EN ISO 787-25:2006
(Main)General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO 787-25:1993)
General methods of test for pigments and extenders - Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO 787-25:1993)
The principle of the method specified is dispersing the test pigment and an agreed reference pigment in a particular test medium (mixture of an alkyd resin and fumed silica), preparing specimens on suitable substrates from the dispersions, measuring the tristimulus values of the specimens as described in ISO 7724-2, calculating the appropriate colour characteristics as described in ISO 7724-3.
Allgmeine Prüfverfahren für Pigmente und Füllstoffe - Teil 25: Vergleich der Farbe von Weiß-, Schwarz- und Buntpigmenten in Purton-Systemen - Farbmetrisches Verfahren (ISO 787-25:1993)
Dieser Teil von ISO 787 legt ein allgemeines Prüfverfahren zum farbmetrischen Vergleich der Farbe von Weiß-, Schwarz- und Buntpigmenten mit einem vereinbarten Bezugspigment in Purton-Systemen fest. Anmerkung 1: Wenn das in diesem Teil von ISO 787 festgelegte allgemeine Prüfverfahren für ein bestimmtes Pigment anwendbar ist, braucht in die Internationale Norm, die die Anforderungen an dieses Pigment enthält, nur ein Querverweis auf ISO 787-25 aufgenommen zu werden, mit einem Hinweis auf jede Abweichung, die im Hinblick auf die speziellen Eigenschaften des Produktes erforderlich ist.
Méthodes générales d'essai des pigments et matières de charge - Partie 25: Comparaison, dans les systèmes monopigmentaires, de la couleur des pigments blancs, noirs et colorés - Méthode colorimétrique (ISO 787-25:1993)
Splošne metode preskušanja pigmentov in polnil - 25. del: Primerjava barve (full-shade) belih, črnih in barvastih pigmentov Kolorimetrična metoda (ISO 787-25:1993)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2007
6SORãQHPHWRGHSUHVNXãDQMDSLJPHQWRYLQSROQLOGHO 3ULPHUMDYDEDUYH IXOO
VKDGH EHOLKþUQLKLQEDUYDVWLKSLJPHQWRY.RORULPHWULþQDPHWRGD ,62
General methods of test for pigments and extenders - Part 25: Comparison of the colour,
in full-shade systems, of white, black and coloured pigments - Colorimetric method (ISO
787-25:1993)
Allgmeine Prüfverfahren für Pigmente und Füllstoffe - Teil 25: Vergleich der Farbe von
Weiß-, Schwarz- und Buntpigmenten in Purton-Systemen - Farbmetrisches Verfahren
(ISO 787-25:1993)
Méthodes générales d'essai des pigments et matieres de charge - Partie 25:
Comparaison, dans les systemes monopigmentaires, de la couleur des pigments blancs,
noirs et colorés - Méthode colorimétrique (ISO 787-25:1993)
Ta slovenski standard je istoveten z: EN ISO 787-25:2006
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 787-25
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2006
ICS 87.060.10
English Version
General methods of test for pigments and extenders - Part 25:
Comparison of the colour, in full-shade systems, of white, black
and coloured pigments - Colorimetric method (ISO 787-25:1993)
Méthodes générales d'essai des pigments et matières de Allgmeine Prüfverfahren für Pigmente und Füllstoffe - Teil
charge - Partie 25: Comparaison, dans les systèmes 25: Vergleich der Farbe von Weiß-, Schwarz- und
monopigmentaires, de la couleur des pigments blancs, Buntpigmenten in Purton-Systemen - Farbmetrisches
noirs et colorés - Méthode colorimétrique (ISO 787- Verfahren (ISO 787-25:1993)
25:1993)
This European Standard was approved by CEN on 21 October 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 787-25:2006: E
worldwide for CEN national Members.
Foreword
The text of ISO 787-25:1993 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 787-25:2006 by 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 May 2007, and conflicting national standards
shall be withdrawn at the latest by May 2007.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
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.
Endorsement notice
The text of ISO 787-25:1993 has been approved by CEN as EN ISO 787-25:2006 without any
modifications.
INTERNATIONAL
IS0
STANDARD
787-25
First edition
1993-10-15
General methods of test for pigments and
extenders -
Part 25:
Comparison of the colour, in full-shade
systems, of white, black and coloured
pigments - Calorimetric method
M&hodes g&Wales d’essai des pigments et mat&es de charge -
Partie 25: Comparaison, dans /es s ystdmes monopigmentaires, de la
couleur des pigments blancs, noirs et color& - M&hode colorim&rique
Reference number
IS0 787--25:1993(E)
IS0 787=25:1993(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 787-25 was prepared by Technical Committee
lSO/TC 35, Paints and varnishes, Sub-Committee SC 2, Pigments and
extenders.
IS0 787 consists of the following parts, under the general title General
methods of test for pigments and extenders:
- Part 7: Comparison of colour of pigments
- Part 2: Determination of matter volatile at 105 ’ C
- Part 3: Determination of matter soluble in water - Hot extraction
method
- Part 4: Determination of acidity or alkalinity of the aqueous extract
- Part 5: Determination of oil absorption value
- Part 7: Determination of residue on sieve - Water method -
Manual procedure
- Part 8: Determination of matter soluble in water - Cold extraction
method
- Part 9: Determination of pH value of an aqueous suspension
0 IS0 1993
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronrc or mechanrcal, Including photocopyrng and mrcrofiim, wrtnout per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
Is0 787=25:1993(E)
- Part 10: Determination of density - Pyknometer method
- Part ? 7: Determination of tamped volume and apparent density after
tamping
- Part 13: Determination of water-soluble sulphates, chlorides and ni-
tra tes
- Part 74: Determination of resistivity of aqueous extract
- Part 15: Comparison of resistance to light of coloured pigments of
similar types
- Part 7 6: Determination of relative tinting strength (or equivalent col-
ouring value) and colour on reduction of coloured pigments - Visual
comparison method
- Part 17: Comparison of lightening power of white pigments
- Part 18: Determination of residue on sieve - Mechanical flushing
procedure
(Salicylic acid
- Part 19: Determination of water-soluble nitrates
method)
- Part 21: Comparison of heat stability of pigments using a stoving
medium
- Part 22: Comparison of resistance to bleeding of pigments
- Part 23: Determination of density (using a centrifuge to remove en-
trained air)
- Part 24: Determination of relative tinting strength of coloured pig-
ments and relative scattering power of white pigments - Photo-
metric methods
- Part 25: Comparison of the colour, in full-shade systems, of white,
black and coloured pigments - Calorimetric method
- Part 26: Determination of relative tinting strength and remaining
colour difference on reduction - Calorimetric method
14 and 17 are bound together as one document. Parts 6, 12 and
Parts 13,
20 have been withdrawn.
This page intentionally left blank
IS0 787-25: 1993(E)
INTERNATIONAL STANDARD
General methods of test for pigments and
extenders -
Part 25:
Comparison of the colour, in full-shade systems, of white,
black and coloured pigments - Calorimetric method
IS0 787-9: 1981, General methods of test for pig-
1 Scope
ments and extenders - Part 9: Determination of pH
value of an aqueous suspension.
This part of IS0 787 specifies a general test method
for comparing the colour, in full-shade systems, of
IS0 842:1984, Raw materials for paints and varnishes
white, black or coloured pigments with that of an
- Sampling.
agreed reference pigment, using a calorimetric pro-
cedure.
I SO 32 19: 1993, Plastics - Polymers/resins in the liq-
uid state or as emulsions or dispersions - De termi-
NOTE 1 When the general method specified in this part
nation of viscosity using a rotational viscome ter with
of IS0 787 is applicable to a given pigment, only a cross-
defined shear rate.
reference to IS0 787-25 needs to be included in the Inter-
national Standard giving the specification for that pigment,
indicating any detailed modification that may be needed in
IS0 3682:1983, Binders for paints and varnishes -
view of the special properties of the material in question.
Determination of acid value - Titrimetric method.
Only when the general method in this part of IS0 787 is not
applicable to a particular material is a different photometric
IS0 4629:1978, Paint media - Determination of
method for comparison of colour to be specified.
hydroxyl value - Titrime tric method.
IS0 787-l :I 982, General methods of test for pig-
IS0 7724-l :I 984, Paints and varnishes - Calorimetry
ments and extenders - Part 1: Comparison of co/our
- Part 1: Principles.
of pigments, describes a general test method for vis-
ual comparison of the colour of pigments.
IS0 7724-2:1984, Paints and varnishes - Colorimetry
- Part 2: Co/our measurement.
IS0 7724-3:1984, Paints and varnishes - Calorimetry
- Part 3: Calculation of co/our differences.
2 Normative references
IS0 8780-6:1990, Pigments and extenders - Meth-
ods of dispersion for assessment of dispersion
The following standards contain provisions which,
characteristics - Part 6: Dispersion using a triple-roll
through reference in this text, constitute provisions
m ill.
of this part of IS0 787. At the time of publication, the
editions indicated were valid. All standards are subject
ASTM D 16-l 991, Standard terminology relating to
to revision, and parties to agreements based on this
paint; varnish, lacquer and related products.
part of IS0 787 are encouraged to investigate the
possibility of applying the most recent editions of the
standards indicated below. Members of IEC and IS0
maintain registers of currently valid International
Standards.
IS0 787=25:1993(E)
trimethyloi propane, and shall comply with the fol-
ASTM D 387-l 986, Standard test method for co/or
and strength of color pigments with a mechanical lowing requirements:
m uller.
Test method
ASTM D 3022-1984, Standard test method for color
Acid value max. 15 mg IS0 3682
and strength of color pigments by use of a miniature
KOWg
sandmill.
Viscosity (of the 7 Pas to IS0 3219
product as deliv- 10 Pas
ered)
3 Definitions
30 mg to 50 mg IS0 4629
Hydroxyl value
KO H/g
For the purposes of this part of IS0 787, the following
definitions apply.
3.1 full-shade system: A pigmented system that
5.2 Fumed silica
contains one pigment only.
The fumed silica shall comply with the following re-
3.2 full-shade colour: The colour of a full-shade
quirements:
system that is applied in a hiding layer (optically infi-
nite). (See also note 3.)
Test method
Specific surface 175 m2/g to to be agreed be-
NOTE 2 Hiding cannot be achieved with some coloured
area (BET) 225 m2/g tween the inter-
pigments of very high transparency.
ested parties
pH value of a 3,6 to 4,5 IS0 787-9
3.3 mass tone: The colour of a full-shade system
4 % dispersion
that is not applied in a hiding layer, for example on a
in water
white test substrate. (See also notes 3 and 4.)
Fumed silica is necessary to avoid flocculation
NOTE 5
NOTES
and to control the flow properties of the pigmented system.
3 The definitions given in 3.2 and 3.3 are in conflict with
those in ASTM D 16 and with the usage of “mass color” in
ASTM D 387 and ASTM D 3022.
5.3 Preparation of the test medium
4 With pigmented systems, it is possible to produce a
number of different mass tones, depending on the thick- The preferred test medium (see tables 1 and 2 for
ness of the applied layer and the properties of the test
quantities) is prepared as follows:
substrate. Therefore, a mass tone is only clearly defined if
the preparation, the composition, the application technique
Mix well 97 parts by mass of alkyd resin (5.1) and 3
and the film thickness of the pigmented system as well as
parts by mass of fumed silica (5.2). Take care that no
the substrate are defined.
silica is lost by evolution of dust. Disperse the mixture
twice on a triple-roll mill (see IS0 8780-6).
4 Principle
Another test medium may be agreed between the
interested parties. This shall be indicated in the test
The test pigment and an agreed reference pigment
report.
are dispersed in a particular test medium, consisting
of a mixture of an alkyd resin and fumed silica, using
an automatic muller. From the dispersions of the two
Table ‘I - Recommended quantities of white
pigments, specimens on suitable substrates are pre-
pigment and test medium
pared. The tristimulus values of the specimens are
Volume of
measured as described in IS0 7724-2 and from these
Mass of
test
the appropriate colour characteristics (relative hue and
Pigment (Density)
pigment medium
amount of chromaticity difference for black and white
I I (5.3)
pigments; lightness, hue, chroma and total colour dif-
ml
g/ml
ference for coloured pigmer 7’ ts) are calculated as de-
scribed in IS0 7724-3.
Titanium dioxide (p = 4,0)
410 3,O
5 Materials
Zinc sulfide (p = 4,0)
5.1 Alkyd resin (binder
Zinc oxide (zinc white)
510 23
(p = 58)
The alkyd resin
...
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