PE100 SDR11 pipes (GasKIT) are used in external natural gas distribution networks with maximum operating pressure MOP=10 bar (reference temperature 20°C). The pipes are installed buried underground. The pipes are manufactured from high-density polyethylene type PE100. The raw material is a homogeneous mixture of polyethylene, antioxidants, pigments and UV radiation stabilizers. The pipes are black in color and have longitudinally coextruded yellow stripes. The mean outside diameters, out-of-roundness (ovality) and wall thickness tolerances comply with SR EN 1555-2:2011. The wall thickness and thickness tolerances of the pipes meet the requirements of SR EN 1555-2:2011.