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Introduction DION® resins are among the most established and best -recognized products in the corrosion -resistant resin market. DION® resins were originally developed for some extremely demanding applications in the chlor -alkali industry and their success has led to diverse and highly regarded applications. These products became part of the Reichhold family of resins in 1989 with the acquisition of the Koppers Corporation's resin division. Reichhold is a dedicated thermosetting polymer company offering a complete line of corrosion -resistant resin products and actively developing new resins to serve the changing needs of the industry. Using the DION® Chemical Resistance Guide The corrosion performance of DIONID resins has been demonstrated over the past 50 years through the successful use of a variety of composite products in hundreds of different chemical environments. Practical experience has been supplemented by the systematic evaluation of composites exposed to a large number of corrosive environments under controlled laboratory conditions. This corrosion guide is subject to change without notice in an effort to provide the current data. Changes may affect suggested temperature or concentration limitations. Laboratory evaluation of corrosion resistance is performed according to ASTM C-581, using standard laminate test coupons that are subjected to a double -sided, fully immersed exposure to temperature -controlled corrosive media. Coupons are retrieved at intervals of 1, 3, 6, and 12 months, then tested for retained flexural strength and modulus, barcol, hardness, changes in weight, and swelling/ shrinkage relative to an unexposed control. These data and a visual evaluation of the laminate's appearance and surface condition are used to establish the suitability of resins in specific environments at the suggested maximum temperatures. Experience and case histories are also duly considered. All of the listed maximum service temperatures assume that laminates and corrosion barriers are fully cured and fabricated to industry accepted standards. In many service conditions, occasional temperature excursions above the listed maxima may be acceptable, depending on the nature of the corrosive environment. Consultation with a Reichhold technical representative is then advised. A Reichhold Technical Representative may be reached via the Reichhold Corrosion Hotline at (800) 752-0060, via email at corrosion@reichhold.com, or at www.reichhold.com/corrosion. All inquiries will be answered within 24 hours. When designing for exposures to hot, relatively non-aggressive vapors, such as in ducting, hoods, or stack linings, temperature extremes above those suggested may be feasible; however, extensive testing is strongly urged whenever suggested temperatures are exceeded. Factors such as laminate thickness, thermal conductivity, structural design performance and the effects of condensation must be taken into account when designing composite products for extreme temperature performance. 1940 -ft