EN ISO 23766:2024
(Main)Thermal insulating products for industrial installations - Determination of the coefficient of linear thermal expansion at sub-ambient temperatures (ISO 23766:2022)
Thermal insulating products for industrial installations - Determination of the coefficient of linear thermal expansion at sub-ambient temperatures (ISO 23766:2022)
This document specifies the equipment and procedures for determining the coefficient of linear thermal expansion at sub-ambient temperatures (−196 °C to 25 °C), subject to the possible temperature limitation of the test specimens. It is not applicable to products which experience dimensional changes during the test due to the loss of hydration water or which undergo other phase changes.
Wärmedämmstoffe für Industrieanlagen - Bestimmung des linearen Wärmeausdehnungskoeffizienten bei Temperaturen unterhalb der Umgebungstemperatur (ISO 23766:2022)
Dieses Dokument legt die Geräte und Verfahren zur Bestimmung des linearen Wärmeausdehnungs-koeffizienten bei Temperaturen unterhalb der Umgebungstemperatur (−196 °C bis 25 °C) fest, abhängig von der möglichen Temperaturbegrenzung der Probekörper. Es ist nicht anwendbar für Produkte, die während der Prüfung durch den Verlust von Hydratationswasser Maßänderungen erfahren oder andere Phasen¬änderungen durchlaufen.
Produits isolants thermiques pour les installations industrielles - Détermination du coefficient de dilatation thermique linéique à des températures inférieures à la température ambiante (ISO 23766:2022)
Produits isolants thermiques pour les installations industrielles — Détermination du coefficient de dilatation thermique linéique à des températures inférieures à la température ambiante
Toplotnoizolacijski proizvodi za industrijske inštalacije - Določanje koeficienta linearne toplotne razteznosti pri temperaturah pod temperaturo okolja (ISO 23766:2022)
Ta dokument določa opremo in postopke za določanje koeficienta linearne toplotne razteznosti pri temperaturah pod temperaturo okolja (od −196 °C do 25 °C) ob upoštevanju morebitne temperaturne omejitve preskušancev. Ne uporablja se za proizvode, pri katerih pride med preskusom do dimenzijskih sprememb zaradi izgube hidratacijske vode oziroma drugih faznih sprememb.
General Information
Overview
EN ISO 23766:2024 / ISO 23766:2022 specifies methods for measuring the coefficient of linear thermal expansion (CLTE) of thermal insulating products for industrial installations at sub-ambient temperatures (−196 °C to 25 °C). Published by CEN as EN ISO 23766:2024, the standard defines equipment, procedures and reporting requirements for reliable determination of linear contraction/expansion of insulation materials used in cold and cryogenic applications. It excludes materials that change dimension because of loss of hydration water or other phase changes during testing.
Key topics and technical requirements
- Scope and exclusions: Test range −196 °C to 25 °C; not applicable to products undergoing dimensional change from dehydration or phase transitions.
- Two test methods:
- Method A - Optical method: Uses a planar, parallel light beam and detector (optical dilatometry) to measure dimensional change. Example apparatus uses an InGaN-based light source with a collimator keeping the beam parallel within 2″ (≈ 0.0097 mrad). Typical specimen sizes cited are 10 mm to 30 mm.
- Method B - Displacement method: Uses a distance/displacement sensor to record linear change as the specimen is cooled.
- Apparatus and accuracy:
- Test chamber capable of controlling specimen mean temperature to ±0.5 K and limiting temperature change rate to 1 °C/min.
- Cooling commonly provided by liquid nitrogen; chamber design must allow good temperature distribution and optical access when required.
- Temperature measurement with calibrated thermocouples of accuracy ±0.5 K.
- Light detector and sensors must be calibrated over the required measurement range.
- Specimen preparation and conditioning: The standard specifies dimensions, number and conditioning procedures to ensure reproducible results (see full standard for details).
- Calculation, reporting and measurement uncertainty: Procedures for calculating CLTE, expressing results and documenting test conditions are included.
Applications and practical value
- Material selection and specification for cryogenic piping, LNG storage, cold process lines, refrigeration and cold-chain infrastructure.
- Quality control and R&D for manufacturers of thermal insulating products.
- Engineering design input to predict thermal contraction, reduce mechanical stress, ensure tightness and maintain insulation integrity at low temperatures.
- Compliance testing for procurement and certification of industrial insulation systems.
Who should use this standard
- Test laboratories and third‑party certifiers
- Insulation product manufacturers and R&D teams
- Mechanical and cryogenic system designers and integrity engineers
- Specifiers and procurement professionals in industrial refrigeration, petrochemical and LNG sectors
Related standards
- ISO 9229 - Thermal insulation - Vocabulary
- ISO 18099 - Determination of the coefficient of thermal expansion (related methods)
Keywords: thermal insulating products, coefficient of linear thermal expansion, CLTE, sub-ambient temperatures, optical dilatometry, displacement method, EN ISO 23766:2024, cryogenic insulation.
Frequently Asked Questions
EN ISO 23766:2024 is a standard published by the European Committee for Standardization (CEN). Its full title is "Thermal insulating products for industrial installations - Determination of the coefficient of linear thermal expansion at sub-ambient temperatures (ISO 23766:2022)". This standard covers: This document specifies the equipment and procedures for determining the coefficient of linear thermal expansion at sub-ambient temperatures (−196 °C to 25 °C), subject to the possible temperature limitation of the test specimens. It is not applicable to products which experience dimensional changes during the test due to the loss of hydration water or which undergo other phase changes.
This document specifies the equipment and procedures for determining the coefficient of linear thermal expansion at sub-ambient temperatures (−196 °C to 25 °C), subject to the possible temperature limitation of the test specimens. It is not applicable to products which experience dimensional changes during the test due to the loss of hydration water or which undergo other phase changes.
EN ISO 23766:2024 is classified under the following ICS (International Classification for Standards) categories: 91.100.60 - Thermal and sound insulating materials. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN ISO 23766:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
Toplotnoizolacijski proizvodi za industrijske inštalacije - Določanje koeficienta
linearne toplotne razteznosti pri temperaturah pod temperaturo okolja (ISO
23766:2022)
Thermal insulating products for industrial installations - Determination of the coefficient of
linear thermal expansion at sub-ambient temperatures (ISO 23766:2022)
Wärmedämmstoffe für Industrieanlagen - Bestimmung des linearen
Wärmeausdehnungskoeffizienten bei Temperaturen unterhalb der
Umgebungstemperatur (ISO 23766:2022)
Produits isolants thermiques pour les installations industrielles - Détermination du
coefficient de dilatation thermique linéique à des températures inférieures à la
température ambiante (ISO 23766:2022)
Ta slovenski standard je istoveten z: EN ISO 23766:2024
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 23766
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 91.100.60
English Version
Thermal insulating products for industrial installations -
Determination of the coefficient of linear thermal
expansion at sub-ambient temperatures (ISO 23766:2022)
Produits isolants thermiques pour les installations Wärmedämmstoffe für Industrieanlagen - Bestimmung
industrielles - Détermination du coefficient de des linearen Wärmeausdehnungskoeffizienten bei
dilatation thermique linéique à des températures Temperaturen unterhalb der Umgebungstemperatur
inférieures à la température ambiante (ISO (ISO 23766:2022)
23766:2022)
This European Standard was approved by CEN on 5 May 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23766:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 23766:2022 has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment” of the International Organization for
Standardization (ISO) and has been taken over as EN ISO 23766:2024 by 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 November 2024, and conflicting national standards
shall be withdrawn at the latest by November 2024.
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.
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 23766:2022 has been approved by CEN as EN ISO 23766:2024 without any modification.
INTERNATIONAL ISO
STANDARD 23766
First edition
2022-03
Thermal insulating products
for industrial installations —
Determination of the coefficient of
linear thermal expansion at sub-
ambient temperatures
Produits isolants thermiques pour les installations industrielles —
Détermination du coefficient de dilatation thermique linéique à des
températures inférieures à la température ambiante
Reference number
ISO 23766:2022(E)
ISO 23766:2022(E)
© 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
ii
ISO 23766:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Method A — Optical method .1
4.1 Principle . 1
4.2 Apparatus . 2
4.2.1 Light source system . 2
4.2.2 Light detector system . 2
4.2.3 Test chamber and cooling system . 2
4.2.4 Temperature-measuring instruments . 3
4.2.5 Equipment to prepare the test specimen . 3
4.3 Test specimen . 3
4.3.1 Dimensions of test specimens . 3
4.3.2 Preparation of test specimens . 3
4.3.3 Number of test specimens . . 3
4.4 Conditioning of test specimens . 3
4.5 Procedure . 4
5 Method B — Displacement method . 4
5.1 Principle . 4
5.2 Apparatus . 5
5.2.1 Sensor for distance . 5
5.2.2 Test chamber and cooling system . 5
5.2.3 Temperature-measuring instruments . 5
5.2.4 Equipment to prepare the test specimen . 5
5.3 Test specimen . 5
5.3.1 Dimensions of test specimens . 5
5.3.2 Preparation of test specimens . 5
5.3.3 Number of test specimens . . 6
5.4 Conditioning of test specimens . 6
5.5 Procedure . 6
6 Calculation and expression of results . 6
7 Accuracy of measurement.7
8 Test report . 7
Bibliography . 9
iii
ISO 23766:2022(E)
Foreword
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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
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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.
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
INTERNATIONAL STANDARD ISO 23766:2022(E)
Thermal insulating products for industrial installations —
Determination of the coefficient of linear thermal
expansion at sub-ambient temperatures
1 Scope
This document specifies the equipment and procedures for determining the coefficient of linear
thermal expansion at sub-ambient t
...
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