Tees are made from high-density polyethylene compound, PE100 type, black in colour. PE100 compound is a homogeneous blend of polyethylene, antioxidants, pigments and UV-radiation stabilisers. The PE100 raw material complies with SR ISO 4427-1 and SR EN 12201-1. Manufacturing: injection-moulded fittings. Reference standard SR EN 12201-3: Plastic piping systems for water supply, service connections and pressurised drainage and sewerage systems. Polyethylene (PE). Part 3: Fittings. For use in drinking water supply networks with an operating pressure of PN 16 bar, installed buried in the ground. Service life is 50 years, corresponding to a service temperature of 20°C and a working pressure equal to or lower than the PN for which the fitting was manufactured. Joining method – by butt fusion welding with fittings/pipes of the same SDR. – by electrofusion.