The mechanical properties of thermoplastic pipes are of great importance for their possible applications in various branches of industry. ISO 13968 specifies the test methods for determining the ring flexibility of pipes to ensure that the materials can withstand the requirements of bending stresses. According to this standard, the following can be tested with apex pressure testing machines from Hegewald & Peschke.

Hegewald & Peschke offers a special testing system with an incremental displacement sensor for the precise determination of the ring stiffness of plastic pipes in accordance with ISO 9969, which is used, for example, on the inspekt duo universal testing machine.

• Branch: plastics industry

The nominal ring stiffness characterises the strength behaviour of plastic pipes in the construction, electrical and water/waste water industries and is subject to European standards.