Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 5: Test methods for evaluating plastic liners (ISO 11114-5:2022)

This document specifies the gas compatibility test methods and the evaluation of results from these tests in order to qualify plastic materials suitable for use in the manufacture of composite gas cylinder liners. It may also be used to evaluate the suitability of plastic matrix materials used for Type 5 cylinders

Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in Berührung kommenden Gasen - Teil 5: Prüfverfahren zur Bewertung der Kunststoffinnenbehälter (ISO 11114-5:2022)

Dieses Dokument legt die Prüfverfahren für die Verträglichkeit mit Gasen fest, um für die Herstellung von Linern für Composite-Gasflaschen geeignete Kunststoffe zu bewerten. Es darf darüber hinaus angewendet werden, um die Eignung von Matrix-Werkstoffen aus Kunststoff, die für Flaschen Typ 5 verwendet werden, zu bewerten.
Einige Flüssigkeiten, wie etwa Wasser, die zur Prüfung von Flaschen verwendet werden, können positiv oder negativ reagieren, wenn sie Kontakt mit Kunststoff-Linern haben. Dieses Verträglichkeitsproblem wird von diesem Dokument nicht erfasst.

Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les contenus gazeux - Partie 5: Méthodes d’essai pour l’évaluation des liners en plastique (ISO 11114-5:2022))

Le présent document spécifie des méthodes d’essai de la compatibilité des gaz pour évaluer les matières plastiques convenant à la fabrication des liners des bouteilles à gaz composites. Il s’applique également à l’évaluation de l’adéquation des matières plastiques de la matrice utilisée pour les bouteilles de Type 5.
Certains liquides comme l’eau, utilisés pour soumettre à essai des bouteilles, peuvent réagir positivement ou négativement lorsqu’ils sont en contact avec des liners en plastique. Ce problème de compatibilité n’est pas couvert par le présent document.

Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 5. del: Preskusne metode za vrednotenje plastičnih notranjih prevlek (ISO 11114-5:2022)

General Information

Status
Published
Public Enquiry End Date
28-Feb-2021
Publication Date
23-Jun-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Apr-2022
Due Date
26-Jun-2022
Completion Date
24-Jun-2022

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SLOVENSKI STANDARD
SIST EN ISO 11114-5:2022
01-september-2022

Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 5. del:

Preskusne metode za vrednotenje plastičnih notranjih prevlek (ISO 11114-5:2022)

Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 5:

Test methods for evaluating plastic liners (ISO 11114-5:2022)

Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in

Berührung kommenden Gasen - Teil 5: Prüfverfahren zur Bewertung der
Kunststoffinnenbehälter (ISO 11114-5:2022)

Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les

contenus gazeux - Partie 5: Méthodes d’essai pour l’évaluation des liners en plastique

(ISO 11114-5:2022))
Ta slovenski standard je istoveten z: EN ISO 11114-5:2022
ICS:
23.020.35 Plinske jeklenke Gas cylinders
SIST EN ISO 11114-5:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 11114-5:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 11114-5:2022
EN ISO 11114-5
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2022
EUROPÄISCHE NORM
ICS 23.020.35
English Version
Gas cylinders - Compatibility of cylinder and valve
materials with gas contents - Part 5: Test methods for
evaluating plastic liners (ISO 11114-5:2022)

Bouteilles à gaz - Compatibilité des matériaux des Gasflaschen - Verträglichkeit von Werkstoffen für

bouteilles et des robinets avec les contenus gazeux - Gasflaschen und Ventile mit den in Berührung

Partie 5: Méthodes d'essai pour l'évaluation des liners kommenden Gasen - Teil 5: Prüfverfahren zur

en plastique (ISO 11114-5:2022) Bewertung der Kunststoffinnenbehälter (ISO 11114-

5:2022)
This European Standard was approved by CEN on 26 December 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists 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, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11114-5:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11114-5:2022
EN ISO 11114-5:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 11114-5:2022
EN ISO 11114-5:2022 (E)
European foreword

This document (EN ISO 11114-5:2022) has been prepared by Technical Committee ISO/TC 58 "Gas

cylinders" in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the

secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by July 2022, and conflicting national standards shall be

withdrawn at the latest by July 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: 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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 11114-5:2022 has been approved by CEN as EN ISO 11114-5:2022 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 11114-5:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 11114-5:2022
INTERNATIONAL ISO
STANDARD 11114-5
First edition
2022-01
Gas cylinders — Compatibility of
cylinder and valve materials with gas
contents —
Part 5:
Test methods for evaluating plastic
liners
Bouteilles à gaz — Compatibilité des matériaux des bouteilles et des
robinets avec les contenus gazeux —
Partie 5: Méthodes d’essai pour l’évaluation des liners en plastique
Reference number
ISO 11114-5:2022(E)
© ISO 2022
---------------------- Page: 7 ----------------------
SIST EN ISO 11114-5:2022
ISO 11114-5:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 11114-5:2022
ISO 11114-5:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 General requirements .................................................................................................................................................................................... 2

5 Tests to be performed on specimens ............................................................................................................................................. 2

5.1 Permeation test ...................................................................................................................................................................................... 2

5.1.1 Disc samples ........................................................................................................................................................................... 2

5.1.2 Test bench and set-up ..................................................................................................................................................... 3

5.1.3 Procedure ................................................................................................................................................................................. 5

5.1.4 Calculation of the permeability coefficient................................................................................................. 6

5.1.5 Recording and interpretation of test results ............................................................................................ 6

5.2 Swelling/blistering test .................................................................................................................................................................. 7

5.2.1 Disc samples ........................................................................................................................................................................... 7

5.2.2 Recording and interpretation of tests results ......................................................................................... 7

5.3 Ageing test .................................................................................................................................................................................................. 8

5.3.1 Samples ....................................................................................................................................................................................... 8

5.3.2 Procedure ................................................................................................................................................................................. 8

5.3.3 Recording and interpretation of the results .............................................................................................. 8

6 Tests to be performed on cylinders .................................................................................................................................................9

6.1 Liner collapse due to internal pressure in the cylinder being below atmospheric

pressure ........................................................................................................................................................................................................ 9

6.1.1 General ........................................................................................................................................................................................ 9

6.1.2 Procedure ................................................................................................................................................................................. 9

6.1.3 Evaluation parameters ................................................................................................................................................. 9

6.2 Permeability test .................................................................................................................................................................................. 9

6.2.1 General ........................................................................................................................................................................................ 9

6.2.2 Procedure ................................................................................................................................................................................. 9

6.2.3 Evaluation parameters .............................................................................................................................................. 10

6.3 Liner collapse and blistering test ........................................................................................................................................ 10

6.3.1 General ..................................................................................................................................................................................... 10

6.3.2 Procedure .............................................................................................................................................................................. 10

6.3.3 Evaluation parameters .............................................................................................................................................. 10

7 Rejection and rendering cylinders used for testing unserviceable ...........................................................12

8 Test report ...............................................................................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................14

iii
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 11114-5:2022
ISO 11114-5:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, in collaboration with

the European Committee for Standardization (CEN) Technical Committee CEN/TC 23, Transportable gas

cylinders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna

Agreement).
A list of all parts in the ISO 11114 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 11114-5:2022
ISO 11114-5:2022(E)
Introduction

Non-metallic materials are used for the manufacturing of liners of some composite gas cylinders and

therefore are in contact with gas contents.

The compatibility of plastic liners with gas cylinder contents is a key parameter for the manufacturing

of composite gas cylinders with plastic liners. Therefore, it is necessary to clarify such compatibility

and to give test procedures and evaluation parameters.

This document provides some testing methodologies to evaluate suitability of plastic materials

concerning the risks identified in ISO 11114-2. Furthermore, this document is intended to be used

together with the design standard (e.g. ISO 11515, EN 12245) which gives the requirements for certain

tests, as well as the criteria, while this document describes the test procedure.

© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 11114-5:2022
---------------------- Page: 12 ----------------------
SIST EN ISO 11114-5:2022
INTERNATIONAL STANDARD ISO 11114-5:2022(E)
Gas cylinders — Compatibility of cylinder and valve
materials with gas contents —
Part 5:
Test methods for evaluating plastic liners
1 Scope

This document specifies some gas compatibility test methods to evaluate plastic materials suitable for

use in the manufacture of composite gas cylinder liners. It is also applicable to the evaluation of the

suitability of plastic matrix materials used for Type 5 cylinders.

Some fluids like water, used for cylinders testing, can react positively or negatively when in contact

with plastic liners. This compatibility issue is not covered by this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 178, Plastics — Determination of flexural properties

ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test

ISO 527 (all parts), Plastics — Determination of tensile properties
ISO 3167, Plastics — Multipurpose test specimens
ISO 8256, Plastics — Determination of tensile-impact strength
ISO 10286, Gas cylinders — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 10286 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
blister

localized delamination or void within the liner material that looks like a bubble

3.2
maximum permissible filling mass
maximum mass of gas in kg which is allowed in a filled cylinder
Note 1 to entry: This term applies to liquefied gas.
[SOURCE: ISO 24431:2016, 3.13]
© ISO 2022 – All rights reserved
---------------------- Page: 13 ----------------------
SIST EN ISO 11114-5:2022
ISO 11114-5:2022(E)
3.3
Type 5 cylinder

fully wrapped cylinder without a liner and with composite reinforcement on both the cylindrical

portion and dome ends
4 General requirements

This document is designed to determine the suitability of the materials with regard to the risks

identified in ISO 11114-2 and to evaluate materials not listed in ISO 11114-2.
Two types of tests can be performed:
a) tests on discs or other specimens (see Clause 5);
b) tests on cylinders (see Clause 6).

To determine the suitability of materials for a given liner, testing shall be performed on cylinders in

accordance with Clause 6.

The tests on specimens should only be performed to compare different plastic materials (e.g. to select

the most suitable material) or to check if some zones on the liner permeate more than others, or both.

Tests on disc or specimen are difficult in case of Type 5 cylinders. Therefore, tests on cylinders are

recommended.

Some substances (e.g. moisture, sulfur compounds) can have a positive or negative effect on the

material performance, and this shall be taken into account when designing and carrying out tests.

These substances can be present in the gas or released by the plastic materials, or both.

Analysis of test gas shall be recorded to identify any possible contamination (e.g. moisture, sulfur

compounds, etc.) both prior to and after the test.
5 Tests to be performed on specimens
5.1 Permeation test
5.1.1 Disc samples

The disc samples shall be taken either from a liner or using samples manufactured according to the

intended process, such as injection moulding or blow moulding (e.g. to select the most suitable material).

NOTE 1 Treatments such as curing can affect the properties of the liner materials.

It is recommended that all process steps that influence the behaviour of the liner material that are

applied to the finished cylinder, including thermal treatment, are applied to the sp

...

SLOVENSKI STANDARD
oSIST prEN ISO 11114-5:2021
01-februar-2021

Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 5. del:

Preskusne metode za vrednotenje plastičnih notranjih prevlek (ISO/DIS 11114-
5:2020)

Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 5:

Test methods for evaluating plastic liners (ISO/DIS 11114-5:2020)

Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in

Berührung kommenden Gasen - Teil 5: Prüfverfahren zur Bewertung der
Kunststoffinnenbehälter (ISO/DIS 11114-5:2020)

Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les

contenus gazeux - Partie 5: Méthodes d’essai pour l’évaluation des liners en plastique

(ISO/DIS 11114-5:2020)
Ta slovenski standard je istoveten z: prEN ISO 11114-5
ICS:
23.020.35 Plinske jeklenke Gas cylinders
oSIST prEN ISO 11114-5:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 11114-5:2021
---------------------- Page: 2 ----------------------
oSIST prEN ISO 11114-5:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11114-5
ISO/TC 58 Secretariat: BSI
Voting begins on: Voting terminates on:
2020-12-09 2021-03-03
Gas cylinders — Compatibility of cylinder and valve
materials with gas contents —
Part 5:
Test methods for evaluating plastic liners
ICS: 23.020.35
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11114-5:2020(E)
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. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 11114-5:2021
ISO/DIS 11114-5:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 11114-5:2021
ISO/DIS 11114-5:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 1

5 Tests to be performed on specimen.................................................................................................................................................. 2

5.1 Permeation test ...................................................................................................................................................................................... 2

5.1.1 Disc samples ........................................................................................................................................................................ 2

5.1.2 Test bench & set-up ....................................................................................................................................................... 2

5.1.3 Procedure ............................................................................................................................................................................... 4

5.1.4 Calculation of the permeability coefficient ............................................................................................... 5

5.1.5 Recording and interpretation of test results ........................................................................................... 5

5.2 Swelling/Blistering test ................................................................................................................................................................... 6

5.2.1 Disc samples ........................................................................................................................................................................ 6

5.2.2 Recording and interpretation of tests results ......................................................................................... 6

5.3 Ageing test .................................................................................................................................................................................................. 6

5.3.1 Samples .................................................................................................................................................................................... 6

5.3.2 Procedure ............................................................................................................................................................................... 7

5.3.3 Recording and interpretation of the results ............................................................................................. 7

6 Tests to be performed on cylinders .................................................................................................................................................. 8

6.1 Liner collapse due to internal pressure in the cylinder below atmospheric pressure ............. 8

6.1.1 General...................................................................................................................................................................................... 8

6.1.2 Procedure ............................................................................................................................................................................... 8

6.1.3 Evalu ation parameters................................................................................................................................................ 8

6.2 Permeability test ................................................................................................................................................................................... 8

6.2.1 General...................................................................................................................................................................................... 8

6.2.2 Procedure ............................................................................................................................................................................... 8

6.2.3 Evalu ation parameters................................................................................................................................................ 9

6.3 Liner collapse and blistering test ............................................................................................................................................ 9

6.3.1 General...................................................................................................................................................................................... 9

6.3.2 Procedure ............................................................................................................................................................................... 9

6.3.3 Evalu ation parameters................................................................................................................................................ 9

7 Rejection and rendering cylinders used for testing unserviceable ..............................................................11

8 Test report ................................................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 11114-5:2021
ISO/DIS 11114-5:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders.
A list of all parts in the ISO 11114 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 11114-5:2021
ISO/DIS 11114-5:2020(E)
Introduction

Non-metallic materials are used for the manufacturing of liners of some composite gas cylinders and

therefore are in contact with gas contents.

The compatibility of plastic liners with gas cylinder contents is a key parameter for the manufacturing

of composite gas cylinders with plastic liners. Therefore, it is necessary to clarify such compatibility

and to give test procedures and evaluation parameters. This part of ISO 11114 has been prepared for

this purpose.

This document provides testing methodologies to evaluate suitability of plastic materials concerning

the risks identified in ISO 11114-2. Furthermore, this document is intended to be used together with

the design standard which gives the requirements for certain tests, as well as the criteria, while this

document describes the test procedure.
© ISO 2020 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 11114-5:2021
---------------------- Page: 8 ----------------------
oSIST prEN ISO 11114-5:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 11114-5:2020(E)
Gas cylinders — Compatibility of cylinder and valve
materials with gas contents —
Part 5:
Test methods for evaluating plastic liners
1 Scope

This document specifies the gas compatibility test methods in order to evaluate plastic materials

suitable for use in the manufacture of composite gas cylinder liners. It may also be used to evaluate the

suitability of plastic matrix materials used for Type 5 cylinders.

Some fluids like water, used for cylinders testing, may react positively or negatively when in contact

with plastic liners. This compatibility issue is not covers by this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 10286, Gas cylinders — Terminology
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 10286 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
blister

localized delamination or void within the liner material that looks like a bubble

4 General requirements

This standard is used to determine the suitability of the materials with regard to the risks identified in

ISO 11114-2 and to evaluate materials not listed in ISO 11114-2.
Two types of tests can be performed:
a) Tests on disc or other specimen (Clause 5);
b) Tests on cylinders (Clause 6).

To determine the suitability of materials for a given liner, testing shall be performed on cylinders in

accordance with Clause 6.

The tests on specimens should only be performed to compare different plastic materials (e.g. to select

the most suitable material) and/or to check if some zones on the liner permeates more than other.

© ISO 2020 – All rights reserved 1
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oSIST prEN ISO 11114-5:2021
ISO/DIS 11114-5:2020(E)

Tests on disc or specimen are difficult in case of type 5 cylinders. Therefore, tests on cylinders are

recommended.

Some substances (e.g. moisture, sulphur compounds …), may have a positive or negative effect on the

material performance and this shall be taken into account when designing and carrying out tests. These

substances can be present in the gas and/or released by the plastic materials.

Analysis of test gas shall be recorded to identify any possible contamination (e.g. moisture, sulphur

compounds …) both prior to and after the test.
5 Tests to be performed on specimen
5.1 Permeation test
5.1.1 Disc samples

The disc samples shall be taken either from a liner or using samples manufactured according to the

intended process such as injection molding, or blow molding (e.g. to select the most suitable material).

NOTE Treatments such as curing may affect the properties of the liner materials.

It is recommended that all process steps that influence the behaviour of the liner material, including

thermal treatment, that are applied to the finished cylinder are applied to the specimens.

In case of comparison between two or more materials, it is recommended that samples are manufactured

using the same process. Preferably, the process should match the intended liner manufacturing process.

It is also possible to check which process is the most appropriate liner manufacturing process.

An external diameter of the test specimen disk between 40 mm and 80 mm is typically recommended.

The thickness of the sample may vary depending on the thickness of the liner and the pressure to be

applied during the test.

The dimensions (including thickness) and sample preparation, the manufacturing process and the

location of the disc shall be recorded.

NOTE If sample preparation includes machining, this will affect the permeation due to the non-homogeneity

of the sample.

The moisture content and outgassing of the test specimen can affect measurement results of the disc

sample permeation test. It is recommended to dehumidify and outgas the test specimen, for example,

heating to 65°C under vacuum (~10-50 mbar) until < 0.1 % mass loss over a period of 24 hours is

observed.
5.1.2 Test bench & set-up

The test cell concept is shown in Figures 1 and 2 which allows pressurization of one side of the test

sample and support of the low-pressure side while allowing the permeated test gas to flow through and

exit to the detector. Detection and measurement of the permeated gas may be accomplished by several

methods, some of which are but not limited to:
— Measurement by permeated volume (e.g. using a pipette);
— Measurement by mass spectroscopy;
— Measurement by gas concentration in a fixed volume (ppm);
— Measurement by pressure rise in a fixed volume;
or by any other equi
...

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