ISO 21066:2018
(Main)Fine ceramics (advanced ceramics, advanced technical ceramics) — Qualitative and semiquantitative assessment of the photocatalytic activities of surfaces by the reduction of resazurin in a deposited ink film
Fine ceramics (advanced ceramics, advanced technical ceramics) — Qualitative and semiquantitative assessment of the photocatalytic activities of surfaces by the reduction of resazurin in a deposited ink film
This document specifies a method, the Resazurin (Rz) ink test, for the qualitative assessment of the activity of a photocatalytic surface, and its classification as below, within, or above the applicable range of the test. The method then allows for the subsequent semiquantitative evaluation of the activities of photocatalytic surfaces that are within the applicable range of the test. In all cases, artificial ultraviolet (UV) radiation is used. The test method specified is appropriate for use with all flat, smooth, photocatalytic surfaces, which are not macroporous, examples of which include: commercial photocatalytic glass, paint, tiles and awning materials. The method is not applicable to assessing the visible-light activity of photocatalytic surfaces, nor their ability to effect: air purification, water purification, self-cleaning or disinfection, although some relevant correlations have been reported[4][5].
Céramiques techniques (céramiques avancées, céramiques techniques avancées) — Évaluation qualitative et semi-quantitative de l’activité photocatalytique des surfaces par réduction de résazurine dans un film d’encre déposé
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INTERNATIONAL ISO
STANDARD 21066
First edition
2018-09
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Qualitative and semiquantitative
assessment of the photocatalytic
activities of surfaces by the reduction
of resazurin in a deposited ink film
Céramiques techniques (céramiques avancées, céramiques techniques
avancées) — Évaluation qualitative et semi-quantitative de l’activité
photocatalytique des surfaces par réduction de résazurine dans un
film d’encre déposé
Reference number
©
ISO 2018
© ISO 2018
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 List of symbols, abbreviations and units . 2
5 Principle . 3
5.1 General . 3
5.2 Qualitative test method (three samples) . 3
5.3 Semiquantitative test method (eight samples) . 3
6 Apparatus . 4
6.1 Coating device . 4
6.2 UV-radiation light source . 4
6.3 UV radiometer . 4
6.4 Irradiation system . 4
6.5 Digital imaging device and analysis software . 5
7 Materials . 6
7.1 Rz ink preparation . 6
7.1.1 Dye purity test (if purity is unknown) . 6
7.1.2 Ink preparation . 7
7.2 Rz ink quality assurance . 7
8 Test sample . 8
8.1 Preparation of test samples . 8
8.2 Cleaning of test samples . 8
8.3 Coating test samples with Rz ink . 8
9 Procedure for the qualitative assessment of activity . 9
9.1 General . 9
9.2 Procedure .10
10 Procedure for the semiquantitative assessment of activity .10
10.1 General .10
10.2 Procedure .10
10.3 Digital image (RGB) analysis (for one sample) .10
10.4 Data analysis .12
11 Test report .12
11.1 Qualitative assessment of activity .12
11.2 Semiquantitative assessment of activity.12
Annex A (informative) Example of Rz ink qualitative test report on samples of a commercial
type of photocatalyst-based, self-cleaning glass.14
Annex B (informative) Example of Rz ink semiquantitative test report on samples of a
[8]
commercial type of photocatalyst-based, self-cleaning glass .15
Annex C (informative) Results of inter-laboratory test .17
Bibliography .18
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 206, Fine ceramics.
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 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 21066:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Qualitative and semiquantitative assessment
of the photocatalytic activities of surfaces by the reduction
of resazurin in a deposited ink film
1 Scope
This document specifies a method, the Resazurin (Rz) ink test, for the qualitative assessment of the
activity of a photocatalytic surface, and its classification as below, within, or above the applicable range
of the test. The method then allows for the subsequent semiquantitative evaluation of the activities of
photocatalytic surfaces that are within the applicable range of the test. In all cases, artificial ultraviolet
(UV) radiation is used.
The test method specified is appropriate for use with all flat, smooth, photocatalytic surfaces, which are
not macroporous, examples of which include: commercial photocatalytic glass, paint, tiles and awning
materials. The method is not applicable to assessing the visible-light activity of photocatalytic surfaces,
nor their ability to effect: air purification, water purification, self-cleaning or disinfection, although
[4][5]
some relevant correlations have been reported .
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 10677, Fine ceramics (advanced ceramics, advanced technical ceramics) — Ultraviolet light source for
testing semiconducting photocatalytic materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
photocatalyst
substance that performs one or more functions based on coupled oxidation and reduction reactions
under photo-irradiation, including decomposition and removal of air and water contaminants,
deodorization, and antibacterial, self-cleaning and antifogging actions
[SOURCE: ISO 22197-1:2016, 3.1, modified — The definition has been slightly rephrased.]
3.2
photocatalytic material
material in which, or on which, a photocatalyst (3.1) is added by coating, impregnation, mixing, etc.
[SOURCE: ISO 20507:2014, 2.1.60, modified — Note 1 to entry removed.]
3.3
macroporous surface
surface having sufficient cavities, typically larger than 75 μm, so that Rz ink (3.5) drains from it by
gravity and is not held by capillary action
EXAMPLE Some concrete samples and most woven fabrics.
3.4
smooth surface
surface that can be uniformly coated with Rz ink (3.5) using a close wound standard K-bar (3.6), number
3, which delivers a wet film thickness of 24 μm
3.5
Rz ink
resazurin-based ink used to assess the activity of a photocatalytic surface
3.6
K-bar
steel rod, close wound with wire of a defined gauge so as to deliver a wet ink film of a desired thickness,
as commonly used in the print industry
4 List of symbols, abbreviations and units
Designation Symbol or abbreviation Unit
Irradiation
...
INTERNATIONAL ISO
STANDARD 21066
First edition
2018-09
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Qualitative and semiquantitative
assessment of the photocatalytic
activities of surfaces by the reduction
of resazurin in a deposited ink film
Céramiques techniques (céramiques avancées, céramiques techniques
avancées) — Évaluation qualitative et semi-quantitative de l’activité
photocatalytique des surfaces par réduction de résazurine dans un
film d’encre déposé
Reference number
©
ISO 2018
© ISO 2018
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 List of symbols, abbreviations and units . 2
5 Principle . 3
5.1 General . 3
5.2 Qualitative test method (three samples) . 3
5.3 Semiquantitative test method (eight samples) . 3
6 Apparatus . 4
6.1 Coating device . 4
6.2 UV-radiation light source . 4
6.3 UV radiometer . 4
6.4 Irradiation system . 4
6.5 Digital imaging device and analysis software . 5
7 Materials . 6
7.1 Rz ink preparation . 6
7.1.1 Dye purity test (if purity is unknown) . 6
7.1.2 Ink preparation . 7
7.2 Rz ink quality assurance . 7
8 Test sample . 8
8.1 Preparation of test samples . 8
8.2 Cleaning of test samples . 8
8.3 Coating test samples with Rz ink . 8
9 Procedure for the qualitative assessment of activity . 9
9.1 General . 9
9.2 Procedure .10
10 Procedure for the semiquantitative assessment of activity .10
10.1 General .10
10.2 Procedure .10
10.3 Digital image (RGB) analysis (for one sample) .10
10.4 Data analysis .12
11 Test report .12
11.1 Qualitative assessment of activity .12
11.2 Semiquantitative assessment of activity.12
Annex A (informative) Example of Rz ink qualitative test report on samples of a commercial
type of photocatalyst-based, self-cleaning glass.14
Annex B (informative) Example of Rz ink semiquantitative test report on samples of a
[8]
commercial type of photocatalyst-based, self-cleaning glass .15
Annex C (informative) Results of inter-laboratory test .17
Bibliography .18
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 206, Fine ceramics.
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 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 21066:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Qualitative and semiquantitative assessment
of the photocatalytic activities of surfaces by the reduction
of resazurin in a deposited ink film
1 Scope
This document specifies a method, the Resazurin (Rz) ink test, for the qualitative assessment of the
activity of a photocatalytic surface, and its classification as below, within, or above the applicable range
of the test. The method then allows for the subsequent semiquantitative evaluation of the activities of
photocatalytic surfaces that are within the applicable range of the test. In all cases, artificial ultraviolet
(UV) radiation is used.
The test method specified is appropriate for use with all flat, smooth, photocatalytic surfaces, which are
not macroporous, examples of which include: commercial photocatalytic glass, paint, tiles and awning
materials. The method is not applicable to assessing the visible-light activity of photocatalytic surfaces,
nor their ability to effect: air purification, water purification, self-cleaning or disinfection, although
[4][5]
some relevant correlations have been reported .
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 10677, Fine ceramics (advanced ceramics, advanced technical ceramics) — Ultraviolet light source for
testing semiconducting photocatalytic materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
photocatalyst
substance that performs one or more functions based on coupled oxidation and reduction reactions
under photo-irradiation, including decomposition and removal of air and water contaminants,
deodorization, and antibacterial, self-cleaning and antifogging actions
[SOURCE: ISO 22197-1:2016, 3.1, modified — The definition has been slightly rephrased.]
3.2
photocatalytic material
material in which, or on which, a photocatalyst (3.1) is added by coating, impregnation, mixing, etc.
[SOURCE: ISO 20507:2014, 2.1.60, modified — Note 1 to entry removed.]
3.3
macroporous surface
surface having sufficient cavities, typically larger than 75 μm, so that Rz ink (3.5) drains from it by
gravity and is not held by capillary action
EXAMPLE Some concrete samples and most woven fabrics.
3.4
smooth surface
surface that can be uniformly coated with Rz ink (3.5) using a close wound standard K-bar (3.6), number
3, which delivers a wet film thickness of 24 μm
3.5
Rz ink
resazurin-based ink used to assess the activity of a photocatalytic surface
3.6
K-bar
steel rod, close wound with wire of a defined gauge so as to deliver a wet ink film of a desired thickness,
as commonly used in the print industry
4 List of symbols, abbreviations and units
Designation Symbol or abbreviation Unit
Irradiation
...
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