Plastic Pipes Conference Association # 2021 Amsterdam
Paul J. Freudenthaler, Joerg Fischer, Mathias Eder, Reinhold W. Lang
For controlled water disinfection, typically chlorine is used and preliminary studies demonstrate its aging and crack growth acceleration effects on polyolefin pipe materials [1, 2]. Although the use of recycled plastics is not prohibited in some ISO standards for polyolefin piping systems [3–5], only small amounts are currently used in the European market. This is most likely a result of lacking experience and confidence in recyclates. The purpose of this paper is to gain an insight in the suitability of commercially available post-consumer recyclates, to be used in compounds, for piping applications. Therefore, fatigue properties of polyethylene (PE) pipe grade material with an enhanced resistance to crack growth (PE100-RC), of an injection-molding pipe grade PE80-IM, of a PE-HD post-consumer waste recyclate and of various compounds of PE100-RC and the PE-HD recyclate were tested in water and chlorinated water with a chlorine content of 5 mg/L. To investigate the temperature influence on the local aging effect of chlorine,superimposed fatigue crack growth (FCG) tests [6] were performed at room temperature and at 60 °C. The recyclate showed a higher dependence on temperature and chlorine content than PE100-RC. When comparing fatigue crack growth resistances, a distinct ranking between the PE compounds is possible. With higher amounts of recyclates in the compound, decreasing fatigue crack growth resistances were found. The 25 % recyclate compound performed better in terms of FCG than the tested PE80-IM grade.
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