ISO 18225:2012

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Plastics piping systems — Multilayer piping systems for outdoor gas installations — Specifications for systems

ISO 18225:2012 refers to an international standard that specifies the requirements for "multilayer piping systems" used for outdoor gas supply, particularly focusing on pipes made from thermoplastics and designed to operate within a temperature range of -20°C to 40°C; essentially defining the specifications for these systems used in outdoor gas installations