EN ISO 15715:2025
(Main)Binders for paints and varnishes - Determination of turbidity (ISO 15715:2025)
Binders for paints and varnishes - Determination of turbidity (ISO 15715:2025)
This document specifies an instrumental method for determining the turbidity of clear liquids. It is applicable to resins and resin solutions, solvents, clear coating materials, monomers and any other liquids where clarity is specified.
Bindemittel für Beschichtungsstoffe - Bestimmung der Trübung (ISO 15715:2024)
Liants pour peintures et vernis - Détermination de la turbidité (ISO 15715:2025)
L'ISO 15715:2003 spécifie une méthode instrumentale pour la détermination de la turbidité de liquides clairs. Elle s'applique aux résines et aux solutions de résine, aux solvants, aux revêtements transparents, aux monomères et à tout autre liquide dont la transparence est spécifiée.
Veziva za barve in lake - Določanje motnosti (ISO/DIS 15715:2024)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2024
Veziva za barve in lake - Določanje motnosti (ISO/DIS 15715:2024)
Binders for paints and varnishes - Determination of turbidity (ISO/DIS 15715:2024)
Bindemittel für Beschichtungsstoffe - Bestimmung der Trübung (ISO/DIS 15715:2024)
Liants pour peintures et vernis - Détermination de la turbidité (ISO/DIS 15715:2024)
Ta slovenski standard je istoveten z: prEN ISO 15715
ICS:
87.060.20 Veziva Binders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 15715
ISO/TC 35
Binders for paints and varnishes —
Secretariat: NEN
Determination of turbidity
Voting begins on:
Liants pour peintures et vernis — Détermination de la turbidité
2024-09-12
Voting terminates on:
ICS: 87.060.20
2024-12-05
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 15715:2024(en)
DRAFT
ISO/DIS 15715:2024(en)
International
Standard
ISO/DIS 15715
ISO/TC 35
Binders for paints and varnishes —
Secretariat: NEN
Determination of turbidity
Voting begins on:
Liants pour peintures et vernis — Détermination de la turbidité
ICS: 87.060.20 Voting terminates on:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 15715:2024(en)
ii
ISO/DIS 15715:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
4.1 Principle of the method .1
4.2 General principles of turbidity measurement .2
5 Apparatus . 2
5.1 Turbidimeter.2
5.2 Measurement cells . . .3
6 Calibration . 3
7 Procedure . 3
8 Expression of results . 4
9 Precision . 4
10 Test report . 4
Annex A (normative) Preparation of formazin standards . 5
Annex B (informative) Use of additional measurement angles . 6
Bibliography . 7
iii
ISO/DIS 15715:2024(en)
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).
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 35, Paints and varnishes in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 15715:2003), which has been technically
revised.
The main changes are as follows:
— Clause 2 has been added;
— the principle (new 4.1) has been amended by a description of influences which can affect turbidity
measurements;
— formazin turbidity units (FTU) has been changed to formazin nephelometric units (FNU), to be in line
with the actual edition of ISO 7027-1;
— the optical path length of the tube has been changed in 4.2;
— in Clause 6 a reference to commercially available calibration standards has been added as well as a
reference to room temperature for storing the calibration standards;
— a reference to ISO 7027-1 has been added for precision;
— the expression of results in Clause 8 has been reduced to three classes, i.e. the former classes 10 FNU to
less than 100 FNU and greater or equal to 100 FNU have been combined to one class, to report the result
to the nearest 1 FNU;
— the normative references have been updated.
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
DRAFT International Standard ISO/DIS 15715:2024(en)
Binders for paints and varnishes — Determination of
turbidity
1 Scope
This document specifies an instrumental method for determining the turbidity of clear liquids. It is
applicable to resins and resin solutions, solvents, clear coating materials, monomers and any other liquids
where clarity is specified.
The measurement of the turbidity of liquids can be carried out visually or by instrument, but visual methods
can be subjective. This method measures instrumentally the scattering of light by the insoluble matter in a
liquid and therefore gives an objective determination of turbidity.
Turbidity in liquids is caused by the presence of undissolved matter (i.e. non-settling flocculation, gels or
other suspended matter such as particles or droplets). In the case of finely dispersed undissolved matter, the
turbidity may be determined by measuring the intensity of the light which is scattered by the particles when
a beam of light is passed through the liquid.
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 4618, Paints and varnishes — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 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/
3.1
turbidity
reduction in the transparency of a liquid caused by the presence of undissolved matter
4 Principle
4.1 Principle of the method
A liquid sample is placed in an optical cell or glass tube and the turbidity measured on a ratio-recording
turbidimeter. The instrument is calibrated in formazin nephelometric units (FNU). The turbidity of the
sample can thus be read directly in FNU. The readings are therefore insensitive to colour.
Measurements of turbidity can be affected by the presence of dissolved light-absorbing substances
(substances imparting colour). Such effects can be minimized, however, by performing measurements at
wavelengths greater than 800 nm. Only carbon black and a blue colour, which can be found in certain polluted
waters, slightly affects measurements of turbidity in this region of the spectrum. Air bubbles can also
ISO/DIS 15715:2024(en)
interfere with measurements, but such interference can be minimized by careful handling of the samples.
It is to be investigated whether and to what extent, particular problems will require the specification of
additional marginal conditions.
4.2 General principles of turbidity measurement
A liquid sample coloured by dissolved substances is a homogeneous system that only attenuates radiation
passing through the sample. A sample containing undissolved substances not only attenu
...
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