DIN EN 549:2024-07

This document (EN 549:2019+A1:2023+A2:2024) has been prepared by Technical Committee CEN/TC 208 "Elastomeric seals for joints in pipework and pipelines", the secretariat of which is held by BSI with the active participation of German experts. National interests in its preparation are represented by Working Committee NA 032-03-02 AA "Bauteile und Hilfsstoffe - Gas" ("Components and auxiliary materials - Gas") at DIN Standards Committee Gas Technology (NAGas). This document specifies requirements and associated test methods for rubber materials used in gas installations, gas equipment and gas appliances in contact with 1st, 2nd and 3rd family combustible gases as classified in EN 437:2018, additionally LPG, bio methane and bio LPG, in the same quality, are covered. It also establishes a classification based on temperature range and hardness. This document is applicable to materials from which homogeneous seals and homogeneous or reinforced diaphragms are manufactured. Since the dimensions and shape of the components differ from those of standard test pieces taken from sheet material as used for type testing of the rubber materials according to this document, tolerances have been made in the requirements specified by Annex A for the components with respect to those specified for standard test pieces. The range of operating temperatures covered by this document is - 40 °C to + 150 °C. For applications with potential condensation, this document is not applicable for silicon rubber, for example above 200 hPa (200 mbar) nominal pressure or at temperatures below 0 °C with 3rd family gases. This standard differs from DIN EN 549:2023-07 as follows: a) Annex ZA has been brought in line with Mandate M/595.