This standard refers to pipes, fittings and joints of PEM and PEH for buried gas pipelines for a maximum working pressure of 0,4 MPa (4 bar) and a maximum temperature of 20 deg. C. The standard specifies requirements for pipes, fittings and welded joints between pipes and between pipes and fittings made in conformity with this standard. The standard also deals with requirements for instructions for use manuals, control and marking.