EN ISO 11357-8:2021

Plastics - Differential scanning calorimetry (DSC) - Part 8: Determination of thermal conductivity (ISO 11357-8:2021)

This document establishes a method for determination of the thermal conductivity of solid unfilled and filled or fibre reinforced plastics and composites by means of differential scanning calorimetry (DSC).
It is applicable for materials with thermal conductivities of up to 1 W/(m⋅K).

Kunststoffe - Dynamische Differenzkalorimetrie (DSC) - Teil 8: Bestimmung der Wärmeleitfähigkeit (ISO 11357 8:2021)

Dieses Dokument legt ein Verfahren zur Bestimmung der Wärmeleitfähigkeit von festen ungefüllten und gefüllten oder faserverstärkten Kunststoffen und Verbundstoffen durch die Dynamische Differenzkalorimetrie (DSC) fest.
Es ist anwendbar für Werkstoffe mit Wärmeleitfähigkeiten bis zu 1 W ⋅ m-1 ⋅ K-1.

Plastiques - Analyse calorimétrique différentielle (DSC) - Partie 8: Détermination de la conductivité thermique (ISO 11357-8:2021)

Le présent document établit une méthode pour la détermination de la conductivité thermique des plastiques solides chargés et non chargés ou renforcés de fibres et des composites par analyse calorimétrique différentielle (DSC).
Il est applicable aux matériaux avec des conductivités thermiques allant jusqu'à 1 W/(m⋅K).

Polimerni materiali - Diferenčna dinamična kalorimetrija (DSC) - 8. del: Ugotavljanje toplotne prevodnosti (ISO 11357-8:2021)

General Information

• Status: Published
• Publication Date: 02-Mar-2021
• Withdrawal Date: 29-Sep-2021
• ICS: 83.080.01 - Plastics in general
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 03-Mar-2021
• Completion Date: 03-Mar-2021
• Ref Project: SIST EN ISO 11357-8:2021 - Plastics - Differential scanning calorimetry (DSC) - Part 8: Determination of thermal conductivity (ISO 11357-8:2021)

Overview

EN ISO 11357-8:2021 - Plastics: Differential scanning calorimetry (DSC) - Part 8: Determination of thermal conductivity (ISO 11357-8:2021) defines a DSC-based method to determine the thermal conductivity of solid plastics and composites (unfilled, filled or fibre‑reinforced) with conductivities up to 1 W/(m·K). Published by CEN/ISO in 2021, the standard adapts a DSC measurement configuration to quantify heat flow through a specimen using a known melting substance placed on top of the sample.

Key topics and technical requirements

• Scope and applicability: Solid plastics and polymer composites; upper limit ~1 W/(m·K).
• Measurement principle: Specimen is placed on the DSC sample sensor, with an empty reference crucible in the reference position and a crucible containing a substance of known melting point (e.g., gallium) on top of the specimen. The slope of the melting peak and the differential heat flow between sample and reference are used, together with specimen thickness and temperature difference, to calculate thermal conductivity.
• Apparatus & materials:
  • DSC instrument compliant with ISO 11357‑1 (heat‑flux instruments verified; power‑compensated expected to be suitable).
  • Crucibles, a melting substance with known melting temperature, protective lacquers and measurement tools for specimen height.
• Specimen requirements: Defined geometry, sampling number and conditioning per standard atmospheres.
• Calibration & data: Use original raw DSC data only; calibration procedures and evaluation of melting-peak slopes are specified.
• Support information: Sections on calculation methodology, crucible service life (when using gallium), precision and bias, and an informative annex describing an interlaboratory study.

Applications and users

• Who uses it: Materials testing laboratories, plastics manufacturers, composite developers, R&D labs, quality and certification bodies requiring standardized thermal-property data.
• Practical value:
  • Enables concurrent measurement of specific heat capacity using the same DSC instrument; combined with density and thermal conductivity, users can calculate thermal diffusivity (thermal conductivity ÷ (density × specific heat capacity)).
  • Cost‑effective solution for labs that already possess DSC equipment - avoids procurement of separate thermal conductivity instruments.
  • Useful for thermal design, material selection, safety analysis and simulation inputs in electronics, automotive, building materials and composite component development.

Related standards

• ISO 11357‑1 - DSC: General principles
• ISO 291 - Standard atmospheres for conditioning and testing
• ISO 472 - Plastics vocabulary
• ISO 6344‑1 - Grain size analysis (referenced for specimen preparation)

EN ISO 11357‑8:2021 provides a standardized, DSC‑based procedure for reliable thermal‑conductivity data on plastics and composites, integrating naturally into laboratories that already perform DSC analyses.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2021
Polimerni materiali - Diferenčna dinamična kalorimetrija (DSC) - 8. del:
Ugotavljanje toplotne prevodnosti (ISO 11357-8:2021)
Plastics - Differential scanning calorimetry (DSC) - Part 8: Determination of thermal
conductivity (ISO 11357-8:2021)
Kunststoffe - Dynamische Differenz-Thermoanalyse (DSC) - Teil 8: Bestimmung der
Wärmeleitfähigkeit (ISO 11357-8:2021)
Plastiques - Analyse calorimétrique différentielle (DSC) - Partie 8: Détermination de la
conductivité thermique (ISO 11357-8:2021)
Ta slovenski standard je istoveten z: EN ISO 11357-8:2021
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11357-8
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 83.080.01
English Version
Plastics - Differential scanning calorimetry (DSC) - Part 8:
Determination of thermal conductivity (ISO 11357-
8:2021)
Plastiques - Analyse calorimétrique différentielle (DSC) Kunststoffe - Dynamische Differenz-Thermoanalyse
- Partie 8: Détermination de la conductivité thermique (DSC) - Teil 8: Bestimmung der Wärmeleitfähigkeit
(ISO 11357-8:2021) (ISO 11357-8:2021)
This European Standard was approved by CEN on 25 January 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11357-8:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11357-8:2021) has been prepared by Technical Committee ISO/TC 61 "Plastics"
in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by
NBN.
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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
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.
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 11357-8:2021 has been approved by CEN as EN ISO 11357-8:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 11357-8
First edition
2021-02
Plastics — Differential scanning
calorimetry (DSC) —
Part 8:
Determination of thermal conductivity
Plastiques — Analyse calorimétrique différentielle (DSC) —
Partie 8: Détermination de la conductivité thermique
Reference number
ISO 11357-8:2021(E)
©
ISO 2021
ISO 11357-8:2021(E)
© 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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 11357-8:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and substances. 2
5.1 DSC instrument . 2
5.2 Crucibles . 2
5.3 Melting substance . 2
5.4 Protective lacquer. 3
5.5 Length measuring device . 3
6 Specimens . 3
6.1 Geometry . 3
6.2 Number and sampling . 3
7 Conditioning . 3
8 Calibration . 4
9 Measurement procedure . 4
9.1 Preparation of crucibles . 4
9.2 Use of thermal contact substances . 4
9.3 Measurement of melting substance . 4
9.3.1 Placing of crucibles in sample holder . 4
9.3.2 Distribution of melting substance on crucible ground . 4
9.3.3 Measurement of the slope of the melting curve without test specimen . 5
9.3.4 Insertion of test specimen . 5
9.3.5 Measurement of the slope of the melting curve with test specimen . 5
9.4 Evaluation of the slope of the peaks of the melting substance . 5
10 Calculation of thermal conductivity . 7
11 Service life of crucibles upon using gallium as melting substance .7
12 Precision and bias . 7
13 Test report . 8
Annex A (informative) Interlaboratory determination of thermal conductivity measured by
means of DSC . 9
Bibliography .15
ISO 11357-8:2021(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 Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 11357 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 2021 – All rights reserved

ISO 11357-8:2021(E)
Introduction
The advantage of using DSC for measuring the thermal conductivity of plastics is that with the same
instrument also the specific heat capacity can be obtained. This enables the determination of the
thermal diffusivity by dividing the thermal conductivity by the density and specific heat capacity.
In addition, DSC instruments are widely used and available in almost all test institutes and labs. Hence,
measurements of thermal conductivity can be done without need for procurement of an additional
instrument.
INTERNATIONAL STANDARD ISO 11357-8:2021(E)
Plastics — Differential scanning calorimetry (DSC) —
Part 8:
Determination of thermal conductivity
1 Scope
This document establishes a method for determination of the thermal conductivity of solid unfilled and
filled or fibre reinforced plastics and composites by means of differential scanning calorimetry (DSC).
It is applicable for materials with thermal conductivities of up to 1 W/(m⋅K).
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 472, Plastics — Vocabulary
ISO 6344-1, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test
ISO 11357-1, Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and ISO 11357-1 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/
4 Principle
For the determination of thermal conductivity, the usual placement of the specimen in the sample
holder position is modified according to a procedure proposed in References [1] and [2] Additional
details on scientific background, deduction of results and performance of measurements can be found
in References [3] and [4].
An empty crucible is placed in the reference position of the sample holder assembly. The test specimen
is placed directly onto the sensor of the sample position and a crucible containing a substance of known
melting temperature is put on top of the specimen (see Figure 1). The thermal conductivity is measured
at a temperature slightly above the melting point of this substance in the small temperature range in
which the slope of the melting peak with test specimen is determined (see 9.4, Figure 2).
Upon heating, a temperature gradient is created in the specimen. The temperature of the top of
the specimen remains constant at the melting temperature T of the melting substance while the
m
temperature of the bottom side of the specimen corresponds to the temperature of the sample side
ISO 11357-8:2021(E)
sensor. The differential heat flow between sample and reference sensor is measured by the DSC
instrument.
From the temperature difference between top and bottom of the sample (T - T ), the sample height h
m p

and the heat flow rate difference Q between sample and the reference sensor, the thermal conductivity
of the specimen is determined.
Key
h height of specimen
 heat flow rate difference between sample and reference position
Q
S sensor of sample position
p
S sensor of reference position
r
T melting temperature of the known substance and the temperature of the top of the specimen
m
T temperature of the sample position and the bottom side of the specimen
p
T temperature of the reference position
r
Figure 1 — Schematic layout of measurement
5 Apparatus and substances
5.1 DSC instrument
A DSC instrument in accordance with specificati
...