PE100 SDR11 (GasKIT) pipes are used in outdoor natural gas transmission networks, with a maximum operating pressure MOP=10 bar (reference temperature 20°C). The pipes are installed buried in the ground. The pipes are made of high-density polyethylene, PE100 type. The raw material is a homogeneous blend of polyethylene, antioxidants, pigments, and UV stabilizers. The pipes are black and have yellow longitudinal co-extruded stripes. The average outside diameters, deviation from circularity (ovality), and pipe tolerances comply with SR EN 1555-2:2011. The wall thickness and wall thickness tolerances comply with the requirements of SR EN 1555-2:2011.