Accoya Timber
Posted by McNally Joinery on November 18 2011 @ 09:34
McNally Joinery are pleased to accounce their new Accoya range of joinery, including the Award Winning A rated Accoya triple glazed window. Please find some information on Accoya below.
Great Wood for the Great Outdoors
The following has been sourced from www.accoya.com
While mankind may hate extremes of cold, wet and even heat, Accoya® wood can withstand the toughest environments. Accoya® wood has been tested over prolonged periods in all types of weathering conditions, above ground, below ground and even in water. Not only is its durability proven, but it has also been shown to retain its appearance, requiring much less frequent maintenance than other wood species. This gives added reassurance to manufacturers, architects, specifiers, builders and property owners alike and makes Accoya® wood the ideal choice for a diverse range of external applications.
Accoya® wood is a “new wood species” whose performance credentials have been extensively researched and repeatedly demonstrated. Accoya® wood has properties that match those of the best tropical hardwoods, yet is manufactured using a non-toxic treatment and wood from sustainable sources. In fact, it may seem too good to be true… but Accoya® wood really exists.
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.
Acetylation
The technology behind Accoya® wood is based on wood 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 adsorb water is greatly reduced, rendering the wood more dimensionally stable and, because it is no longer digestible, extremely durable. Acetylation effectively changes the free hydroxyls within the wood into acetyl groups.
More information on Accoya is available at www.accoya.com
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