The opportunities of improving the performance of plastics in corrosive applications by knowing better their corrosion properties, and the factors that determine the service lifetime or need for repairs, are discussed. The importance of having relevant design corrosion data is stressed and is exemplified with cases from practice. In particular, the corrosion behavior of FRP in chlorine dioxide, chlorine and sodium chlorate environments is presented. The performance of FRP in flue gas scrubber plants
environments is briefly summarized. Comparisons of the corrosion behavior of metals and plastics are made both from a fundamental point of view considering corrosion mechanisms, types of corrosion, coixosion testing, etc. and from points of view of practical experiences regarding service performance in different applications. Typical reasons for choosing plastics within the process industry are given, as well as typical environments for plastic applications. Keywords: plastics, glass-fiber reinforced plastics, GRP, FRP, corrosion, corrosive environments, corrosion design, corrosion data, chlorine, chlorine dioxide, sodium chlorate, flue gas scrubber plant, process equipment, industrial applications, chemical industry, pulp and paper industry