Cellular plastics -- Determination of horizontal burning characteristics of small specimens subjected to a small flame

This document specifies a small-scale laboratory screening procedure for comparing the relative burning characteristics of horizontally oriented, small cellular plastic specimens having a density less than 250 kg⋅m−3 determined in accordance with ISO 845, when exposed to a small-flame ignition source. NOTE Another International Standard which covers flexible cellular plastic and cellular rubber is ISO 3582[2]. This method of test is intended for quality assurance and limited product evaluation of cellular plastic materials under controlled laboratory conditions, and is not intended to assess the fire behaviour of, for example, building materials or furnishings under actual fire conditions. The optional classification system described in Annex A is intended for the pre-selection of cellular plastic materials for products, including the determination of the ranges of material parameters that give the same classification (see 6.1).

Plastiques alvéolaires -- Détermination des caractéristiques de combustion de petites éprouvettes en position horizontale, soumises à une petite flamme

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Publication Date
23-Nov-2020
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5060 - Close of voting Proof returned by Secretariat
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INTERNATIONAL ISO
STANDARD 9772
Fourth edition
2020-11
Cellular plastics — Determination of
horizontal burning characteristics of
small specimens subjected to a small
flame
Plastiques alvéolaires — Détermination des caractéristiques de
combustion de petites éprouvettes en position horizontale, soumises à
une petite flamme
Reference number
ISO 9772:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 9772:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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

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

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 9772:2020(E)
Contents Page

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

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

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

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

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

4 Significance of test .............................................................................................................................................................................................. 2

5 Apparatus ..................................................................................................................................................................................................................... 3

6 Specimens .................................................................................................................................................................................................................... 7

6.1 Extended application of test results ..................................................................................................................................... 7

6.2 Preparation of specimens .............................................................................................................................................................. 8

7 Conditioning .............................................................................................................................................................................................................. 8

7.1 Specimens ................................................................................................................................................................................................... 8

7.2 Cotton indicator ..................................................................................................................................................................................... 9

8 Test procedure ........................................................................................................................................................................................................ 9

8.1 Adjustment of the flame .................................................................................................................................................................. 9

8.2 Adjustment of specimen support .........................................................................................................................................10

8.3 Positioning of cotton indicator ...............................................................................................................................................11

8.4 Positioning of specimen ...............................................................................................................................................................11

8.5 Burning procedure ...........................................................................................................................................................................11

8.6 Measurements ......................................................................................................................................................................................11

8.7 Preparation for the next test ....................................................................................................................................................12

9 Calculations.............................................................................................................................................................................................................12

10 Precision ....................................................................................................................................................................................................................13

11 Test report ................................................................................................................................................................................................................13

Annex A (informative) Classification system ............................................................................................................................................14

Bibliography .............................................................................................................................................................................................................................16

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 9772:2020(E)
Foreword

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

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

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

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

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

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

electrotechnical standardization.

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

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

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

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

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

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

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

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

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

constitute an endorsement.

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

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

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

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning

behaviour.

This fourth edition cancels and replaces the third edition (ISO 9772:2012), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— better definitions of positions of specimen on wire mesh and of burner have been provided;

— requirements for materials that show different damaged lengths on top and bottom faces of the

specimen have been specified;
— dimensions of cotton indicator have been reduced;
— reference to ASTM E2016 has been added.

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

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 9772:2020(E)
Introduction

Cellular plastics are widely used in products for packaging, building, housing, industry and transport,

in various applications. The burning behaviour of cellular plastics is a concern for the fire safety of these

products. This document gives a method for the determination of the burning behaviour of cellular

plastics using a small flame source.

The burning behaviour of cellular plastics is influenced by the test specimen orientation (vertical or

horizontal). This method of test evaluates specimens which are oriented horizontally.

The method described is also intended as a pre-selection test for materials used for components of

devices and appliances. The final acceptance of the material is dependent upon its use in complete

equipment that conforms with the standards applicable to such equipment.

It should be noted that the test results obtained by the test specified in this document alone cannot

represent all the aspects of the fire hazard of cellular plastics in end-use conditions.

© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 9772:2020(E)
Cellular plastics — Determination of horizontal burning
characteristics of small specimens subjected to a small
flame
1 Scope

1.1 This document specifies a small-scale laboratory screening procedure for comparing the relative

burning characteristics of horizontally oriented, small cellular plastic specimens having a density less

than 250 kg⋅m determined in accordance with ISO 845, when exposed to a small-flame ignition source.

[2]

NOTE Another International Standard which covers flexible cellular plastic and cellular rubber is ISO 3582 .

1.2 This method of test is intended for quality assurance and limited product evaluation of cellular

plastic materials under controlled laboratory conditions, and is not intended to assess the fire behaviour

of, for example, building materials or furnishings under actual fire conditions.

1.3 The optional classification system described in Annex A is intended for the pre-selection of cellular

plastic materials for products, including the determination of the ranges of material parameters that give

the same classification (see 6.1).
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 845, Cellular plastics and rubbers — Determination of apparent density
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 10093:2020, Plastics — Fire tests — Standard ignition sources
ISO 13943, Fire safety — Vocabulary
ASTM E2016, Standard Specification for Industrial Woven Wire Cloth

IEC 60695-11-3, Fire hazard testing — Part 11-3: Test flames — 500 W flames — Apparatus and

confirmational test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 9772:2020(E)
3.1
afterflame
flame that persists after the ignition source has been removed
[SOURCE: ISO 13943:2017, 3.11]
3.2
afterflame time
length of time for which an afterflame (3.1) persists under specified conditions
[SOURCE: ISO 13943:2017, 3.12]
3.3
afterglow

persistence of glowing combustion after both removal of the ignition source and the cessation of any

flaming combustion
[SOURCE: ISO 13943:2017, 3.13]
3.4
afterglow time
length of time for which an afterglow (3.3) persists under specified conditions
[SOURCE: ISO 13943:2017, 3.14]
3.5
extended application of test results

process of predicting a test result, on the basis of one or more existing test results obtained by the

same test, for a product for which a property and/or the intended end-use application(s) are subject to

variation
3.6
draught-free environment

space in which the results of experiments are not significantly affected by the local air speed

4 Significance of test

4.1 Tests conducted on a material under the conditions specified can be of considerable value when

comparing the horizontal burning characteristics of different materials, controlling manufacturing

processes or assessing any changes in formulation or treatment prior to use.

4.2 Assessment of fire hazard requires consideration of factors such as fuel contribution, intensity

of burning (rate of heat release) and products of combustion, as well as environmental factors such as

intensity of source, orientation of exposed material and ventilation conditions.

4.3 The horizontal burning characteristics, as measured by this test procedure, might be affected by

factors such as density, any anisotropy of the cellular material, its melting characteristics, its colour and

its thickness.

4.4 Certain materials might shrink from the applied flame without igniting. In this event, the test results

are not valid, and additional test specimens are required to obtain 10 valid test results. If this proves

impossible due to non-ignition of all the specimens, then this test is not suitable for these materials.

4.5 The horizontal burning characteristics of some cellular plastic materials might change with time,

and tests are therefore conducted before and after heat ageing.
2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 9772:2020(E)
5 Apparatus

5.1 A laboratory fume hood, having an inside volume of at least 0,5 m is used. The chamber shall

permit observation of tests in progress and shall provide a draught-free environment whilst allowing

normal thermal circulation of air past the test specimen during burning. The inside surfaces of

the chamber shall be of a dark colour. When a light meter, facing towards the rear of the chamber, is

positioned in place of the test specimen, the recorded light level shall be less than 20 lux.

For safety and convenience, this enclosure (which can be completely closed) shall be fitted with an

extraction device, such as an exhaust fan, to remove products of combustion that might be toxic. The

extraction device shall be turned off during the test and turned on again immediately after the test to

remove the fire effluents. A positive closing damper might be needed.

NOTE The amount of oxygen available to support combustion is naturally important for the conduct of these

flame tests. For tests conducted by this method when burning times are protracted, chamber sizes greater than

0,5 m might be needed to provide reproducible results.

5.2 P/PF2 laboratory burner, as specified in ISO 10093. The burner shall be the diffusion flame

burner specified in ISO 10093:2020, 11.3, having a barrel length of (100 ± 10) mm and an internal

diameter of (9,5 ± 0,3) mm. The barrel shall not be equipped with an end attachment, such as a stabilizer.

5.3 The burner shall be fitted with a burner wing top, having an opening of internal length (48 ± 1) mm

and internal width (1,3 ± 0,05) mm (see Figure 1).

To ensure the wing top opening is uniform in width, one option is to slide a (1,3 ± 0,05) mm steel wire

or spacer along its length.

5.4 The support gauze shall be a wire cloth of plain weave, approximately 215 mm long by 75 mm

wide, as shown in Figure 2. It shall consist of (6,4 ± 0,5) mm mesh gauze constructed of (0,9 ± 0,1) mm

diameter stainless steel, plain or low carbon steel wire. The cloth-mesh and wire diameter shall be

determined as described in the Standard Specification for Industrial Woven Wire Cloth, ASTM E2016.

5.5 The gauge-support holder shall consist of two laboratory ring stands with clamps adjustable to

the desired angles and heights. The gauze-support holder shall be constructed from aluminium or steel

and shall satisfy the following conditions:
— the long axis of the gauze shall be maintained to within 1° of the horizontal;

— the nearest end of the specimen shall be (13 ± 1) mm above the burner wing top (see Figure 2);

— the space both above and below the specimen shall not be obstructed;

— a means shall be provided for positioning the burner in the correct location relative to the specimen,

preferably with a sliding mechanism and a stop to allow fast movement of the burner flame towards

and away from the specimen;

— the gauze shall be equidistant from the front and back, and from both sides, of the test chamber, and

shall be (175 ± 25) mm above the cotton indicator base-board (see Figure 2).

5.6 There shall be two timing devices, each of which reads to within 1 s or less.

5.7 A measuring scale graduated in millimetres, shall be used to measure the length, width and

thickness of the test specimen.
© ISO 2020 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 9772:2020(E)
5.8 The gas supply shall consist of technical-grade methane gas with
...

INTERNATIONAL ISO
STANDARD 9772
Fourth edition
Cellular plastics — Determination of
horizontal burning characteristics of
small specimens subjected to a small
flame
Plastiques alvéolaires — Détermination des caractéristiques de
combustion de petites éprouvettes en position horizontale, soumises à
une petite flamme
PROOF/ÉPREUVE
Reference number
ISO 9772:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 9772:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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

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

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 9772:2020(E)
Contents Page

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

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

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

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

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

4 Significance of test .............................................................................................................................................................................................. 2

5 Apparatus ..................................................................................................................................................................................................................... 3

6 Specimens .................................................................................................................................................................................................................... 7

6.1 Extended application of test results ..................................................................................................................................... 7

6.2 Preparation of specimens .............................................................................................................................................................. 8

7 Conditioning .............................................................................................................................................................................................................. 8

7.1 Specimens ................................................................................................................................................................................................... 8

7.2 Cotton indicator ..................................................................................................................................................................................... 9

8 Test procedure ........................................................................................................................................................................................................ 9

8.1 Adjustment of the flame .................................................................................................................................................................. 9

8.1.1 Ensure that the fume hood fan is off. .............................................................................................................. 9

8.2 Adjustment of specimen support .........................................................................................................................................10

8.3 Positioning of cotton indicator ...............................................................................................................................................11

8.4 Positioning of specimen ...............................................................................................................................................................11

8.5 Burning procedure ...........................................................................................................................................................................11

8.6 Measurements ......................................................................................................................................................................................11

8.7 Preparation for the next test ....................................................................................................................................................12

9 Calculations.............................................................................................................................................................................................................12

10 Precision ....................................................................................................................................................................................................................13

11 Test report ................................................................................................................................................................................................................13

Annex A (informative) Classification system ............................................................................................................................................14

Bibliography .............................................................................................................................................................................................................................16

© ISO 2020 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 9772:2020(E)
Foreword

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

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

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

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

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

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

electrotechnical standardization.

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

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

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

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

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

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

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

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

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

constitute an endorsement.

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

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

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

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning

behaviour.

This fourth edition cancels and replaces the third edition (ISO 9772:2012), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— better definitions of positions of specimen on wire mesh and of burner have been provided;

— requirements for materials that show different damaged lengths on top and bottom faces of the

specimen have been specified;
— dimensions of cotton indicator have been reduced;
— reference to ASTM E2016 has been added.

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 PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 9772:2020(E)
Introduction

Cellular plastics are widely used in products for packaging, building, housing, industry and transport,

in various applications. The burning behaviour of cellular plastics is a concern for the fire safety of these

products. This document gives a method for the determination of the burning behaviour of cellular

plastics using a small flame source.

The burning behaviour of cellular plastics is influenced by the test specimen orientation (vertical or

horizontal). This method of test evaluates specimens which are oriented horizontally.

The method described is also intended as a pre-selection test for materials used for components of

devices and appliances. The final acceptance of the material is dependent upon its use in complete

equipment that conforms with the standards applicable to such equipment.

It should be noted that the test results obtained by the test specified in this document alone cannot

represent all the aspects of the fire hazard of cellular plastics in end-use conditions.

© ISO 2020 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 9772:2020(E)
Cellular plastics — Determination of horizontal burning
characteristics of small specimens subjected to a small
flame
1 Scope

1.1 This document specifies a small-scale laboratory screening procedure for comparing the relative

burning characteristics of horizontally oriented, small cellular plastic specimens having a density less

than 250 kg⋅m determined in accordance with ISO 845, when exposed to a small-flame ignition source.

[2]

NOTE Another International Standard which covers flexible cellular plastic and cellular rubber is ISO 3582 .

1.2 This method of test is intended for quality assurance and limited product evaluation of cellular

plastic materials under controlled laboratory conditions, and is not intended to assess the fire behaviour

of, for example, building materials or furnishings under actual fire conditions.

1.3 The optional classification system described in Annex A is intended for the pre-selection of cellular

plastic materials for products, including the determination of the ranges of material parameters that give

the same classification (see 6.1).
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 845, Cellular plastics and rubbers — Determination of apparent density
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 10093:— , Plastics — Fire tests — Standard ignition sources
ISO 13943, Fire safety — Vocabulary
ASTM E2016, Standard Specification for Industrial Woven Wire Cloth

IEC 60695-11-3, Fire hazard testing — Part 11-3: Test flames — 500 W flames — Apparatus and

confirmational test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
1) Under revision. Stage at the date of publication: ISO/FDIS 10093:2020.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 6 ----------------------
ISO 9772:2020(E)
3.1
afterflame
flame that persists after the ignition source has been removed
[SOURCE: ISO 13943:2017, 3.11]
3.2
afterflame time
length of time for which an afterflame (3.1) persists under specified conditions
[SOURCE: ISO 13943:2017, 3.12]
3.3
afterglow

persistence of glowing combustion after both removal of the ignition source and the cessation of any

flaming combustion
[SOURCE: ISO 13943:2017, 3.13]
3.4
afterglow time
length of time for which an afterglow (3.3) persists under specified conditions
[SOURCE: ISO 13943:2017, 3.14]
3.5
extended application of test results

process of predicting a test result, on the basis of one or more existing test results obtained by the

same test, for a product for which a property and/or the intended end-use application(s) are subject to

variation
3.6
draught-free environment

space in which the results of experiments are not significantly affected by the local air speed

4 Significance of test

4.1 Tests conducted on a material under the conditions specified can be of considerable value when

comparing the horizontal burning characteristics of different materials, controlling manufacturing

processes or assessing any changes in formulation or treatment prior to use.

4.2 Assessment of fire hazard requires consideration of factors such as fuel contribution, intensity

of burning (rate of heat release) and products of combustion, as well as environmental factors such as

intensity of source, orientation of exposed material and ventilation conditions.

4.3 The horizontal burning characteristics, as measured by this test procedure, might be affected by

factors such as density, any anisotropy of the cellular material, its melting characteristics, its colour and

its thickness.

4.4 Certain materials might shrink from the applied flame without igniting. In this event, the test results

are not valid, and additional test specimens are required to obtain 10 valid test results. If this proves

impossible due to non-ignition of all the specimens, then this test is not suitable for these materials.

4.5 The horizontal burning characteristics of some cellular plastic materials might change with time,

and tests are therefore conducted before and after heat ageing.
2 PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 9772:2020(E)
5 Apparatus

5.1 A laboratory fume hood, having an inside volume of at least 0,5 m is used. The chamber shall

permit observation of tests in progress and shall provide a draught-free environment whilst allowing

normal thermal circulation of air past the test specimen during burning. The inside surfaces of

the chamber shall be of a dark colour. When a light meter, facing towards the rear of the chamber, is

positioned in place of the test specimen, the recorded light level shall be less than 20 lux.

For safety and convenience, this enclosure (which can be completely closed) shall be fitted with an

extraction device, such as an exhaust fan, to remove products of combustion that might be toxic. The

extraction device shall be turned off during the test and turned on again immediately after the test to

remove the fire effluents. A positive closing damper might be needed.

NOTE The amount of oxygen available to support combustion is naturally important for the conduct of these

flame tests. For tests conducted by this method when burning times are protracted, chamber sizes greater than

0,5 m might be needed to provide reproducible results.

5.2 P/PF2 laboratory burner, as specified in IEC 60695-11-3, The burner shall be the diffusion flame

burner specified in ISO 10093:—, 11.3, having a barrel length of (100 ± 10) mm and an internal diameter

of (9,5 ± 0,3) mm. The barrel shall not be equipped with an end attachment, such as a stabilizer.

5.3 The burner shall be fitted with a burner wing top, having an opening of internal length (48 ± 1) mm

and internal width (1,3 ± 0,05) mm (see Figure 1).

To ensure the wing top opening is uniform in width, one option is to slide a (1,3 ± 0,05) mm steel wire

or spacer along its length.

5.4 The support gauze shall be a wire cloth of plain weave, approximately 215 mm long by 75 mm

wide, as shown in Figure 2. It shall consist of (6,4 ± 0,5) mm mesh gauze constructed of (0,9 ± 0,1) mm

diameter stainless steel, plain or low carbon steel wire. The cloth-mesh and wire diameter shall be

determined as described in the Standard Specification for Industrial Woven Wire Cloth, ASTM E2016.

5.5 The gauge-support holder shall consist of two laboratory ring stands with clamps adjustable to

the desired angles and heights. The gauze-support holder shall be constructed from aluminium or steel

and shall satisfy the following conditions:
— the long axis of the gauze shall be maintained to within 1° of the horizontal;

— the nearest end of the specimen shall be (13 ± 1) mm above the burner wing top (see Figure 2);

— the space both above and below the specimen shall not be obstructed;

— a means shall be provided for positioning the burner in the correct location relative to the specimen,

preferably with a sliding mechanism and a stop to allow fast movement of the burner flame towards

and away from the specimen;

— the gauze shall be equidistant from the front and back, and from both sides, of the test chamber, and

shall be (175 ± 25) mm above the cotton indicator base-board (see Figure 2).

5.6 There shall be two timing devices, each of which reads to within 1 s or less.

5.7 A measuring scale graduated in millimetres, shall be used to measure the length, width and

thickness of the test specimen.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 3
---------------------- Page: 8 ----------------------
ISO 9772:202
...

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