Gas pipes that are used in construction of gas pipelines, made of high-density polyethylene PE80 or PE100 (MRS ≥ 8 MPa i.e. MRS ≥ 10 MPa) of a high quality that guarantees that the pipes will endure the same strain even after 50 years. The production and quality control are in accordance with the national standards. The material is non-toxic and easy for handling and transportation. The pipes are flexible and resistant to vibration, seizmic shocks and shifting of soil. The allowed permanent temperature load is up to +60ºC, whereas temorary allowed load is up to +80ºC. Due to the low friction coefficent, the loss of presure is also low. The pipes are joined (depending on the diameter) using connectors or welding, which can be either electro-fusion or butt welding.