Rubber- or plastics-coated fabrics -- Determination of fogging characteristics of trim materials in the interior of automobiles

This document specifies a test method which is intended to determine the fogging characteristics of rubber- or plastics-coated fabrics that are used as trim materials in the interior of motor vehicles. The method can also apply to fluid, pasty, powdered or solid raw materials which are the basis for such trim materials or from which the materials are manufactured. The method can also apply to other materials and finished products. The procedure is applicable to the measurement of fog condensate on glass surfaces within the limits of the test conditions. This test cannot measure accurately those cases in which: —   the surface tension of the condensate is low, resulting in early coalescing into a thin transparent film; —   the condensate is present in such a large quantity that the droplets coalesce and form a heavy oily/clear film (this heavy film gives false readings). In such cases, the gravimetric method is preferred.

Textiles revêtus de caoutchouc ou de plastique -- Détermination des caractéristiques d'embuage des matériaux de garnissage utilisés dans l'habitacle automobile

General Information

Status
Published
Publication Date
30-May-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
28-Apr-2021
Completion Date
28-Apr-2021
Ref Project

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INTERNATIONAL ISO
STANDARD 6452
Third edition
2021-05
Rubber- or plastics-coated
fabrics — Determination of fogging
characteristics of trim materials in the
interior of automobiles
Textiles revêtus de caoutchouc ou de plastique — Détermination des
caractéristiques d'embuage des matériaux de garnissage utilisés dans
l'habitacle automobile
Reference number
ISO 6452:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 6452:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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

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

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

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6452:2021(E)
Contents Page

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 1

5 Materials ....................................................................................................................................................................................................................... 2

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Test pieces and test samples .................................................................................................................................................................... 6

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

9 Procedure..................................................................................................................................................................................................................... 7

9.1 Cleaning ......................................................................................................................................................................................................... 7

9.1.1 General...................................................................................................................................................................................... 7

9.1.2 Cleaning with a dishwasher ................................................................................................................................... 7

9.2 Reference tests ........................................................................................................................................................................................ 7

9.3 Arrangement of test pieces and samples.......................................................................................................................... 8

9.4 Measurements prior to the fogging test ............................................................................................................................ 8

9.5 Fogging test ................................................................................................................................................................................................ 8

9.5.1 Set-up ......................................................................................................................................................................................... 8

9.5.2 Determination of fogging value, F .................................................................................................................... 9

9.5.3 Determination of mass of condensable constituents, G ................................................................ 9

10 Expression of results ........................................................................................................................................................................................ 9

10.1 Fogging value ............................................................................................................................................................................................ 9

10.2 Mass of the condensable constituents .............................................................................................................................10

11 Precision ....................................................................................................................................................................................................................10

12 Test report ................................................................................................................................................................................................................10

Annex A (informative) Precision ............................................................................................................................................................................12

Annex B (informative) Comparison between air chamber and oil bath test results .......................................15

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

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6452:2021(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 45, Rubber and rubber products,

Subcommittee SC 04, Products (other than hoses).

This third edition cancels and replaces the second edition (ISO 6452:2007), which has been technically

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

— air has been added as a suitable thermal transfer fluid for the test apparatus;

— a new Annex B on comparison between air chamber and oil bath test results has been added;

— precision data in Annex A have been updated with the results of an interlaboratory test program

(ITP) carried out in 2019-2020.

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
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6452:2021(E)
Rubber- or plastics-coated fabrics — Determination of
fogging characteristics of trim materials in the interior of
automobiles

WARNING — Persons using this document should be familiar with normal laboratory practice.

This document does not purport to address all of the safety problems, if any, associated with its

use. It is the responsibility of the user to establish appropriate safety and health practices and to

ensure compliance with any national regulatory conditions.
1 Scope

This document specifies a test method which is intended to determine the fogging characteristics of

rubber- or plastics-coated fabrics that are used as trim materials in the interior of motor vehicles.

The method can also apply to fluid, pasty, powdered or solid raw materials which are the basis for

such trim materials or from which the materials are manufactured. The method can also apply to other

materials and finished products.

The procedure is applicable to the measurement of fog condensate on glass surfaces within the limits of

the test conditions. This test cannot measure accurately those cases in which:

— the surface tension of the condensate is low, resulting in early coalescing into a thin transparent

film;

— the condensate is present in such a large quantity that the droplets coalesce and form a heavy oily/

clear film (this heavy film gives false readings).
In such cases, the gravimetric method is preferred.
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 2813, Paints and varnishes — Determination of gloss value at 20°, 60° and 85°

3 Terms and definitions
No terms and definitions are listed in this document.

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

A test piece or portion is heated in a glass beaker. Any volatile constituents are condensed on either a

cooled glass plate or a disc of cooled aluminium foil.
© ISO 2021 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 6452:2021(E)

The fogging value F is calculated as the quotient, in percent, of the gloss value for the glass plate with

fogging condensate and the gloss value of the same glass plate without fogging condensate. The gloss

values are measured in accordance with ISO 2813.

The mass of the condensable constituents G is given by the difference between the masses of the

aluminium foil disc before and after fogging.
5 Materials

5.1 Thermal transfer fluid, liquid or air, for the thermostatically controlled bath or chamber (6.1).

The fluid shall be temperature-stable and preferably water-soluble for easier cleaning. A suitable fluid is

a modified polyhydric aliphatic alcohol or air.
5.2 Glass-cleaning detergent, of a non-alkaline type.
5.3 Reference liquid, diisodecyl phthalate (DIDP) .
6 Apparatus

6.1 Thermostatically controlled bath or chamber, designed to operate at up to 130 °C. Safety

devices shall be fitted to prevent overheating. The circulation system, the bath or chamber capacity and

the heating system shall be such that the temperature can be kept constant to within ± 0,5 °C throughout

the bath or chamber. The agitation of the bath or chamber shall be done at a slow and uniform speed.

NOTE 1 It is very important to keep the temperature correct, as tests have shown that only a 0,5 °C difference

can be seen in the test results.

NOTE 2 Some heaters/circulators have a centrifugal pump in the bottom, pumping the liquid at high speed

around the bath. The beakers (6.3) will then have the liquid passing them at different speeds and this will cause

different temperatures in different beakers.

NOTE 3 Comparison between air chamber and oil bath test results is described in Annex B for reference.

The bath or chamber shall be designed so that, after placing the beakers (6.3) in the bath or chamber,

the temperature does not drop more than 5 °C, and the test temperature is regained after no more than

20 min. The minimum distance between the beakers and the walls shall be 30 mm and between the

bottom of the bath and the beakers 60 mm.

The bath or the chamber shall be equipped with a device indicating the distance between the fluid and

the lower surface of the glass plate (6.6). This distance shall be (60 ± 2) mm.

6.2 Cooling plates, designed to be placed on the glass plate (6.6) to keep them cool. The cooling

plate shall be hollow and made of corrosion-resistant metal, with the side facing the glass plate made

of aluminium. They shall have two cooling-water connections located so that the cooling water flows

through the whole of the interior of the plate. The surface in contact with the glass plate shall be flat.

When using liquid for thermal transfer fluid, the mass of a cooling plate filled with water shall be at least

1 kg, to overcome the buoyancy of the beaker (6.3) in the bath. The whole of the weight of the cooling

plate shall rest on the beaker. A separate cooling plate shall be used for each beaker.

The cooling plate and the associated water thermostat shall be designed so that the mean water

temperature is 21 °C and the difference in temperature between the inlet and outlet does not exceed

1 °C.

1) DIDP reference liquid can be obtained from: SP Technical Research Institute of Sweden, Chemistry and Materials

Technology, Box 857, SE-501 15 Borås, Sweden, Fax: +46 33 10 33 88, E-mail: info@sp .se. This information is given

for the convenience of users of this document and does not constitute an endorsement by ISO of the product named.

2 © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 6452:2021(E)

6.3 Flat-bottomed beakers, of heat-resistant glass, minimum mass 400 g, with the dimensions shown

in Figure 1.
Dimensions in millimetres
Ground.
Figure 1 — Glass beaker

6.4 Metal rings, external diameter 80 mm, internal diameter 74 mm, height 10 mm and mass

(55 ± 1) g, made of corrosion-protected steel, to keep the test pieces flat.

6.5 Sealing rings, of silicone- or fluoro-rubber, L-shaped or circular in cross-section, inner diameter

90 mm to 95 mm, thickness 2 mm to 4 mm and hardness 50 IRHD to 70 IRHD.
© ISO 2021 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 6452:2021(E)

6.6 Float glass plates, of residential or windshield window quality, for condensation of the fogging,

thickness (3 ± 0,2) mm, either square with minimum dimensions of (110 × 110) mm or circular with a

diameter of 103 mm. The gloss values of all the plates used shall be the same to within ± 2 % units. The

tin and non-tin surfaces of the plate shall be identified and the identification mark shall be placed on the

plate.

NOTE The tin and non-tin surfaces of the glass plate can be identified by viewing the surface in a darkened

room under a UV light at 254 nm wavelength. The tin surface fluoresces when it is exposed to the UV light.

6.7 Filter paper, with a diameter of 110 mm and a mass per unit surface area of 90 g/m .

6.8 Aluminium foil discs, thickness 0,03 mm, diameter (103 ± 1) mm. Store the prepared aluminium

foil disc in a desiccator (6.15) to avoid condensation and contamination.

6.9 Gloss meter, with a 60° incident beam and 60° measurement beam in accordance with ISO 2813.

6.10 Spacer, designed to prevent contact with the condensate on the glass plate during gloss meter

measurements, made of a suitable material such as paper or plastic with a circular hole for the

measurements. The thickness of the spacer shall be (0,1 ± 0,02) mm (see Figure 2).

4 © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 6452:2021(E)
Dimensions in millimetres
Key
1 float glass plate 4 tin surface of glass plate
2 spacer 5 non-tin surface of glass plate
3 circular holes for the measurements
Figure 2 — Example of a spacer on top of glass plate

6.11 Dishwasher, preferably connected to a deionized-water supply and capable of being operated at

80 °C.
6.12 Balance, with scale divisions of 0,01 mg.
6.13 Polyethylene gloves.
6.14 Tongs.
6.15 Desiccator, with suitable drying material.
An example of a test apparatus is shown in Figure 3.
© ISO 2021 – All rights reserved 5
---------------------- Page: 9 ----------------------
ISO 6452:2021(E)
Dimensions in millimetres
Key
1 beaker 7 thermal transfer fluid (liquid or air)
2 sealing ring 8 metal ring (i
...

INTERNATIONAL ISO
STANDARD 6452
Third edition
Rubber- or plastics-coated
fabrics — Determination of fogging
characteristics of trim materials in the
interior of automobiles
Textiles revêtus de caoutchouc ou de plastique — Détermination des
caractéristiques d'embuage des matériaux de garnissage utilisés dans
l'habitacle automobile
PROOF/ÉPREUVE
Reference number
ISO 6452:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 6452:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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

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

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

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6452:2021(E)
Contents Page

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 1

5 Materials ....................................................................................................................................................................................................................... 2

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Test pieces and test samples .................................................................................................................................................................... 5

8 Conditioning .............................................................................................................................................................................................................. 5

9 Procedure..................................................................................................................................................................................................................... 7

9.1 Cleaning ......................................................................................................................................................................................................... 7

9.1.1 General...................................................................................................................................................................................... 7

9.1.2 Cleaning with a dishwasher ................................................................................................................................... 7

9.2 Reference tests ........................................................................................................................................................................................ 7

9.3 Arrangement of test pieces and samples.......................................................................................................................... 7

9.4 Measurements prior to the fogging test ............................................................................................................................ 8

9.5 Fogging test ................................................................................................................................................................................................ 8

9.5.1 Set-up ......................................................................................................................................................................................... 8

9.5.2 Determination of fogging value, F .................................................................................................................... 8

9.5.3 Determination of mass of condensable constituents, G ................................................................ 9

10 Expression of results ........................................................................................................................................................................................ 9

10.1 Fogging value ............................................................................................................................................................................................ 9

10.2 Mass of the condensable constituents ................................................................................................................................ 9

11 Precision ....................................................................................................................................................................................................................10

12 Test report ................................................................................................................................................................................................................10

Annex A (informative) Precision ............................................................................................................................................................................11

Annex B (informative) Comparison between air chamber and oil bath test results .......................................14

Bibliography .............................................................................................................................................................................................................................15

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 6452:2021(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 45, Rubber and rubber products,

Subcommittee SC 04, Products (other than hoses).

This third edition cancels and replaces the second edition (ISO 6452:2007), which has been technically

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

— air has been added as a suitable thermal transfer fluid for the test apparatus;

— a new Annex B on comparison between air chamber and oil bath test results has been added;

— precision data in Annex A have been updated with the results of an interlaboratory test program

(ITP) carried out in 2019-2020.

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 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6452:2021(E)
Rubber- or plastics-coated fabrics — Determination of
fogging characteristics of trim materials in the interior of
automobiles

WARNING — Persons using this document should be familiar with normal laboratory practice.

This document does not purport to address all of the safety problems, if any, associated with its

use. It is the responsibility of the user to establish appropriate safety and health practices and to

ensure compliance with any national regulatory conditions.
1 Scope

This document specifies a test method which is intended to determine the fogging characteristics of

rubber- or plastics-coated fabrics that are used as trim materials in the interior of motor vehicles.

The method can also apply to fluid, pasty, powdered or solid raw materials which are the basis for

such trim materials or from which the materials are manufactured. The method can also apply to other

materials and finished products.

The procedure is applicable to the measurement of fog condensate on glass surfaces within the limits of

the test conditions. This test cannot measure accurately those cases in which:

— the surface tension of the condensate is low, resulting in early coalescing into a thin transparent film;

— the condensate is present in such a large quantity that the droplets coalesce and form a heavy oily/

clear film (this heavy film gives false readings).
In such cases, the gravimetric method is preferred.
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 2813, Paints and varnishes — Determination of gloss value at 20°, 60° and 85°

3 Terms and definitions
No terms and definitions are listed in this document.

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

A test piece or portion is heated in a glass beaker. Any volatile constituents are condensed on either a

cooled glass plate or a disc of cooled aluminium foil.

The fogging value F is calculated as the quotient, in percent, of the gloss value for the glass plate with

fogging condensate and the gloss value of the same glass plate without fogging condensate. The gloss

values are measured in accordance with ISO 2813.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 5 ----------------------
ISO 6452:2021(E)

The mass of the condensable constituents G is given by the difference between the masses of the

aluminium foil disc before and after fogging.
5 Materials

5.1 Thermal transfer fluid, liquid or air, for the thermostatically controlled bath or chamber (6.1).

The fluid shall be temperature-stable and preferably water-soluble for easier cleaning. A suitable fluid is

a modified polyhydric aliphatic alcohol or air.
5.2 Glass-cleaning detergent, of a non-alkaline type.
5.3 Reference liquid, diisodecyl phthalate (DIDP) .
6 Apparatus

6.1 Thermostatically controlled bath or chamber, designed to operate at up to 130 °C. Safety

devices shall be fitted to prevent overheating. The circulation system, the bath or chamber capacity and

the heating system shall be such that the temperature can be kept constant to within ± 0,5 °C throughout

the bath or chamber. The agitation of the bath or chamber shall be done at a slow and uniform speed.

NOTE 1 It is very important to keep the temperature correct, as tests have shown that only a 0,5 °C difference

can be seen in the test results.

NOTE 2 Some heaters/circulators have a centrifugal pump in the bottom, pumping the liquid at high speed

around the bath. The beakers (6.3) will then have the liquid passing them at different speeds and this will cause

different temperatures in different beakers.

NOTE 3 Comparison between air chamber and oil bath test results is described in Annex B for reference.

The bath or chamber shall be designed so that, after placing the beakers (6.3) in the bath or chamber,

the temperature does not drop more than 5 °C, and the test temperature is regained after no more than

20 min. The minimum distance between the beakers and the walls shall be 30 mm and between the

bottom of the bath and the beakers 60 mm.

The bath or the chamber shall be equipped with a device indicating the distance between the fluid and

the lower surface of the glass plate (6.6). This distance shall be (60 ± 2) mm.

6.2 Cooling plates, designed to be placed on the glass plate (6.6) to keep them cool. The cooling

plate shall be hollow and made of corrosion-resistant metal, with the side facing the glass plate made

of aluminium. They shall have two cooling-water connections located so that the cooling water flows

through the whole of the interior of the plate. The surface in contact with the glass plate shall be flat.

When using liquid for thermal transfer fluid, the mass of a cooling plate filled with water shall be at least

1 kg, to overcome the buoyancy of the beaker (6.3) in the bath. The whole of the weight of the cooling

plate shall rest on the beaker. A separate cooling plate shall be used for each beaker.

The cooling plate and the associated water thermostat shall be designed so that the mean water

temperature is 21 °C and the difference in temperature between the inlet and outlet does not exceed 1 °C.

6.3 Flat-bottomed beakers, of heat-resistant glass, minimum mass 400 g, with the dimensions shown

in Figure 1.

1) DIDP reference liquid can be obtained from: SP Technical Research Institute of Sweden, Chemistry and Materials

Technology, Box 857, SE-501 15 Borås, Sweden, Fax: +46 33 10 33 88, E-mail: info@sp .se. This information is given

for the convenience of users of this document and does not constitute an endorsement by ISO of the product named.

2 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 6452:2021(E)
Dimensions in millimetres
Ground.
Figure 1 — Glass beaker

6.4 Metal rings, external diameter 80 mm, internal diameter 74 mm, height 10 mm and mass

(55 ± 1) g, made of corrosion-protected steel, to keep the test pieces flat.

6.5 Sealing rings, of silicone- or fluoro-rubber, L-shaped or circular in cross-section, inner diameter

90 mm to 95 mm, thickness 2 mm to 4 mm and hardness 50 IRHD to 70 IRHD.

6.6 Float glass plates, of residential or windshield window quality, for condensation of the fogging,

thickness (3 ± 0,2) mm, either square with minimum dimensions of (110 × 110) mm or circular with a

diameter of 103 mm. The gloss values of all the plates used shall be the same to within ± 2 % units. The tin

and non-tin surfaces of the plate shall be identified and the identification mark shall be placed on the plate.

© ISO 2021 – All rights reserved PROOF/ÉPREUVE 3
---------------------- Page: 7 ----------------------
ISO 6452:2021(E)

NOTE The tin and non-tin surfaces of the glass plate can be identified by viewing the surface in a darkened

room under a UV light at 254 nm wavelength. The tin surface fluoresces when it is exposed to the UV light.

6.7 Filter paper, with a diameter of 110 mm and a mass per unit surface area of 90 g/m .

6.8 Aluminium foil discs, thickness 0,03 mm, diameter (103 ± 1) mm. Store the prepared aluminium

foil disc in a desiccator (6.15) to avoid condensation and contamination.

6.9 Gloss meter, with a 60° incident beam and 60° measurement beam in accordance with ISO 2813.

6.10 Spacer, designed to prevent contact with the condensate on the glass plate during gloss meter

measurements, made of a suitable material such as paper or plastic with a circular hole for the

measurements. The thickness of the spacer shall be (0,1 ± 0,02) mm (see Figure 2).

Dimensions in millimetres
Key
1 float glass plate 4 tin surface of glass plate
2 spacer 5 non-tin surface of glass plate
3 circular holes for the measurements
Figure 2 — Example of a spacer on top of glass plate
4 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 6452:2021(E)

6.11 Dishwasher, preferably connected to a deionized-water supply and capable of being operated

at 80 °C.
6.12 Balance, with scale divisions of 0,01 mg.
6.13 Polyethylene gloves.
6.14 Tongs.
6.15 Desiccator, with suitable drying material.
An example of a test apparatus is shown in Figure 3.
7 Test pieces and test samples

In the case of finished products, cut circular test pieces with a diameter of (80 ± 1) mm from the sample.

The thickness of the test pieces can be up to 10 mm. Machine
...

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