UV Weathering

UV sunshine UV weathering test
Long term exposure to sunlight can cause photo-degradation of many different materials. The non-visible UV radiation characterised by short wavelengths are responsible for much of the photo-degradation, a process that initially results in breaking down the surface molecular structure.

This frequently results in a deterioration of the physical properties such as colour change, chalking and/or flaking but can also affect mechanical properties such as tensile and wear resistance (see Taber Abrasion).

As an example, coatings such as paints or varnishes may lose their flexibility and become brittle. Plastic decorative and structural mouldings may yellow and lose their original aesthetics as well as their strength.

When the light stability of a given material or the performance of a UV stabiliser needs to be assessed, artificial accelerated weathering tests have been developed using light sources such as daylight filtered xenon arc providing good correlation to full sunlight spectrum up to the near infra-red, or exposure to the shorter UV wavelengths only using fluorescent lamps under controlled conditions in accordance with international standards such as the various cycles ISO 16474 and ISO4892.

For more information regarding our UV weathering and environmental testing facilities, please do not hesitate to contact us to further discuss your requirements.



  • Would you be able to carry out uv Testing on our WPC decking (wood Plastic composite)

  • Good morning,

    We are looking to get a few samples tested under accelerated UV to assess stability over the course of a year.
    Is this something that you can offer and how long does the process normally take?

    Kind regards,

  • Hi
    I work as a traditional rigger at the National Museum of the Royal Navy based Portsmouth.
    We are looking to replace the hammock netting which surrounds HMS Victory’s deck with modern materials in a traditional style, using a combination of hempex rope and spun yarn both made of polypropylene. The man hours involved in making the hammock netting are significant hence we want to ensure we use materials which will last.
    We have been offered various products by different manufacturers, with varying degrees of UV protection, and would be interested in the possibility of undertaking UV tests on three different options to assess how long each may last.
    Is this the sort of test you can advise on? What are the options and costs associated with this sort of test? Would you want samples of the basic materials or a section of hammock netting made up?
    Thanks in advance

  • hello

    I don’t know if this is something you do, I am after a price for weathering some resin bound blocks, the test method is BS EN 13892-2:2002, the blocks are 160mm x 40mm x 40mm.
    We need to weather 12 of them, for 2000 hours, to BS EN ISO 16474-3, Method A, cycle no 1.
    then returned to us to test the physical properties.

    Thanks in advance


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