DIN 3535-6:2011 Gaskets for gas supply - Part 6: Gasket materials based on fibres, graphite or polytetrafluoroethylene (PTFE) for gas valves, gas appliances and gas mains
DIN EN 10083-2:2006 Steels for quenching and tempering - Part 2: Technical delivery conditions for non alloy steels; English version of DIN EN 10083-2:2006-10