EN ISO 7579:2009

Dyestuffs - Determination of solubility in organic solvents - Gravimetric and photometric methods (ISO 7579:2009)

ISO 7579:2009 specifies two methods for determining the solubility of dyestuffs in organic solvents. They are applicable to dyestuffs that do not change chemically under the influence of the solvent and are stable and non-volatile under the specified drying conditions. For volatile solvents (boiling point < 120 °C), the gravimetric procedure is recommended and, for less volatile solvents (boiling point > 120 °C), the photometric procedure is recommended. The choice of procedure should be made on a case-by-case basis.
The methods are suitable for concentrations between 1 g and 1 000 g of dyestuff per litre of solvent. Higher concentrations can be used provided the viscosity of the solution is such that the procedure can be carried out readily.
The methods are not suitable for the determination of insoluble matter in a dyestuff.

Farbstoffe - Bestimmung der Löslichkeit in organischen Lösemitteln - Gravimetrisches und photometrisches Verfahren (ISO 7579:2009)

Diese Internationale Norm legt zwei Verfahren zur Bestimmung der Löslichkeit von Farbstoffen in organischen Lösemitteln fest. Sie sind anwendbar auf Farbstoffe, die sich chemisch unter dem Einfluss des Lösemittels nicht verändern und unter den festgelegten Trocknungsbedingungen beständig und nicht flüchtig sind. Für niedrigsiedende Lösemittel ( 120 °C) wird ein gravimetrisches und für hochsiedende Lösemittel ( 120 °C) ein photometrisches Verfahren empfohlen. Die jeweilige Auswahl sollte problemspezifisch getroffen werden.
Die Verfahren sind vornehmlich für Konzentrationen zwischen 1 g und 1000 g Farbstoff je Liter Lösemittel geeignet. In Fällen höherer Konzentrationen muss die Prüflösung für die beschriebenen Verfahren geeignet sein.
Die Verfahren sind nicht für die Bestimmung unlöslicher Anteile in einem Farbstoff geeignet.

Colorants - Détermination de la solubilité dans les solvants organiques - Méthodes gravimétrique et photométrique (ISO 7579:2009)

L'ISO 7579:2009 spécifie deux méthodes de détermination de la solubilité des colorants dans les solvants organiques. Ces méthodes s'appliquent aux colorants qui ne changent pas chimiquement sous l'influence du solvant et qui sont stables et non volatils dans les conditions prescrites de séchage. La méthode gravimétrique est recommandée pour les solvants volatils (point d'ébullition inférieur à 120 °C), la méthode photométrique étant recommandée pour les solvants moins volatils (point d'ébullition supérieur à 120 °C). Le choix de la méthode appropriée se fait au cas par cas.
Ces méthodes conviennent pour des concentrations comprises entre 1 g et 1 000 g de colorant par litre de solvant. Des concentrations supérieures peuvent être utilisées pour autant que la viscosité des solutions d'essai soit telle que la méthode puisse être suivie telle quelle.
Les méthodes ne conviennent pas pour la détermination des matières insolubles dans un colorant.

Barvila - Ugotavljanje topnosti v organskih topilih - Gravimetrijska in fotometrijska metoda (ISO 7579:2009)

General Information

• Status: Published
• Publication Date: 14-Oct-2009
• Withdrawal Date: 29-Apr-2010
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: CEN/TC 298 - Pigments and extenders
• Drafting Committee: CEN/TC 298 - Pigments and extenders
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Oct-2009
• Due Date: 14-Mar-2011
• Completion Date: 15-Oct-2009
• Ref Project: SIST EN ISO 7579:2009 - Dyestuffs - Determination of solubility in organic solvents - Gravimetric and photometric methods (ISO 7579:2009)

Relations

• Replaces: EN ISO 7579:1996 - Dyestuffs - Determination of solubility in organic solvents - Gravimetric method (ISO 7579:1990)
• Effective Date: 17-Oct-2009

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2009
1DGRPHãþD
SIST EN ISO 7579:1997
Barvila - Ugotavljanje topnosti v organskih topilih - Gravimetrijska in fotometrijska
metoda (ISO 7579:2009)
Dyestuffs - Determination of solubility in organic solvents - Gravimetric and photometric
methods (ISO 7579:2009)
Farbstoffe - Bestimmung der Löslichkeit in organischen Lösemitteln - Gravimetrisches
und photometrisches Verfahren (ISO 7579:2009)
Colorants - Détermination de la solubilité dans les solvants organiques - Méthodes
gravimétrique et photométrique (ISO 7579:2009)
Ta slovenski standard je istoveten z: EN ISO 7579:2009
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
87.060.30 Topila Solvents
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 7579
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2009
ICS 87.060.10 Supersedes EN ISO 7579:1996
English Version
Dyestuffs - Determination of solubility in organic solvents -
Gravimetric and photometric methods (ISO 7579:2009)
Colorants - Détermination de la solubilité dans les solvants Farbstoffe - Bestimmung der Löslichkeit in organischen
organiques - Méthodes gravimétrique et photométrique Lösemitteln - Gravimetrisches und photometrisches
(ISO 7579:2009) Verfahren (ISO 7579:2009)
This European Standard was approved by CEN on 5 October 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7579:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 7579:2009) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with Technical Committee CEN/TC 298 “Pigments and extenders” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the
latest by April 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7579:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 7579:2009 has been approved by CEN as a EN ISO 7579:2009 without any modification.

INTERNATIONAL ISO
STANDARD 7579
Second edition
2009-10-15
Dyestuffs — Determination of solubility in
organic solvents — Gravimetric and
photometric methods
Colorants — Détermination de la solubilité dans les solvants
organiques — Méthodes gravimétrique et photométrique

Reference number
ISO 7579:2009(E)
©
ISO 2009
ISO 7579:2009(E)
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ii © ISO 2009 – All rights reserved

ISO 7579:2009(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Principle .1
5 Solvent.2
6 Apparatus.2
7 Sampling .2
8 Procedure.3
9 Test report.8
Annex A (normative) Solubility calculations.9

ISO 7579:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7579 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 2,
Pigments and extenders.
This second edition cancels and replaces the first edition (ISO 7579:1990), in which the mixing time has been
reduced from 24 h to 3 h but the temperature has been increased from 105 °C to 150 °C, Method B and
Annex B have been deleted and a photometric test method has been added.
iv © ISO 2009 – All rights reserved

ISO 7579:2009(E)
Introduction
Many dyestuffs are soluble in a solvent to an extent which is independent of the amount of dyestuff present in
the solvent, as long as excess dyestuff is present. This concentration is defined as the saturation
concentration and represents the solubility of the dyestuff in the solvent. In some cases, however, there is no
fixed saturation concentration and the amount of dyestuff which dissolves increases with the amount of
dyestuff added. A gravimetric and a photometric procedure to assess the solubility of these dyes are
described in this International Standard.

INTERNATIONAL STANDARD ISO 7579:2009(E)

Dyestuffs — Determination of solubility in organic solvents —
Gravimetric and photometric methods
1 Scope
This International Standard specifies two methods for determining the solubility of dyestuffs in organic
solvents. They are applicable to dyestuffs that do not change chemically under the influence of the solvent
and are stable and non-volatile under the specified drying conditions. For volatile solvents (boiling point
< 120 °C), the gravimetric procedure is recommended and, for less volatile solvents (boiling point > 120 °C),
the photometric procedure is recommended. The choice of procedure should be made on a case-by-case
basis.
The methods are suitable for concentrations between 1 g and 1 000 g of dyestuff per litre of solvent. Higher
concentrations can be used provided the viscosity of the solution is such that the procedure can be carried out
readily.
The methods are not suitable for the determination of insoluble matter in a dyestuff.
2 Normative references
The following referenced documents are indispensable for the application 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 787-2, General methods of test for pigments and extenders — Part 2: Determination of matter volatile at
105 °C
ISO 2811-1, Paints and varnishes — Determination of density — Part 1: Pyknometer method
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
solubility
maximum mass of a dyestuff that is soluble in a given volume of a particular solvent under specified
conditions
NOTE Solubility is expressed in grams per litre of solvent (see Annex A). No distinction is made between “true”
solubility and “colloidal” solubility.
4 Principle
Different amounts of the dyestuff are each dispersed in a defined volume of a solvent at 23 °C. After mixing
for 3 h, each dispersion is centrifuged and the solids content of the supernatant liquid is determined by either
gravimetric or photometric measurements.
ISO 7579:2009(E)
When using the gravimetric procedure, the amount of dyestuff which dissolves is assessed by determination
of the non-volatile-matter content of the solution.
When using the photometric procedure, the amount of dyestuff which dissolves is assessed by determination
of the light absorbance compared to that of a standard solution.
5 Solvent
When using the gravimetric procedure, the organic solvent used shall be completely volatile at a temperature
below the temperature of decomposition of the dyestuff. The density of the solvent at 23 °C shall be known.
The density of the solvent can be determined by the method described in ISO 2811-1 at 23 °C using a glass
pyknometer. The dyestuff shall not react chemically with the solvent.
As organic solvents are normally not chemically pure, the grade of purity (including the type and quantity of
any major secondary constituents) shall be given in the test report.
With solvents having a boiling point above 120 °C, the photometric method is recommended.
6 Apparatus
Ordinary laboratory apparatus and glassware, together with the follow
...