ISO 19810:2023

ISO TC 206/SC/FDIS 19810:2023(E)
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ISO 19810:2023(E)
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ISO TC 206/SC /WG 9
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Secretariat: JISC
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Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for
self-cleaning performance of semiconducting photocatalytic materials under indoor
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lighting environment — Measurement of water contact angle
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Copyright notice
This
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ISO /FDIS 19810:2023(E)
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© ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
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permitted under 2023
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2ii © ISO 2017 2023 – All rights reserved

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ISO /FDIS 19810:2023(E)
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Contents Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Test apparatus . 4
5.1 Instruments and apparatus . 4
5.2 Reagents . 4
5.3 Laboratory temperature and humidity . 4
6 Test piece preparation . 4
7 Test procedures . 5
7.1 Measurement of water contact angle . 5
7.2 Test piece pretreatment . 5
7.3 Visible light irradiation and measurement of contact angle after n h of visible light
irradiation, θ4(n) . 6
8 Calculation of test results. 8
8.1 Guide to the rounding of numbers . 8
8.2 Calculation of contact angle . 8
8.3 Conditions for a valid test . 9
8.4 Initial contact angle halving time, n . 9
1/2
8.5 Contact angle reduction time, n10° . 9
9 Reporting of test results . 10
10 Test measurement examples . 11
Bibliography . 13


Foreword . 5
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
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5 Test apparatus . 4
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5.1 Instruments and apparatus . 4
5.2 Reagents . 4
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5.3 Laboratory temperature and humidity . 4
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6 Test piece preparation . 4 Formatted Table
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7 Test procedures . 5
7.1 Measurement of water contact angle . 5
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© ISO 2017 2023 – All rights reserved 3iii

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ISO /FDIS 19810:2023(E)
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7.2 Test piece pretreatment . 5
7.3 Visible light irradiation and measurement of contact angle after n h of visible light
irradiation, θ (n) . 6
4
7.3.1 Measurement of illuminance and preparation of test piece placement location . 6
7.3.2 Measurement of contact angle after n h of visible light irradiation, θ (n) . 6
4
8 Calculation of test results . 9
8.1 Guide to the rounding of numbers . 9
8.2 Calculation of contact angle . 9
8.3 Conditions for a valid test . 9
8.4 Initial contact angle halving time, n . 9
1/2
8.5 Contact angle reduction time, n . 10
10°
9 Reporting of test results . 10
10 Test measurement examples . 11
Bibliography . 13

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ISO /FDIS 19810:2023(E)
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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 documentsdocument 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).www.iso.org/directives).
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of
this document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the
evidence, validity or applicability of any claimed patent rights. in respect thereof. As of the date of
publication of this document, ISO had not received notice of (a) patent(s) which may be required to
implement this document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at  www.iso.org/patents. ISO
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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.
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For an explanation onof the voluntary nature of standards, the meaning of ISO specific terms and
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expressions related to conformity assessment, as well as information about ISO's adherence to the
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This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.
stops: 19.85 pt, Left + 39.7 pt, Left + 59.55 pt, Left +
79.4 pt, Left + 99.25 pt, Left + 119.05 pt, Left + 138.9
This second edition cancels and replaces the first edition (ISO 19810:2017), of which it constitutes a
pt, Left + 158.75 pt, Left + 178.6 pt, Left + 198.45 pt,
minor revision. The changes are as follows:
Left
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— definitions of 3.1, 3.2 and 3.4 corrected;
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— minor editorial changes.
between Latin and Asian text, Adjust space between
Asian text and numbers
Any feedback or questions on this document should be directed to the user’s national standards body. A
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complete listing of these bodies can be found at
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© ISO 2017 2023 – All rights reserved 5v

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FINAL DRAFT INTERNATIONAL STANDARD ISO /FDIS 19810:20172023(E)
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Fine ceramics (advanced ceramics, advanced technical
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ceramics) — Test method for self-cleaning performance of
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semiconducting photocatalytic materials under indoor lighting
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environment — Measurement of water contact angle
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1 Scope
This document specifies a test method for the determination of the self-cleaning performance of sheet-
form materials that contain an indoor-light-active photocatalyst or have indoor-light-active
photocatalytic films on the surface, under indoor lighting environment.
This method is used to measure the change of water contact angle under indoor lighting environment,
which is one of the indices reflecting the self-cleaning performance of semiconducting photocatalytic
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materials.
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This document is not applicable to permeable materials on which water droplets cannot hold and rough
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materials which obscure water droplets. This document is not applicable to materials of which the
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changes in the water contact angle due to decomposition of adhered organic matter cannot be evaluated
because even if the surface is clean, the water contact angle is remarkably large or the water contact
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angle cannot be sufficiently increased by attaching organic matter to the surface.
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2 Normative references
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The following documents are referred to in the text in such a way that some or all of their content
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constitutes requirements of this document. For dated references, only the edition cited applies. For
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undated references, the latest edition of the referenced document (including any amendments) applies.
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ISO 10677, Fine ceramics (advanced ceramics, advanced technical ceramics) — Ultraviolet light source
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for testing semiconducting photocatalytic materials
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ISO 14605, Fine ceramics (advanced ceramics, advanced technical ceramics) — Light source for testing
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semiconducting photocatalytic materials used under indoor lighting environment
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ISO 27448, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for self-
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cleaning performance of semiconducting photocatalytic materials  — Measurement of water contact
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angle
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3 Terms and definitions
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For the purposes of this document, the terms and definitions given in ISO 27448 and the following
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apply.
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ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
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addresses:
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— IEC Electropedia: available at http://www.electropedia.org/
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© ISO 2017 2023 – All rights reserved 11

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ISO/FDIS 19810:2023(E)
— ISO Online browsing platform: available at http://www.iso.org/obphttps://www.iso.org/obp
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— IEC Electropedia: available at https://www.electropedia.org/
3.1
photocatalyst
substance that performs one or more catalytic functions based on oxidation or reduction reactions
under photoirradiation
Note 1 to entry: The functions include decomposition and removal of air and water contaminants, deodorization,
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antibacterial, self-cleaning and antifogging actions. A photocatalyst can also be used for light energy conversion.
Left + 59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left +
119.05 pt, Left + 138.9 pt, Left + 158.75 pt, Left +
[SOURCE: ISO 20507:2022, 3.1.62]
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3.2
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photocatalytic materials
material in which or on which the photocatalyst is added by coating, impregnation or mixing
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Note 1 to entry: Materials include ceramic, metal, plastic, paper and cloth for general purposes.
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3.3
semiconducting photocatalyst
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substance that displays photocatalytic action based on its electronic band structure
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Note 1 to entry: This applies to metal oxides like titanium dioxide, and sulphides. Photocatalysts which are not
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semiconducting includes metal complexes.
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self-cleaning effect
pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt,
maintenance of surface cleanliness of a material by employing a photocatalyst loaded onto the surface
Left + 198.45 pt, Left
Note 1 to entry: Self-cleaning using photocatalysis is achieved through decomposition of surface contaminants by
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oxidation and reduction reactions, and/or hydrophilicity that allows stains or dirt to be easily removed by the
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flow of (rain)water over the surface.
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Left + 198.45 pt, Left
Note 2 entry: Examples include glass, tiling and other facings for buildings, and plastics and coatings for general
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purposes.
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3.5
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indoor lighting environment
indoor lighting environment with an artificial light source for general lighting service that does not
include sunlight
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59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left + 119.05
Note 1 to entry: For the purposes of photocatalytic activity characterization, a clear definition of spectral range
pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt,
and intensity is normally required.
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3.6
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indoor-light-active photocatalyst
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substance that carries out many functions based on oxidization and reduction reactions produced by an
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artificial light source for general lighting service, including decomposition and removal of air and water
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contaminants, deodorization, and antibacterial, antifungal, self-cleaning and antifogging actions
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3.7
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contact angle before pretreatment
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ISO/FDIS 19810:2023(E)
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θ1
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water contact angle before pretreatment by UV irradiation and coating with organic matter
3.8
contact angle after UV irradiation and before coating

θ2
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water contact angle after pretreatment by UV irradiation and before coating with organic matter
3.9
initial contact angle
θ
3
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water contact angle after pretreatment by UV irradiation and coating with organic matter and
immediately before starting visible light irradiation (water contact angle after 0 h of visible light
irradiation)
3.10
contact angle after n h of visible light irradiation
θ (n)
4 Formatted: Font: Bold
water contact angle after applying visible light irradiation for n h
Note 1 to entry: The unit of time may also be in days, minutes, and seconds in addition to hours.
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59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left + 119.05
3.11
pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt,
initial contact angle halving time Left + 198.45 pt, Left
n
1/2
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time required for water contact angle to reach half the value of the initial contact angle θ due to visible
3
light irradiation
3.12
contact angle reduction time (10°)
n
10°
time required for water contact angle to reach 10° due to visible light irradiation
3.13
test piece set
multiple test pieces of the same material, treated under the same conditions, to investigate time-series
changes in a water contact angle by sequential measurement under identical visible light irradiation
conditions
4 Principle
This test method measures the time until a water contact angle increased by attaching organic matter to
a test piece is reduced due to decomposition of the organic matter by the photocatalytic effect of visible
light irradiation, thus provides an index of the self-cleaning effect performance of an indoor-light-active
photocatalytic material. First, the test piece is irradiated with UV light to remove any organic matter
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adsorbed to its surface, and organic matter for test purposes (stearic acid) is then applied to the test
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piece by a previously established method. Next, the initial contact angle is measured, and the test piece
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is then irradiated with a given amount of visible light. The time-series changes in the contact angle due
to visible light irradiation are measured, and the elapsed time from the start of visible light irradiation
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until the contact angle reaches half of the initial value and until the contact angle reaches 10° or lower
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are determined.
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© ISO 2017 2023 – All rights reserved 33

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ISO/FDIS 19810:2023(E)
5 Test apparatus
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5.1 Instruments and apparatus Asian text, Don't adjust space between Asian text and
numbers, Tab stops: 20 pt, Left
5.1.1 Black light blue fluorescent lamp, as specified byin accordance with ISO 10677.
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NOTE In general, the lamp recommended for use is an ultraviolet fluorescent lamp which produces
ultraviolet rays termed UVA and has a peak emission at 351 nm, employing blue glass which absorbs
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visible light.
59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left + 119.05
pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt,
5.1.2 Ultraviolet light irradiation apparatus, as specified byin accordance with ISO 27448.
Left + 198.45 pt, Left
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5.1.3 Ultraviolet light radiometer, as specified byin accordance with ISO 10677.
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5.1.4 Visible light source (fluorescent lamp and UV cut filter).
Asian text, Adjust space between Asian text and
numbers
Indoor illumination environment condition (Condition A) shall be used with a cool white halophosphate
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fluorescent lamp and a UV sharp cut filter designated as Type A from among those specified by
59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left + 119.05
ISO 14605, with an attached cover which transmits light longer than wavelengths of 400 nm.
pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt,
Fluorescent lamps shall be warmed up for 15 min before use to stabilize output.
Left + 198.45 pt, Left
5.1.5 Visible light irradiating apparatus.
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To ensure uniform irradiation of test piece sets by light produced by the lamp, allow for blocking of light
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from surroundings, and allow for adjustment of illuminance, the test piece or the position of the lamp
shall be movable. If a lamp reflector is attached, it shall employ a material with little absorption of
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visible light and degradation under visible light conditions and the structure shall allow for
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measurement of illuminance where the test piece is located. Illuminance at the test piece surface shall
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be adjustable over a threefold or greater range.
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5.1.6 Illuminometer, as specified byin accordance with ISO 14605.
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5.1.7 Contact angle measurement apparatus, as specified byin accordance with ISO 27448.
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5.2 Reagents .
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5.2.1 Stearic acid, of assay (cGC) 60,0 % or higher.
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5.2.2 n-Heptane, of assay (cGC) 99,0 % or higher. Formatted: std_docNumber
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5.2.3 Water, distilled water or wate
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19810
ISO/TC 206
Fine ceramics (advanced ceramics,
Secretariat: JISC
advanced technical ceramics) — Test
Voting begins on:
2023-04-12 method for self-cleaning performance
of semiconducting photocatalytic
Voting terminates on:
2023-06-07
materials under indoor lighting
environment — Measurement of water
contact angle
Céramiques techniques — Méthode d'essai relative aux propriétés
autonettoyantes des matériaux photocatalytiques semiconducteurs
dans un environnement d'éclairage intérieur — Mesurage de l'angle
de contact de l'eau
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 19810:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19810
ISO/TC 206
Fine ceramics (advanced ceramics,
Secretariat: JISC
advanced technical ceramics) — Test
Voting begins on:
method for self-cleaning performance
of semiconducting photocatalytic
Voting terminates on:
materials under indoor lighting
environment — Measurement of water
contact angle
Céramiques techniques — Méthode d'essai relative aux propriétés
autonettoyantes des matériaux photocatalytiques semiconducteurs
dans un environnement d'éclairage intérieur — Mesurage de l'angle
de contact de l'eau
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 19810:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 19810:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Test apparatus .3
5.1 Instruments and apparatus . 3
5.2 Reagents . 4
5.3 Laboratory temperature and humidity . 4
6 Test piece preparation .4
7 Test procedures . 5
7.1 Measurement of water contact angle . 5
7.2 Test piece pretreatment . 5
7.3 Visible light irradiation and measurement of contact angle after n h of visible light
irradiation, θ (n) . 6
4
7.3.1 Measurement of illuminance and preparation of test piece placement
location . . 6
7.3.2 Measurement of contact angle after n h of visible light irradiation, θ (n) . 6
4
8 Calculation of test results . 8
8.1 Guide to the rounding of numbers . 8
8.2 Calculation of contact angle . 8
8.3 Conditions for a valid test . 9
8.4 Initial contact angle halving time, n . 9
1/2
8.5 Contact angle reduction time, n . 10
10°
9 Reporting of test results .10
10 Test measurement examples .11
Bibliography .12
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ISO/FDIS 19810:2023(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 non­governmental, 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at  www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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.
This second edition cancels and replaces the first edition (ISO 19810:2017), of which it constitutes a
minor revision. The changes are as follows:
— definitions of 3.1, 3.2 and 3.4 corrected;
— minor editorial changes.
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.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 19810:2023(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for self-cleaning performance
of semiconducting photocatalytic materials under indoor
lighting environment — Measurement of water contact
angle
1 Scope
This document specifies a test method for the determination of the self-cleaning performance of
sheet-form materials that contain an indoor-light-active photocatalyst or have indoor-light-active
photocatalytic films on the surface, under indoor lighting environment.
This method is used to measure the change of water contact angle under indoor lighting environment,
which is one of the indices reflecting the self-cleaning performance of semiconducting photocatalytic
materials.
This document is not applicable to permeable materials on which water droplets cannot hold and rough
materials which obscure water droplets. This document is not applicable to materials of which the
changes in the water contact angle due to decomposition of adhered organic matter cannot be evaluated
because even if the surface is clean, the water contact angle is remarkably large or the water contact
angle cannot be sufficiently increased by attaching organic matter to the surface.
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
ISO 14605, Fine ceramics (advanced ceramics, advanced technical ceramics) — Light source for testing
semiconducting photocatalytic materials used under indoor lighting environment
ISO 27448, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for self-
cleaning performance of semiconducting photocatalytic materials — Measurement of water contact angle
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 27448 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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ISO/FDIS 19810:2023(E)
3.1
photocatalyst
substance that performs one or more catalytic functions based on oxidation or reduction reactions
under photoirradiation
Note 1 to entry: The functions include decomposition and removal of air and water contaminants, deodorization,
antibacterial, self-cleaning and antifogging actions. A photocatalyst can also be used for light energy conversion.
[SOURCE: ISO 20507:2022, 3.1.62]
3.2
photocatalytic materials
material in which or on which the photocatalyst is added by coating, impregnation or mixing
Note 1 to entry: Materials include ceramic, metal, plastic, paper and cloth for general purposes.
3.3
semiconducting photocatalyst
substance that displays photocatalytic action based on its electronic band structure
Note 1 to entry: This applies to metal oxides like titanium dioxide, and sulphides. Photocatalysts which are not
semiconducting includes metal complexes.
3.4
self-cleaning effect
maintenance of surface cleanliness of a material by employing a photocatalyst loaded onto the surface
Note 1 to entry: Self-cleaning using photocatalysis is achieved through decomposition of surface contaminants
by oxidation and reduction reactions, and/or hydrophilicity that allows stains or dirt to be easily removed by the
flow of (rain)water over the surface.
Note 2 to entry: Examples include glass, tiling and other facings for buildings, and plastics and coatings for
general purposes.
3.5
indoor lighting environment
indoor lighting environment with an artificial light source for general lighting service that does not
include sunlight
Note 1 to entry: For the purposes of photocatalytic activity characterization, a clear definition of spectral range
and intensity is normally required.
3.6
indoor-light-active photocatalyst
substance that carries out many functions based on oxidization and reduction reactions produced by
an artificial light source for general lighting service, including decomposition and removal of air and
water contaminants, deodorization, and antibacterial, antifungal, self­cleaning and antifogging actions
3.7
contact angle before pretreatment
θ
1
water contact angle before pretreatment by UV irradiation and coating with organic matter
3.8
contact angle after UV irradiation and before coating
θ
2
water contact angle after pretreatment by UV irradiation and before coating with organic matter
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ISO/FDIS 19810:2023(E)
3.9
initial contact angle
θ
3
water contact angle after pretreatment by UV irradiation and coating with organic matter and
immediately before starting visible light irradiation (water contact angle after 0 h of visible light
irradiation)
3.10
contact angle after n h of visible light irradiation
θ (n)
4
water contact angle after applying visible light irradiation for n h
Note 1 to entry: The unit of time may also be in days, minutes, and seconds in addition to hours.
3.11
initial contact angle halving time
n
1/2
time required for water contact angle to reach half the value of the initial contact angle θ due to visible
3
light irradiation
3.12
contact angle reduction time (10°)
n
10°
time required for water contact angle to reach 10° due to visible light irradiation
3.13
test piece set
multiple test pieces of the same material, treated under the same conditions, to investigate time­series
changes in a water contact angle by sequential measurement under identical visible light irradiation
conditions
4 Principle
This test method measures the time until a water contact angle increased by attaching organic matter to
a test piece is reduced due to decomposition of the organic matter by the photocatalytic effect of visible
light irradiation, thus provides an index of the self-cleaning effect performance of an indoor-light-active
photocatalytic material. First, the test piece is irradiated with UV light to remove any organic matter
adsorbed to its surface, and organic matter for test purposes (stearic acid) is then applied to the test
piece by a previously established method. Next, the initial contact angle is measured, and the test piece
is then irradiated with a given amount of visible light. The time­series changes in the contact angle due
to visible light irradiation are measured, and the elapsed time from the start of visible light irradiation
until the contact angle reaches half of the initial value and until the contact angle reaches 10° or lower
are determined.
5 Test apparatus
5.1 Instruments and apparatus
5.1.1 Black light blue fluorescent lamp, in accordance with ISO 10677.
In general, the lamp recommended for use is an ultraviolet fluorescent lamp which produces ultraviolet
rays termed UVA and has a peak emission at 351 nm, employing blue glass which absorbs visible light.
5.1.2 Ultraviolet light irradiation apparatus, in accordance with ISO 27448.
5.1.3 Ultraviolet light radiometer, in accordance with ISO 10677.
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ISO/FDIS 19810:2023(E)
5.1.4 Visible light source (fluorescent lamp and UV cut filter).
Indoor illumination environment condition (Condition A) shall be used with a cool white halophosphate
fluorescent lamp and a UV sharp cut filter designated as Type A from among th
...