SIST EN 549:2019+A2:2024/oprA3:2025

SLOVENSKI STANDARD
01-julij-2025
Gumeni materiali za tesnila in membrane v plinskih aparatih in plinskih napravah -
Dopolnilo A3
Rubber materials for seals and diaphragms for gas appliances and gas equipment
Elastomer-Werkstoffe für Dichtungen und Membranen in Gasgeräten und Gasanlagen
Matériaux à base de caoutchouc pour joints d'étanchéité et membranes destinés aux
appareils à gaz et matériels pour le gaz
Ta slovenski standard je istoveten z: EN 549:2019+A2:2024/prA3
ICS:
83.140.50 Tesnila Seals
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 549:2019+A2:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA3
April 2025
ICS 23.040.80
English Version
Rubber materials for seals and diaphragms for gas
appliances and gas equipment
Matériaux à base de caoutchouc pour joints Elastomer-Werkstoffe für Dichtungen und Membranen
d'étanchéité et membranes destinés aux appareils à in Gasgeräten und Gasanlagen
gaz et matériels pour le gaz
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 208.

This draft amendment A3, if approved, will modify the European Standard EN 549:2019+A2:2024. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 549:2019+A2:2024/prA3:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to Clause 1, “Scope” . 4
2 Modification to Clause 2, “Normative References” . 4
3 Addition of Annex E “Additional requirements for materials in contact with
Hydrogen” . 4
4 Addition of Annex F “Additional requirements for materials in contact with
(renewable) dimethyl ether” . 7
5 Modifications to the Bibliography . 10

European foreword
This document (EN 549:2019+A2:2024/prA3:2025) 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.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of
EN 549:2019+A2:2024.
1 Modification to Clause 1, “Scope”
Add the following after the first paragraph:
“NOTE Within the energy transition hydrogen (H ) is playing an important role. The gas definition according to
EN 437 does not consider H nor (renewable) Dimethyl ether ((r)DME) within the gas families, yet. Therefore,
the normative scope of this document does not cover H nor (r)DME application.
The informative Annexes E and F specify additional requirements and associated test methods for
rubber materials used in gas installations, gas equipment and gas appliances that are intended to be
used in contact with H or (r)DME.”
2 Modification to Clause 2, “Normative References”
Add the following reference:
“ISO 15105-1:2007, Plastics — Film and sheeting — Determination of gas-transmission rate — Part 1:
Differential-pressure methods”
3 Addition of Annex E “Additional requirements for materials in contact with
Hydrogen”
Add the entire Annex E
Annex E
(informative)
Additional requirements for materials in contact with Hydrogen
E.1 Scope
This annex specifies additional requirements and associated test methods for rubber materials used in
gas installations, gas equipment and gas appliances that are intended to be used in contact with H .
This informative annex describes the requirements, motivation, and tests to characterize elastomer
materials for seals and diaphragms in gas equipment and systems for the use with up to 100 % by
volume H with respect to permeation of H .
2 2
NOTE The revision of EN 437 is in progress, it is intended to define 2nd gas family with a H content up to
20 % by volume H and define the new 4th family for high H content (for example higher than 98 % by volume
2 2
H ).
E.2 General
In general, the material compatibility of elastomer materials with H is given. (For example,
EN ISO 11114-2 incorporates findings on the service life, durability and long-term behaviour of various
families of plastics and elastomers.) The compatibility data contained therein refer to single gases but
can also be used to a certain extent for gas mixtures. This therefore also applies to elastomers tested
according to EN 549 regarding H containing gases.
The method described in this annex leads to an additional material property regarding H
permeability. This technical parameter can be used to compare different materials regarding the
permeation of H . To support the selection of elastomer materials regarding their specific behaviour
for H applications a limit value for H permeation is not specified but a classification is given. The
2 2
technically relevant H permeation on material samples with standardized dimensions is considered.
E.3 Requirements
The additional material property is determined without specifying a limit value. Based on the results
gained in testing according to E.4 materials shall be classified according to H permeability as given in
Table E.1
Table E.1 — hydrogen (H ) permeability classes
Range of permeability
3 2
[(cm mm) / (m 24
...