The document secifies the properties and the test methods of sealants used to reseal treaded joints of metallic gas pipework in buildings operated at a maximum allowed operating pressure of 100 mbar. It is applicable to sealants for treaded joints of metallic gas pipwork in buildings carrying fuel gases as town gas, natural gas and liquefied petroleum gases, the latter being in the vapour phase only. The sealants specified in this document are suitable for sealing leaky threaded joints, but not corroded or broken pipes.#,,#