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ECNDT 2006 - Th.1.8.3 Performance of Water-Washable, Fluorescent Penetrants on Water-Basis as Compared to Traditional Water-Washable, Fluorescent Penetrants on Petroleum-Basis Thomas WILLEMS and Christoph KRINGE, Chemetall GmbH, Frankfurt a.M., Germany Abstract. There are mainly economic, environmental and technological reasons that lead to the development of water-based penetrants. The process costs for a water-based penetrant are lower than those for products containing petroleum distillates. Furthermore, water-based penetrants offer the environmental advantages of a low VOC and of readily biodegradable surfactants. Their dilutions fulfil all the requirements of the German regulations of the local waste-water authorities. Part 1 of the report describes the development of a new generation of water-based penetrants. During the formulation of these products, requirements regarding environment, Health Safety, corrosion protection and performance had to be considered. 1.1 Introduction: The new water-based range of three fluorescent penetrants are Level 0.5, 1 and 2 respectively and can be used instead of any water-washable fluorescent penetrant for non- aerospace applications. The series is water-based which means that water represents approximately 50% of the ingredients. By definition, the products are free of any petroleum distillate. 1.2 Technical Challenges to Formulate Water-Based Penetrants: Petroleum distillates have very good characteristics which make them especially appropriate for use in fluorescent penetrants. Their low sur