black pipe, extruded from high-density polyethylene compound type PE100. The PE100 compound is a homogeneous blend of polyethylene, antioxidants, pigments, and UV-radiation stabilizers. Reference standard: STF13 Valrom Industrie Company Technical Standard. Pipe diameters are standardized and their wall thicknesses comply with STF13. Use: WaterKIT STF13 pipes are used to build drinking water supply networks installed buried in the ground. Important: Cuts or scratches deeper than 10% of the wall thickness are sufficient to deem the pipe unusable and prohibit its use in pressurized applications. Joining STF13 pipes: the pipes are mechanically joined using WaterKIT compression fittings. Given the wall thickness, the pipes are not intended for fusion joining or butt welding. Service life: 50 years corresponds to an operating temperature of 20°C and a working pressure equal to or lower than the PN for which the pipe was manufactured. Approvals: Technical approval and certification for use in construction. Sanitary approval for use with drinking water.