An Accelerated Weathering Survey of Organic Red Pigments

Performance expectations of high chromatic colorants, especially organic reds have increased over the years along with the popularity of bright outdoor colors. Pigment reds including 112, 188, 209, 254, 255, and 272 will be compared via Xenon arc accelerated weathering as colorants in commercial exterior bases with different levels of titanium dioxide (ultra-deep base and medium tint base). Measurements discussed compare CieLAB, Delta E, and strength at 500, 1000, 1500, and 2000 hours in a Q-Sun Xe 3HS weathering incorporating ASTM G-155 Cycle 3; Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials. It is worth noting that each of these pigments possesses a firm place in industry because they satisfy some need which exists in the market. The importance of this comparison is to assist the user in determining the proper red pigment for their application. The value of these pigments will also be compared with respect to relative cost and weathering performance. Also, an evaluation of weathering with respect to base dependence revealed interesting results worth discussing.


Jerry Powers is the Technology Manager –Coatings Americas for Chromaflo Technologies headquartered in Ashtabula, Ohio where he has been for 22 years. He currently manages the Development group and the Analytical group. His responsibilities include new technology and development of colorants for the Architectural, Industrial, and Maintenance Markets. Jerry received his undergraduate degree in Chemistry from Allegheny College and his Masters of Science from Cleveland State University.