EN ISO 13927:2023

Plastics - Simple heat release test using a conical radiant heater and a thermopile detector (ISO 13927:2023)

This document specifies a method suitable for the production control or product development purposes for assessing the heat release rate of essentially flat products exposed in the horizontal orientation to controlled levels of radiant heating with an external igniter. The heat release rate is determined by the use of a thermopile instead of the more accurate oxygen consumption techniques. The time to ignition and sustained flaming are also measured in this test. The mass loss of the test specimen can also be measured optionally.

Kunststoffe - Einfache Prüfung der Wärmefreisetzung unter Anwendung eines kegelförmigen Strahlungsheizkörpers und einer Thermosäule als Detektor (ISO 13927:2023)

Plastiques - Essai simple pour la détermination du débit calorifique au moyen d'un radiateur conique et d'une sonde à thermopile (ISO 13927:2023)

Le présent document spécifie une méthode adaptée au contrôle de la production ou au développement de produit permettant l’évaluation du débit calorifique de produits essentiellement plats exposés suivant une orientation horizontale à des niveaux contrôlés de chaleur rayonnante, avec un dispositif d’allumage externe. Le débit calorifique est déterminé au moyen d’une thermopile plutôt qu’à l’aide de techniques plus précises de consommation d’oxygène. Le temps d’allumage et la flamme persistante sont aussi mesurés pendant cet essai. La perte de masse de l’éprouvette peut aussi être mesurée de manière facultative.

Polimerni materiali - Preprost preskus za ugotavljanje sproščene toplote z uporabo koničnega radiacijskega grelnika in detektorja iz termoelektrične baterije (ISO/DIS 13927:2022)

General Information

• Status: Published
• Publication Date: 05-Sep-2023
• 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: 06-Sep-2023
• Completion Date: 06-Sep-2023
• Ref Project: oSIST prEN ISO 13927:2023 - Plastics - Simple heat release test using a conical radiant heater and a thermopile detector (ISO/DIS 13927:2022)

Relations

• Replaces: EN ISO 13927:2015 - Plastics - Simple heat release test using a conical radiant heater and a thermopile detector (ISO 13927:2015)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 13927:2023
01-februar-2023
Polimerni materiali - Preprost preskus za ugotavljanje sproščene toplote z
uporabo koničnega radiacijskega grelnika in detektorja iz termoelektrične baterije
(ISO/DIS 13927:2022)
Plastics - Simple heat release test using a conical radiant heater and a thermopile
detector (ISO/DIS 13927:2022)
Kunststoffe - Einfache Prüfung der Wärmefreisetzung unter Anwendung eines
kegelförmigen Strahlungsheizkörpers und einer Thermosäule als Detektor (ISO/DIS
13927:2022)
Plastiques - Essai simple pour la détermination du débit calorifique au moyen d'un
radiateur conique et d'une sonde à thermopile (ISO/DIS 13927:2022)
Ta slovenski standard je istoveten z: prEN ISO 13927
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 13927:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 13927:2023

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oSIST prEN ISO 13927:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 13927
ISO/TC 61/SC 4 Secretariat: BSI
Voting begins on: Voting terminates on:
2022-12-26 2023-03-20
Plastics — Simple heat release test using a conical radiant
heater and a thermopile detector
Plastiques — Essai simple pour la détermination du débit calorifique au moyen d'un radiateur conique et
d'une sonde à thermopile
ICS: 83.080.01
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
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 13927:2022(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 2022

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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 13927
ISO/TC 61/SC 4 Secretariat: BSI
Voting begins on: Voting terminates on:

Plastics — Simple heat release test using a conical radiant
heater and a thermopile detector
Plastiques — Essai simple pour la détermination du débit calorifique au moyen d'un radiateur conique et
d'une sonde à thermopile
ICS: 83.080.01
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 13927:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
  © ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022

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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Apparatus . 2
6.1 General . 2
6.2 Cone-shaped radiant electrical heater . 4
6.3 Heat flux controller . 4
6.4 Chimney and Thermopiles . 5
6.5 Specimen holder . 5
6.6 Retainer frame . 5
6.7 Fume extraction system. 7
6.8 Ignition circuit . 7
6.9 Ignition timer . 8
6.10 Heat flux meter . 8
6.11 Calibration burner . 8
6.12 Data collection system . . 8
7 Suitability of a product for testing .9
7.1 Surface characteristics . 9
7.2 Asymmetrical products . 10
7.3 Thin materials . 10
7.4 Composite specimens . 10
7.5 Dimensionally unstable materials . 10
7.6 Materials that require testing under compression . 11
8 Specimen construction and preparation .11
8.1 Specimens . 11
8.2 Conditioning of specimens .12
8.3 Preparation .12
8.3.1 Specimen wrapping .12
8.3.2 Specimen preparation .13
8.3.3 Preparing specimens of materials that require testing under compression.13
9 Calibration .14
9.1 Heater calibration . 14
9.2 Thermopile calibration . 14
9.2.1 General . 14
9.2.2 Initial calibration . 14
9.2.3 Daily calibration . . . 14
10 Test procedure .15
10.1 General precautions . 15
10.2 Initial preparation .15
10.3 Procedure . 15
11 Precision .16
12 Test report .16
Annex A (normative) Calibration of the heat flux meter .18
Annex B (informative) Guidance notes for operators.19
iii
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Annex C (informative) Guidance on measuring mass loss during testing .20
Annex D (informative) An example of thermopile calibration .21
Annex E (informative) Calculation of effective critical heat flux for ignition .23
Bibliography .24
iv
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(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 [or Project Committee] ISO/TC 61, Plastics,
Subcommittee SC 4, Burning behaviour.
This third edition cancels and replaces the second edition (ISO 13927:2015), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— normative use the most recent edition of ISO standards in clause 2
— use of mass flow rate of methane gas corresponding to the net heat of combustion for calibration of
the thermopile in clause 9
— presentation of an example of thermopile calibration by informative Annex D
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.
v
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Introduction
Fire is a complex phenomenon; its behaviour and effects depend upon a number of interrelated factors.
The behaviour of materials and products depends upon the characteristics of the fire, the method of use
of the materials, and the environment in which they are exposed (see also ISO 13943).
A test such as the one specified in this International Standard deals only with a simple representation
of a particular aspect of the potential fire situation, typified by a radiant heat source, and it cannot
alone provide any direct guidance on the behaviour or safety in fire. A test of this type can, however,
be used for comparative purposes or to ensure the existence of a certain quality of performance (in
this case, heat release from a composite material or an assembly) considered to have a bearing on fire
performance generally. It would be wrong to attach any other meaning to performance in this test. The
attention of all users of this test is drawn to the warning that immediately precedes Clause 10.
vi
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oSIST prEN ISO 13927:2023
DRAFT INTERNATIONAL STANDARD ISO/DIS 13927:2022(E)
Plastics — Simple heat release test using a conical radiant
heater and a thermopile detector
1 Scope
This document specifies a method suitable for the production control or product development purposes
for assessing the heat release rate of essentially flat products exposed in the horizontal orientation to
controlled levels of radiant heating with an external igniter. The heat release rate is determined by the
use of a thermopile instead of the more accurate oxygen consumption techniques. The time to ignition
and sustained flaming are also measured in this test. The mass loss of the test specimen can also be
measured optionally.
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 13943, Fire safety — Vocabulary
ISO 14697, Reaction-to-fire tests — Guidance on the choice of substrates for building and transport products
ISO 14934-3, Fire tests — Calibration and use of heat flux meters — Part 3: Secondary calibration method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.
3.1
essentially flat surface
surface whose irregularity from a plane does not exceed ±1 mm
3.2
ignition
onset of sustained flaming (3.7)
3.3
material
single substance or uniformly dispersed mixture, for example, metal, stone, timber, concrete, mineral
fibre, or polymer
3.4
orientation
plane in which the exposed face of the specimen is located during testing either vertical or horizontal
face upwards
3.5
product
material, composite or assembly, about which information is required
1
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
3.6
test specimen
representative piece of the product which is to be tested together with any substrate or surface
treatment
Note 1 to entry: The test specimen may include an air gap.
3.7
sustained flaming
existence of flame on or over the surface of the specimen for a period of over 10 s
3.8
transitory flaming
existence of flame on or over the surface of the specimen for a period of between 1 s and 10 s
4 Symbols
t time to ignition (onset of sustained flaming), expressed in seconds (s)
ig
2
′′
q
heat release rate per unit area at 180 s after ignition, expressed in kilowatts (kW/m )
180
2
′′
q
heat release rate per unit area at 300 s after ignition, expressed in kilowatts (kW/m )
300
2
q′′
maximum heat release rate per unit area, expressed in kilowatts (kW/m )
max
5 Principle
The heat release rate is assessed by measurement of the output of a thermopile located in a chimney
situated above a burning test specimen that is subjected to a known heat flux from a conical heater.
2
The output (in mV) is converted into heat release rate per unit area (in kW/m ) by use of a calibration
graph obtained previously by burning methane gas of known heat of combustion in the same apparatus.
Informative guidance is given in Annex B. The specimen mass loss rate during the test can also be
measured by continuously recording the specimen load cell output. An informative guidance is given in
Annex C.
6 Apparatus
6.1 General
The test apparatus shall consist essentially of the following components: a cone-shaped radiant heater, a
chimney housing a thermopile, a load cell, a specimen holder, and a fume extraction system. A schematic
representation of the assembly is given in Figure 1. The individual components are described below.
Intoleranced dimensions are recommended values, but should be followed closely.
2
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Dimensions in millimetres
Key
1 thermopile
2 chimney
3 cone heater
4 spark igniter
5 specimen
6 load cell (optional)
Figure 1 — Schematic drawing of apparatus
3
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
6.2 Cone-shaped radiant electrical heater
The active element of the heater shall consist of an electrical heater rod, capable of delivering 5 000 W
at the operating voltage, tightly wound into the shape of a truncated cone (see Figure 2). The heater
shall be encased on the outside with a double-walled, stainless-steel cone filled between the walls
3
with a refractory blanket of nominal thickness 13 mm and nominal density 100 kg/m . The heat flux
from the heater shall be maintained at a pre-set level by controlling the average temperature of three
thermocouples (type K stainless-steel sheathed thermocouples have provided suitable but Inconel or
other high performance materials are also acceptable), symmetrically disposed and in contact with,
but not welded to, the heater element (see Figure 2). 1,0 mm to 1,6 mm outside diameter sheathed
(unearthed) thermocouples with an unexposed hot junction may be used. The heater shall be capable
2
of producing heat fluxes on the surface of the specimen of up to 75 kW/m . The heat flux shall be
uniform within the central 50 mm × 50 mm area of the exposed specimen surface to within ±2 % for an
2
irradiance of 50 kW/m .
The cone heater shall be provided with a removable radiation shield to protect immediately the
specimen from heat prior to the start of the test.
6.3 Heat flux controller
The heat flux control system shall maintain the average temperature of the heater element steady to
within ±2 °C.
Dimensions in millimetres
Key
1 inner shell
2 refractory-fibre packing
3 thermocouple
4 outer shell
5 spacer block
6 heating element
Figure 2 — Cross-sectional view through heater
4
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
6.4 Chimney and Thermopiles
A circular cross-section chimney 600 mm ± 2 mm long and 115 mm ± 2 mm internal diameter
constructed from 1-mm-thick stainless steel shall be used to house the thermopiles. This shall be fixed
on top of the top-plate of the cone heater. The axis of the chimney shall coincide with the axis of the
cone heater.
Each thermopile shall consist of four 1,6 mm ± 0,2 mm outside diameter type K sheathed thermocouples.
The tips of the thermocouples shall be fixed 17 mm from the centreline of the chimney. The four
thermocouples shall be connected in series and the two ends shall be connected to the data collection
system.
A thermopile shall be housed within the chimney at a height of 550 mm above the cone top-plate and
the chimney penetration points shall be equally distributed about the circumference of the chimney.
Another thermopile shall be housed 275 mm above the cone top-plate and the chimney penetration
points are equally distributed across, about the circumference of the chimney.
The arrangement of the chimney and thermopiles is shown in Figure 1.
Both thermopiles shall be calibrated individually according to clause 9.
6.5 Specimen holder
The specimen holder is shown in Figure 3.
The specimen holder shall have the shape of a square pan with an opening of (106 ± 1) mm × (106 ± 1) mm
and a depth of 25 mm. The holder shall be constructed from stainless steel with a thickness of
(2,4 ± 0,15) mm. It shall include a handle to facilitate insertion and removal and a mechanism to ensure
central location of the specimen under the heater and proper alignment with the weighing device. The
distance between the bottom surface of the cone heater and the top of the specimen shall be adjusted
to 25 mm, except when testing dimensionally unstable materials, in which case, the distance shall be
adjusted to 60 mm ± 1 mm. All tests shall be conducted with the retainer frame shown in Figure 4.
Details of specimen and specimen holder preparation are given in 8.3.
6.6 Retainer frame
The frame shall be constructed of stainless steel with a thickness of (1,9 ± 0,1) mm in the shape of a box
with an inside dimension of each side (111 ± 1) mm and a height of (54 ± 1) mm. The opening for the
specimen face shall be (94,0 ± 0,5) mm square as shown in Figure 4. The retainer frame shall have an
appropriate means to secure it to the specimen holder with a specimen in position.
5
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Dimensions in millimetres
Figure 3 — Specimen holder
6
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
Key
1 tapped holes in four places (M3 or 10 × 32 recommended)
Figure 4 — Retainer frame
6.7 Fume extraction system
The apparatus shall be used under a hood or in a fume cupboard with adequate ventilation to remove
safely combustion products from the laboratory.
6.8 Ignition circuit
Specimen ignition shall be accomplished by a spark plug powered by a 10 kV transformer or a 10 kV spark
generator capable of continuous sparking. The spark electrodes shall have a gap of 3 mm + 0,5 mm. If
a transformer is used, it shall be of a type specifically designed for spark ignition use. The transformer
shall have an isolated (unearthed) secondary to minimize interference with the data transmission
lines. The electrode length and location of the spark plug shall be such that the spark gap is located
13 mm + 2 mm above the centre of the specimen in the horizontal orientation.
7
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oSIST prEN ISO 13927:2023
ISO/DIS 13927:2022(E)
6.9 Ignition timer
The timer shall be capable of recording elapsed time to the nearest second and accurate to within 1 s in
1 h.
6.10 Heat flux meter
The heat flux meter shall be of the Schmidt-Boelter (thermopile) type with a design range of up to about
2
100 kW/m . The target receiving radiation, and possibly to a small extent convection, shall be flat and
circular of approximately 12,5 mm in diameter and coated with a durable matt-black finish of surface
emissivity ε = 0,95 ± 0,05. The target shall be water-cooled, but care shall be taken that this does not
cause water condensation on the target surface of the meter.
Radiation shall not pass through any window before reaching the target. The instrument shall be
robust, simple to set up and use, and stable in calibration. The instrument shall also have an accuracy of
within ±3 % and a repeatability of within 0,5 %.
The calibration of the heat flux meter shall be checked whenever recalibration of the apparatus is
carried out, as described in Annex A or ISO 14934-3.
6.11 Calibration burner
The calibration burner shall consist of a square pan with a top opening of (100 -2/+0) mm × (100-
2/+0) mm, constructed from stainless steel of thickness 2,4 mm ± 0,1 mm, and filled
...