Describes requirements for materials used for moulded seals made of thermoplastic elastomers (TPEs) for joints in thermoplastic piping systems for non-pressure waste water discharge (intermittent flow at up to 95 degrees Celsius) inside buildings, underground drainage and sewerage (continuous flow at up to 45 degrees Celsius and intermittent flow up to 95 degrees Celsius), and thermoplastic rainwater piping systems.