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Light Stabilization Toolbox

SpecialChem / Mar 24, 2010

UV protection of coatings is today often regarded as a mature and well-established technology. This may be true of certain traditional applications; however, the increasing use of materials requiring coverage or enhanced protection at specific wavelength ranges, along with novel resin technologies or low film builds, has resulted in a variety of new light stabilizer developments that now allow tunable protection from the UV to the near-visible range. Today, a wide range of light stabilizers provides solutions both for water- and solvent-based technologies, enabling paint companies to adjust the level of protection needed to achieve top performance in their specific applications. Following a short summary of the various UV absorber chemistries developed over the years, both the absorption and the transmission characteristics of the various classes (including combinations thereof) are discussed below. Depending on the application and, in particular the sensitivity of the substrate used, suitable spectral coverage, as well as sufficiently high extinction at certain wavelengths, need to be recognized as important criteria in the selection of stabilizers.

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