Ostendorf Kunststoffe. HT-System PP. Waste pipes and fittings made of Polypropylene (PP). Manufactured according to DIN EN 1451-1 respectively DIN 19560-10, hot water resistant, flame retardant according to DIN 4102-B1. Application: waste pipes for buildings such as waste water, rainwater, and ventilation (see also application areas: DIN 1986-4). Colour: dust grey RAL 7037 cadmium-free. Marking of pipes and fittings: permanent marking with manufacturer label, nominal diameter and standard DIN EN 1451-1 + date of manufacture. Fittings are marked in the same way).