requires the coated wood to be exposed to normal environmental factors.

In February 1998, L-joints were installed at the BRE Garston field exposure site (Watford, UK) facing the prevailing south westerly weather on an elevated test rig. The test remains in progress with inspections at regular intervals. The BRE reported: “In simulated accelerated joinery field trials that represent a worst case scenario joinery product by enabling moisture ingress into the joint pine, sapwood wood L-joints acetylated to a slightly lower modification level than Accoya®, after 13 years exposure in the UK are performing very well. The trial indicates that a permeable timber species that is acetylated through the cross section to a durability class 1 level (e.g. Accoya®), would have a grading lower than the reference preservative TnBTO – and thus Accoya® would exceed the biological reference value and would be deemed to provide sufficient protection for long life window joinery.”

11 16-Year Canal Lining Test

Accoya® wood’s high performance was proved with a 16-year project test from Waterschap Zuiderzeeland, near the junctions of the N301 and N305 Nijkerk – Zeewolde.

In April 1995, acetylated and control wood was used to line a canal. After 16 years of exposure to fresh water, the acetylated wood showed no sign of rot, decay or fungal damage – highlighting its class 1 durability status.

BS8417 indicates a 30 year service for durability class 1 in this fresh water scenario and Accoya® wood canal linings are showing real life positive results.

These canal bank conditions are particularly punishing, especially at the waterline, since the wood is exposed to a combination of water, microbe rich soil and air.

Flame Spread Test and Smoke Developed Test - SWRI

In March 2009, Southwest Research Institute undertook Flame Spread Tests and Smoke Developed Tests in accordance with the standard test method for surface burning characteristics of building materials NFPA 255 (ANSI, UL 723 & UBC 8-1).

The conclusion of the Flame Spread Test results is that Accoya® wood can be classified within the range of standard timber species and achieves Class C in this US rating system.

Wood / Species

Lodgepole pine
Sitka spruce

Flame Spread Index*


* data source - USDA - United States Dept of Agriculture Wood Handbook. Lower numbers equal a lower flame spread.

Flame Spread Classification

Class I (or A)
Class II (or B)
Class III (or C)

Flame Spread Rating or Index

0 - 25
26 - 75
76 - 200

Wood / Species

Yellow cedar
Eastern white pine
Lodgepole pine
Western red cedar

Smoke Developed Index*


* data source - USDA - United States Dept of Agriculture Wood Handbook. Lower numbers equal less smoke.

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Holsworthy EX22 6HL United Kingdom
Tel: 0330 300 1090
Tel: 01409 255120

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