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  5. Cementwagen 9 maart 2011 10:19

    • Cementwagen

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    BRE Concludes That Accoya Wood Can Produce Windows With a 60 Year Life - 01/03/2011

    New report highlights superior durability, dimensional stability, coatings performance and life expectancy of Accoya® wood.

    In a new report, published in January 2011, BRE (Building Research Establishment) presents the compelling results of 13 year field tests comparing the rot and decay levels of acetylated L-Joints against non-acetylated L-Joints. BRE also assessed Accoya wood against traditional specification requirements and timber species commonly used for joinery.

    The findings position Accoya, a non-toxic and environmentally-sound timber, as one of the finest choices for use as a window frame.

    Dr Edward D Suttie, Director of the Timber Division at BRE, said: “We consider that a window prepared from Accoya wood will show significantly improved coatings performance properties. If the window is designed and built to the principles of best practice, factory finished using quality coatings, installed by competent contractors and linked to a recognised best practice maintenance and care package, it will provide a window of outstanding durability and dimensional stability that would meet a 60 year service life requirement.”

    LIFE EXPECTANCY

    BRE has concluded that Accoya wood can deliver a sixty year working life window, making a more financially viable option for timber windows than traditional joinery materials. Unlike some other woods used for external joinery, Accoya wood requires no preservation treatment. Preservative treatments can impact on the environmental qualities of a product as they can be toxic. This therefore allows Accoya wood to retain its exceptional environmentally-friendly, non-toxic status.

    L-JOINT FIELD TRIALS

    To create a worst case scenario for joinery products, simple mortice and tenon L-Joints were assembled, coated, the coating over the joint was broken, and then placed out of doors out of contact with the ground and exposed to the normal environmental and ecological factors at the BRE Garston field exposure site in Watford. In 1998, the L-Joints were installed south-westerly facing into the prevailing weather. Three acetylated L-Joints and three ASA (alkenyl succinic anhydride) preservative treated L-joints were tested and visually assessed after five, six, nine and 13 years’ exposure. This environment renders the timber susceptible to fungi that invade wood in the form of moulds, blue stain fungi, soft rot fungi and basidiomycetes.



    The most significant results were found after thirteen years of exposure. While the ASA-treated timber showed dramatic decay, with two of the three sample sets categorised as “failed”, the acetylated wood was in a very good condition, with just some discolouration and softened wood fibres – see images at top of release.

    In further investigation, BRE used the categories of life expectancy, durability, dimensional stability and coatings performance to assess Accoya wood against suitable Standards approved framework and to compare it with the common joinery timbers of Douglas fir, sapele, Scots pine, Siberian larch, western red cedar and preservative-treated timber.

    DURABILITY

    Taking safety and economic factors for windows into account, durability refers to a timber’s ability to resist attack from wood-destroying fungi and endure a long life of acceptable quality. Recommended durability levels for joinery are 4, 3 or 2, equating to a service life of 15, 30 or 60 yrs respectively. Holding Class 1 durability, Accoya is strongly resistant to attack from wood-detroying organisms, as hasbeen repeatedly proven in scientific experiements, tests and reports. The results of the latest BRE investigation position Accoya as the most durable timber for use in joinery, more durable than Douglas fir, sapele, Scots pine, Siberian larch, western red cedar (see table on next page).

    DIMENSIONAL STABILITY

    Timber applying for the joinery seal of approval has a service life assessed under terms of whether its dimensional movement is “small”, “medium” or “large”. Although there are no specific requirements for external joinery, the suitability of a timber is assessed under the same criteria. The dimensional movement of Accoya wood achieves the highest rating of “small”, superseding sapele, a commonly used joinery timber (see table below).

    Resistance to shrinkage and swelling are further categories used to measure dimensional stability. A 2007 SHR report also showed that Accoya wood was 80% more resistant to shrinking and swelling than unacetylated radiata pine, the timber used to create Accoya.



    LONGEVITY OF COATINGS

    This new BRE report also takes into consideration the proven superior performance of coatings achieved when using Accoya wood – a factor particularly important when choosing a timber for windows which will require a coating to help resist the elements. In a test now running over 9.5 years in natural weathering in the Netherlands, the unmodified control had lost most of its coating whereas the acetylated wood is still performing well. In this same decade-long trial, the dimensional changes of acetylated wood were reduced by 80% and adhesion tests revealed a consistently good adhesion on the acetylated wood, another extremely important factor for high quality factory made windows.



    Notes to Editors:

    BRE is an independent and impartial, research-based consultancy, testing and training organisation, offering expertise in every aspect of the built environment and associated industries. We help clients create better, safer and more sustainable products, buildings, communities and businesses - and we support the innovation needed to achieve this. www.bre.co.uk

    For press information:

    Carole Graham: carole@fuelrefuel.com +44 (0) 20 7498 8211

    Catherine von Altheer catherine@fuelrefuel.com +44 (0) 20 7498 8211

    Link: www.accoya.com/news_details.asp?news=153
  7. [verwijderd] 9 maart 2011 11:27

    • [verwijderd]

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    Achtergrond informatie is heel belangrijk om een duidelijk beeld te krijgen van het bedrijf Accsys.

    Bijvoorbeeld zijn er werknemers bijgekomen: ja
    Is de omzet Alcoahout omhoog gegaan: ja

    Dit haal je inderdaad uit diverse info die te vinden is op hun of via hun site.

    Zodra er iets te vermelden valt inzake Acssys krijg ik dat op mail binnen.

    Kun je instellen bijvoorbeeld bij GMAIL
  13. arreno 9 maart 2011 13:40

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    Het gaat de verkeerde kant op. Ik dacht dat de emissieprijs de bodemprijs was maar het tegendeel blijkt. Alles wat beneden de 0,15 weggaat is toch dik verlies. Dus erg vreemd dat er lager handel is
  16. [verwijderd] 9 maart 2011 13:46

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    quote:

    konijnvan10euro schreef:

    Heeft er ook iemand Alex? Wie kan verklaren waarom de koers daar gewoon op 0,15 blijft hangen?
    Koers staat bij Alex gewoon op 0.14 met 874.000 stukjes
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