SIST EN ISO 12629:2022

Thermal insulating products for building equipment and industrial installations - Determination of water vapour transmission properties of preformed pipe insulation (ISO 12629:2022)

This European Standard specifies the equipment and procedure for determining the water vapour transmission properties in the steady state under specified test conditions for test specimens of preformed pipe insulation. It is applicable to thermal insulating products.
It is intended to be used for homogeneous materials (see NOTE) and for products which may have integral skins or adhered facings of some different material.
NOTE   A material is considered to be homogeneous in terms of mass distribution if its density is approximately the same throughout, i.e. if the measured density values are close to its mean density.
The water vapour transmission rate and permeance values are specific to the test specimen (i.e. the product) thickness tested. For homogeneous products, the water vapour permeability is a property of the material.
If the pipe insulation is cut from a flat product, then the water vapour transmission properties can be obtained from tests carried out on the flat product with similar properties in accordance with EN 12086.

Wärmedämmstoffe für die Haustechnik und für betriebstechnische Anlagen - Bestimmung der Wasserdampfdurchlässigkeit von vorgeformten Rohrdämmstoffen (ISO 12629:2022)

Diese Internationale Norm legt Prüfeinrichtungen und Verfahren zur Bestimmung der Wasserdampf-durchlässigkeits-Eigenschaften von Probekörpern aus vorgeformten Rohrdämmstoffen im stationären Zustand unter definierten Prüfbedingungen fest. Sie gilt für Wärmedämmprodukte.
Sie ist dafür vorgesehen, bei homogenen Dämmstoffen (siehe folgende Anmerkung) und bei Produkten, die bestimmte Oberflächenschichten oder Kaschierungen aus anderen Werkstoffen enthalten können, angewendet zu werden.
ANMERKUNG Ein Dämmstoff wird hinsichtlich seiner Massenverteilung als homogen angesehen, wenn seine Dichte überall etwa gleich ist, das heißt, wenn die gemessenen Werte nahe beim Mittelwert seiner Dichte liegen.
Die Wasserdampf-Diffusionsstromdichte und der Wasserdampf-Diffusionsdurchlasskoeffizient sind abhängig von der Dicke des geprüften Probekörpers bzw. des geprüften Produkts. Für homogene Produkte ist der Wasserdampf-Diffusionsleitkoeffizient eine Stoffeigenschaft.
Ist die Rohrschale aus einem ebenen Produkt herausgeschnitten worden, können die Wasserdampf-durchlässigkeits-Eigenschaften aus Prüfungen bestimmt werden, die nach ISO 12572 an dem ebenen Produkt mit ähnlichen Eigenschaften durchgeführt wurden.

Produits isolants thermiques pour les équipements des bâtiments et les installations industrielles - Détermination des propriétés de transmission de la vapeur d'eau des coquilles isolantes préformées (ISO 12629:2022)

Le présent document spécifie les équipements nécessaires et les modes opératoires à suivre pour déterminer, à l’équilibre et dans des conditions d’essai spécifiées, les propriétés de transmission de la vapeur d’eau d’éprouvettes constituées de coquilles isolantes préformées. Il s’applique aux produits isolants thermiques.
Il est destiné aux matériaux homogènes (voir NOTE ci-dessous) et aux produits qui peuvent posséder des revêtements intégrés ou des parements collés faits d’un autre matériau.
NOTE         Un matériau est estimé homogène quant à sa distribution massique si sa masse volumique est à peu près la même partout, c’est-à-dire si les valeurs mesurées de la masse volumique sont proches de sa masse volumique moyenne.

Toplotnoizolacijski proizvodi za opremo stavb in industrijske inštalacije - Ugotavljanje lastnosti prenosa vodne pare predoblikovanih cevnih izolacij (ISO 12629:2022)

Ta evropski standard določa opremo in postopek za ugotavljanje lastnosti prenosa vodne pare v stacionarnem stanju pod določenimi preskusnimi pogoji za preskusne vzorce predoblikovanih cevnih izolacij. Uporablja se za toplotnoizolacijske proizvode.
Namenjen je za uporabo za homogene materiale (glej OPOMBO) in za proizvode, ki lahko imajo vdelane prevleke ali dodane sloje iz različnih materialov.
OPOMBA:   Material je v smislu porazdelitve mase homogen takrat, ko je njegova gostota v celoti približno enaka, tj. če so izmerjene vrednosti gostote blizu njegovi povprečni gostoti.
Vrednosti stopnje prenosa vodne pare in prepustnosti so specifične za debelino preskušancev (tj. proizvod). Za homogene proizvode je prepustnost vodne pare lastnost materiala.
Če je cevna izolacija izrezana iz ploščatega proizvoda, je mogoče lastnosti prenosa vodne pare pridobiti s preskusi, izvedenimi na ploščatem proizvodu s podobnimi lastnostmi v skladu s standardom EN 12086.

General Information

• Status: Published
• Public Enquiry End Date: 15-Jul-2021
• Publication Date: 10-Oct-2022
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: TOP - Thermal insulation
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Sep-2022
• Due Date: 01-Dec-2022
• Completion Date: 11-Oct-2022
• Ref Project: EN ISO 12629:2022 - Thermal insulating products for building equipment and industrial installations - Determination of water vapour transmission properties of preformed pipe insulation (ISO 12629:2022)

Relations

• Replaces: SIST EN 13469:2013 - Thermal insulating products for building equipment and industrial installations - Determination of water vapour transmission properties of preformed pipe insulation
• Effective Date: 01-Nov-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 12629:2022
01-november-2022
Nadomešča:
SIST EN 13469:2013
Toplotnoizolacijski proizvodi za opremo stavb in industrijske inštalacije -
Ugotavljanje lastnosti prenosa vodne pare predoblikovanih cevnih izolacij (ISO
12629:2022)
Thermal insulating products for building equipment and industrial installations -
Determination of water vapour transmission properties of preformed pipe insulation (ISO
12629:2022)
Wärmedämmstoffe für die Haustechnik und für betriebstechnische Anlagen -
Bestimmung der Wasserdampfdurchlässigkeit von vorgeformten Rohrdämmstoffen (ISO
12629:2022)
Produits isolants thermiques pour les équipements des bâtiments et les installations
industrielles - Détermination des propriétés de transmission de la vapeur d'eau des
coquilles isolantes préformées (ISO 12629:2022)
Ta slovenski standard je istoveten z: EN ISO 12629:2022
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
SIST EN ISO 12629:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12629:2022

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SIST EN ISO 12629:2022


EN ISO 12629
EUROPEAN STANDARD

NORME EUROPÉENNE

September 2022
EUROPÄISCHE NORM
ICS 91.100.60 Supersedes EN 13469:2012
English Version

Thermal insulating products for building equipment and
industrial installations - Determination of water vapour
transmission properties of preformed pipe insulation (ISO
12629:2022)
Produits isolants thermiques pour les équipements de Wärmedämmstoffe für die Haustechnik und für
bâtiments et les installations industrielles - betriebstechnische Anlagen - Bestimmung der
Détermination des propriétés de transmission de la Wasserdampfdurchlässigkeit von vorgeformten
vapeur d'eau des coquilles isolantes préformées (ISO Rohrdämmstoffen (ISO 12629:2022)
12629:2022)
This European Standard was approved by CEN on 7 August 2022.

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, Türkiye 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 12629:2022 E
worldwide for CEN national Members.

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SIST EN ISO 12629:2022
EN ISO 12629:2022 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 12629:2022
EN ISO 12629:2022 (E)
European foreword
This document (EN ISO 12629:2022) has been prepared by Technical Committee ISO/TC 163/SC 1
"Test and measurement methods" in collaboration with Technical Committee CEN/TC 88 “Thermal
insulating materials and products” the secretariat of which is held by DIN.
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 March 2023, and conflicting national standards shall
be withdrawn at the latest by September 2025.
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.
This document supersedes EN 13469:2012.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12629:2022 has been approved by CEN as EN ISO 12629:2022 without any modification.


3

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SIST EN ISO 12629:2022

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SIST EN ISO 12629:2022
INTERNATIONAL ISO
STANDARD 12629
Second edition
2022-08
Thermal insulating products for
building equipment and industrial
installations — Determination of
water vapour transmission properties
of preformed pipe insulation
Produits isolants thermiques pour les équipements de bâtiments et
les installations industrielles — Détermination des propriétés de
transmission de la vapeur d’eau des coquilles isolantes préformées
Reference number
ISO 12629:2022(E)
© ISO 2022

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SIST EN ISO 12629:2022
ISO 12629:2022(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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2022 – All rights reserved

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SIST EN ISO 12629:2022
ISO 12629:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols, units and subscripts . 1
3.1 Terms and definitions . 1
3.2 Symbols and units . 2
3.3 Subscripts . 3
4 Principle . 3
5 Apparatus . 3
6 Test specimens . 4
6.1 General . 4
6.2 Dimensions of the test specimen . 4
6.3 Number of test specimens . 4
6.4 Conditioning of test specimens . 4
7 Procedure .5
7.1 Test conditions . 5
7.2 Preparation of specimen and test assembly . 6
7.3 Test procedure . 6
8 Calculation and expression of results . 7
8.1 Water vapour flow rate . 7
8.2 Density of water vapour flow rate . 8
8.3 Water vapour permeance. 8
8.4 Water vapour resistance. 8
8.5 Water vapour permeability . 9
8.6 Water vapour diffusion resistance factor . 9
8.6.1 General . 9
8.6.2 Calculation of δ . 10
a
8.6.3 Calculation of δ . 11
8.6.4 Calculation of μ .12
9 Accuracy of measurement.12
10 Test report .12
Bibliography .14
iii
© ISO 2022 – All rights reserved

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SIST EN ISO 12629:2022
ISO 12629:2022(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 163, Thermal performance and energy use
in the built environment, Subcommittee SC 1, Test and measurement methods, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 88, Thermal insulating
materials and products, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12629:2011), which has been technically
revised.
The main changes are as follows:
— EN 13469:2012 and ISO 12629:2011 have been merged into one document;
— technical revision of Clause 3, Terms, definitions, symbols and subscripts, 6.3, Number of test
specimens, Clause 7, Procedure and Clause 8, Calculation and expression of results;
— Annex A has been deleted;
— editorial revisions.
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 2022 – All rights reserved

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SIST EN ISO 12629:2022
INTERNATIONAL STANDARD ISO 12629:2022(E)
Thermal insulating products for building equipment and
industrial installations — Determination of water vapour
transmission properties of preformed pipe insulation
1 Scope
This document specifies the equipment and procedure for determining the water vapour transmission
properties in the steady state under specified test conditions for test specimens of preformed pipe
insulation. It is applicable to thermal insulating products.
It is intended to be used for homogeneous materials (see NOTE below) and for products which can have
integral skins or adhered facings of some different material.
NOTE A material is considered to be homogeneous in terms of mass distribution if its density is approximately
the same throughout, i.e. if the measured density values are close to its mean density.
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 9346, Hygrothermal performance of buildings and building materials — Physical quantities for mass
transfer — Vocabulary
ISO 12628, Thermal insulating products for building equipment and industrial installations —
Determination of dimensions, squareness and linearity of preformed pipe insulation
ISO 29768, Thermal insulating products for building applications — Determination of linear dimensions of
test specimens
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9346 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/
3.1.1
water vapour flow rate
G
quantity of water vapour transmitted through the surface of the test specimen in mass divided by time
3.1.2
density of water vapour flow rate
g
mass of water vapour transferred through the specimen per area and per time under specified
conditions of temperature, humidity and thickness
1
© ISO 2022 – All rights reserved

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SIST EN ISO 12629:2022
ISO 12629:2022(E)
3.1.3
water vapour permeance
W
quotient of water vapour transmission rate of the test specimen and the water vapour pressure
difference per area between the test specimen faces during the test
3.1.4
water vapour resistance
Z
inverse of water vapour permeance (3.1.3) (1/W)
3.1.5
water vapour permeability
δ
product of the permeance and the thickness of the test specimen (δ = W · d)
Note 1 to entry: The water vapour permeability of a homogeneous product is a property of the material. It is
the quantity of water vapour transmitted per unit of time through a unit area of the product per unit of vapour
pressure difference between its faces for a unit thickness.
3.1.6
water vapou
...

SLOVENSKI STANDARD
oSIST prEN ISO 12629:2021
01-julij-2021
Toplotnoizolacijski proizvodi za opremo stavb in industrijske inštalacije -
Ugotavljanje lastnosti prenosa vodne pare predoblikovanih cevnih izolacij
(ISO/DIS 12629:2021)
Thermal insulating products for building equipment and industrial installations -
Determination of water vapour transmission properties of preformed pipe insulation
(ISO/DIS 12629:2021)
Wärmedämmstoffe für die Haustechnik und für betriebstechnische Anlagen -
Bestimmung der Wasserdampfdurchlässigkeit von vorgeformten Rohrdämmstoffen
(ISO/DIS 12629:2021)
Produits isolants thermiques pour les équipements des bâtiments et les installations
industrielles - Détermination des propriétés de transmission de la vapeur d'eau des
coquilles isolantes préformées (ISO/DIS 12629:2021)
Ta slovenski standard je istoveten z: prEN ISO 12629
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
oSIST prEN ISO 12629:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 12629:2021

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oSIST prEN ISO 12629:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12629
ISO/TC 163/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-05-13 2021-08-05
Thermal insulating products for building equipment and
industrial installations — Determination of water vapour
transmission properties of preformed pipe insulation
Produits isolants thermiques pour les équipements des bâtiments et les installations industrielles —
Détermination des propriétés de transmission de la vapeur d'eau des coquilles isolantes préformées
ICS: 91.100.60
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 12629:2021(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 2021

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oSIST prEN ISO 12629:2021
EN ISO 12629:2021(X)
ISO/DIS 12629:2021(E)

Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols, units and subscripts . 1
3.1 Terms and definitions . 1
3.2 Symbols and units . 2
3.3 Subscripts . 3
4 Principle . 3
5 Apparatus . 4
6 Test specimens. 4
6.1 General . 4
6.2 Dimensions of the test specimen . 4
6.3 Number of test specimens. 5
6.4 Conditioning of test specimens . 5
7 Procedure . 5
7.1 Test conditions . 5
7.2 Preparation of specimen and test assembly . 7
7.3 Test procedure . 7
8 Calculation and expression of results. 8
8.1 Water vapour flow rate . 8
8.2 Water vapour transmission rate . 9
8.3 Water vapour permeance . 9
8.4 Water vapour resistance . 10
8.5 Water vapour permeability . 10
8.6 Water vapour diffusion resistance factor . 10
8.6.1 General . 10
8.6.2 Calculation of δ . 11
a
8.6.3 Calculation of δ . 11
8.6.4 Calculation of µ . 13
9 Accuracy of measurement . 13
10 Test report . 13
Bibliography . 15

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved iii
ii © ISO 2021 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
Contents
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols, units and subscripts . 1
3.1 Terms and definitions . 1
3.2 Symbols and units . 2
3.3 Subscripts . 3
4 Principle . 3
5 Apparatus . 4
6 Test specimens. 4
6.1 General . 4
6.2 Dimensions of the test specimen . 4
6.3 Number of test specimens. 5
6.4 Conditioning of test specimens . 5
7 Procedure . 5
7.1 Test conditions . 5
7.2 Preparation of specimen and test assembly . 7
7.3 Test procedure . 7
8 Calculation and expression of results . 8
8.1 Water vapour flow rate . 8
8.2 Water vapour transmission rate . 9
8.3 Water vapour permeance . 9
8.4 Water vapour resistance . 10
8.5 Water vapour permeability . 10
8.6 Water vapour diffusion resistance factor . 10
8.6.1 General . 10
8.6.2 Calculation of δ . 11
a
8.6.3 Calculation of δ . 11
8.6.4 Calculation of µ . 13
9 Accuracy of measurement . 13
10 Test report . 13
Bibliography . 15

© ISO 2021 – All rights reserved iii

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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(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 the European Committee of Standardization (CEN) Technical Committee
CEN/TC 88, Thermal insulating materials and products, in collaboration with ISO Technical Committee
ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 1, Test and
measurement methods, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12629:2011), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— combination of EN 13469:2012 and ISO 12629:2011 in one document;
— technical revision of clause 3, Terms, definitions, symbols and subscripts, clause 6.3, Number of test
specimens, clause 7, Procedure and clause 8, Calculation and expression of results;
— Annex A was deleted;
— editorial revision.
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.
This International Standard is one of a series of standards which specify test methods for determining
dimensions and properties of thermal insulating materials and products. The original EN 13469 supports
a series of product standards for thermal insulating materials and products which derive from the Council
Directive of 21 December 1988 on the approximation of laws, regulations and administrative provisions
iv © ISO 2021 – All rights reserved

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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
of the Member States relating to constructive products (Directive 89/106/EEC) through the
consideration of the essential requirements.
This International Standard is one of a series of existing European Standards on test methods for products
used to insulate building equipment and industrial installations which is comprised of the following
group of International Standards:
Respective
ISO standard Title
EN standard
ISO 12623 Thermal insulating products for building equipment and industrial EN 13472:2012
installations — Determination of short-term water absorption by
partial immersion of preformed pipe insulation
ISO 12624 Thermal insulation products — Determination of trace quantities of EN 13468:2001
water soluble chloride, fluoride, silicate, sodium ions and pH
ISO 12628 Thermal insulating products for building equipment and industrial EN 13467:2018
installations — Determination of dimensions, squareness and linearity
of preformed pipe insulation
ISO 12629 Thermal insulating products for building equipment and industrial EN 13469:2012
installations — Determination of water vapour transmission properties
of preformed pipe insulation
ISO 18096 Thermal insulating products for building equipment and industrial EN 14707:2012
installations — Determination of maximum service temperature for
preformed pipe insulation
ISO 18097 Thermal insulating products for building equipment and industrial EN 14706:2012
installations — Determination of maximum service temperature
ISO 18098 Thermal insulating products for building equipment and industrial EN 13470:2001
installations — Determination of the apparent density of preformed
pipe insulation
ISO 18099 Thermal insulating products for building equipment and industrial EN 13471:2001
installations — Determination of the coefficient of thermal expansion

A further series of existing European Standards on test methods was adopted by ISO. This “package” of
standards comprises the following group of interrelated standards:
Respective
ISO standard Title
EN standard
ISO 12344 Thermal insulating products for building applications — Determination EN 12089
of bending behaviour
ISO 12968 Thermal insulation products for building applications — Determination EN 13495
of the pull-off resistance of external thermal insulation composite

systems (ETICS) (foam block test)
ISO 29465 Thermal insulating products for building applications — Determination EN 822
of length and width
ISO 29466 Thermal insulating products for building applications — Determination EN 823
of thickness
ISO 29467 Thermal insulating products for building applications — Determination EN 824
of squareness
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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
Respective
ISO standard Title
EN standard
ISO 29468 Thermal insulating products for building applications — Determination EN 825
of flatness
ISO 29469 Thermal insulating products for building applications — Determination EN 826
of compression behaviour
ISO 29470 Thermal insulating products for building applications — Determination EN ISO 29470
of the apparent density
ISO 29471 Thermal insulating products for building applications — Determination EN 1603
of dimensional stability under constant normal laboratory conditions
(23 °C/50 % relative humidity)
ISO 29472 Thermal insulating products for building applications — Determination EN 1604
of dimensional stability under specified temperature and humidity
conditions
ISO 29764 Thermal insulating products for building applications — Determination EN 1605
of deformation under specified compressive load and temperature
conditions
ISO 29765 Thermal insulating products for building applications — Determination EN 1607
of tensile strength perpendicular to faces
Thermal insulating products for building applications — Determination
ISO 29766 EN 1608
of tensile strength parallel to faces
ISO 29767 Thermal insulating products for building applications — Determination EN ISO 29767
of short-term water absorption by partial immersion
ISO 29768 Thermal insulating products for building applications — Determination EN 12085
of linear dimensions of test specimens
ISO 29769 Thermal insulating products for building applications — Determination EN 12430
of behaviour under point load
ISO 29770 Thermal insulating products for building applications — Determination EN 12431
of thickness for floating-floor insulating products
ISO 29771 Thermal insulating materials for building applications — EN 13820
Determination of organic content
ISO 29803 Thermal insulation products for building applications — Determination EN 13497
of the resistance to impact of external thermal insulation composite
systems (ETICS)
ISO 29804 Thermal insulation products for building applications — Determination EN 13494
of the tensile bond strength of the adhesive and of the base coat to the
thermal insulation material
ISO 29805 Thermal insulation products for building applications — Determination EN 13496
of the mechanical properties of glass fibre meshes
ISO 16534 Thermal insulating products for building applications — Determination EN ISO 16534
of compressive creep
ISO 16535 Thermal insulating products for building applications — Determination EN ISO 16535
of long-term water absorption by immersion
ISO 16536 Thermal insulating products for building applications — Determination EN ISO 16536
of long-term water absorption by diffusion
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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
Respective
ISO standard Title
EN standard
ISO 16537 Thermal insulating products for building applications — Determination EN 12090
of shear behaviour
ISO 16544 Thermal insulating products for building applications — Conditioning EN 12429
to moisture equilibrium under specified temperature and humidity
conditions
ISO 16545 Thermal insulating products for building applications — Determination EN 13793
of behaviour under cyclic loading
ISO 16546 Thermal insulating products for building applications — Determination EN 12091
of freeze-thaw resistance
This International Standard has been prepared for products used to insulate building equipment and
industrial installations, but it may also be applied to products used in other areas.
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oSIST prEN ISO 12629:2021

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oSIST prEN ISO 12629:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 12629:2021(E)
Thermal insulating products for building equipment and
industrial installations — Determination of water vapour
transmission properties of preformed pipe insulation
1 Scope
This International Standard specifies the equipment and procedure for determining the water vapour
transmission properties in the steady state under specified test conditions for test specimens of
preformed pipe insulation. It is applicable to thermal insulating products.
It is intended to be used for homogeneous materials (see Note below) and for products which may have
integral skins or adhered facings of some different material.
NOTE A material is considered to be homogeneous in terms of mass distribution if its density is approximately
the same throughout, i.e. if the measured density values are close to its mean density.
The water vapour transmission rate and permeance values are specific to the test specimen (i.e. the
product) thickness tested. For homogeneous products, the water vapour permeability is a property of the
material.
If the pipe insulation is cut from a flat product, then the water vapour transmission properties can be
obtained from tests carried out on the flat product with similar properties in accordance with ISO 12572.
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 12572, Hygrothermal performance of building materials and products — Determination of water
vapour transmission properties — Cup method
ISO 12628, Thermal insulating products for building equipment and industrial installations —
Determination of dimensions, squareness and linearity of preformed pipe insulation
ISO 29768, Thermal insulating products for building applications — Determination of linear dimensions of
test specimens
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9346 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
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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
— IEC Electropedia: available at http://www.electropedia.org/
3.1.1
water vapour flow rate
G
quantity of water vapour transmitted through the surface of the test specimen in mass divided by time
3.1.2
water vapour transmission rate
g
quantity of water vapour transmitted through unit area in mass divided by time under specified
conditions of temperature, humidity and thickness
3.1.3
water vapour permeance
W
quotient of water vapour transmission rate of the test specimen and the water vapour pressure difference
per area between the test specimen faces during the test
3.1.4
water vapour resistance
Z
inverse of water vapour permeance (1/W)
3.1.5
water vapour permeability
δ
product of the permeance and the thickness of the test specimen (δ = W · d)
Note 1 to entry: The water vapour permeability of a homogeneous product is a property of the material. It is the
quantity of water vapour transmitted per unit of time through a unit area of the product per unit of vapour pressure
difference between its faces for a unit thickness.
3.1.6
water vapour diffusion resistance factor
µ
quotient of the water vapour permeability of air and the water vapour permeability of the material or the
homogeneous product concerned
Note 1 to entry: It indicates the relative magnitude of the water vapour resistance of the product and that of an
equally thick layer of stationary air at the same temperature.
3.2 Symbols and units
The Symbols and units are given in Table 1.
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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
Table 1 — Symbols and Units
Symbol Quantity Unit
2
A area of specimen m
G water vapour flow rate through specimen kg/s
Rv gas constant for water vapour = 462 N·m/(kg⋅K)
T thermodynamic temperature K
2
W water vapour permeance with respect to partial vapour kg/(m⋅s⋅Pa)
pressure
2
Z water vapour resistance with respect to partial vapour m⋅s⋅Pa/kg
pressure
d mean thickness of specimen m
2
g density of water vapour flow rate kg/(m⋅s)
l length of the test specimen m
m mass of specimen kg
p barometric pressure hPa
p0 standard barometric pressure = 1 013,25 hPa
p is the water vapour saturation pressure hPa
s
t time s
Δp water vapour pressure difference across specimen Pa
δ water vapour permeability of the specimen kg/(m⋅s⋅Pa)
δ water vapour permeability of air kg/(m⋅s⋅Pa)
a
μ water vapour resistance factor —
ϑ celsius temperature °C
φ relative humidity —
NOTE The above units comply with ISO 9346; a conversion table to other units commonly used in permeability
measurements is given in ISO 12572:2016, Annex J.
3.3 Subscripts
The Subscripts are given in Table 2.
Table 2 — Subscripts
Subscript Denoting
1, 2 time steps, index
a air
i inside
o outside
4 Principle
A desiccant filled “dry cup” made from a preformed pipe insulation test specimen is placed in a test
atmosphere whose temperature and humidity are controlled. Because of the difference between the
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oSIST prEN ISO 12629:2021
ISO/DIS 12629:2021(E)
partial water vapour pressures in the test assembly and in the test atmosphere water vapour flows
through the test specimen, periodic weighings of the assembly are made to determine t
...