TY - CONF A1 - Häßler, Dustin A1 - Mund, M. A1 - Daus, Lars-Hendrik A1 - Hothan, Sascha A1 - Schaumann, P. A1 - Schartel, Bernhard T1 - Durability of intumescent coatings N2 - For intumescent coatings durability is an important aspect. Due to ageing, which is caused by climatic conditions, the thermal protection performance of intumescent coatings can be reduced during the working life. The national German and the European procedures to assess the durability of intumescent coatings presume a working life of 10 years. For a longer period, additional investigations are required. However, the European assessment procedure does not provide specific information how to prove a durability of more than 10 years. In addition to this formal reason, also from a scientifical position, it is necessary to investigate the degradation of intumescent coatings in detail to propose a corresponding test concept for a durability of more than 10 years. The presentation summarises the existing knowledge about the degradation behaviour and ageing of intumescent coatings. Furthermore, the results of different approaches from a recently conducted research project are presented. Starting from a water-based and an epoxy-based guide formulation, in a first approach a degradation of the intumescent coating was carried out directly during the production process, i.e. by reducing the concentration of functionally relevant chemical components. In another approach, the duration of the short-term weathering tests was significantly extended, i.e. by multiple repetition of the artificial weathering. The thermal protection performance of the intumescent coating was assessed by fire tests and tests with electrical heating source. In addition, small-scale tests were carried out to determine the thermal material properties of the intumescent coating and thermo-analytical methods were applied to characterise the degradation. Derived from this knowledge, possibilities to test and assess a working life for a period of more than 10 years are proposed. T2 - European Conference - Protective & Fire-Retardant Coatings CY - Berlin, Germany DA - 18.10.2023 KW - Intumescent coating KW - Steel KW - Fire protection KW - Durability PY - 2023 AN - OPUS4-58637 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -