Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition (ISO 6976:1995 including Corrigendum 1:1997, Corrigendum 2:1997 and Corrigendum 3:1999); German version EN ISO 6976:2005— 69 стр.
Natural gas - Measurement of properties - Volumetric properties: density, pressure, temperature and compression factor (ISO 15970:2008); German version EN ISO 15970:2014— 58 стр.
Gaskets for gas supply - Part 6: Gasket materials based on synthetic fibres, graphite or polytetrafluoroethylen (PTFE) for gas valves, gas appliances and gas mains— 6 стр.