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Colorants are used widely in a variety of today's building materials, or in coatings applied thereon, to protect or decorate the finished product. Durability is a frequent requirement of the colorant, but few appreciate the many considerations that enter into its selection for this purpose.
This paper describes aspects of durability that may be important to the appearance and long-term life of the product, and the many factors of formulation and use that influence performance. Means of determining durability, including common pitfalls of accelerated testing, are discussed, and typical performance of commonly used colorants are reviewed.
plastics, building materials, colorants, pigments, dyes, durability, accelerated weathering
Technical service consultant, E. I. du Pont de Nemours and Co., Inc., Chemical, Dyes and Pigments Department, Chestnut Run Laboratory, Wilmington, Del.