SIST ISO 4630:1998

SLOVENSKI STANDARD
SIST ISO 4630:1998
01-maj-1998
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Binders for paints and varnishes -- Estimation of colour of clear liquids by the Gardner
colour scale
Liants pour peintures et vernis -- Évaluation de la couleur des liquides non opaques au
moyen de l'échelle Gardner
Ta slovenski standard je istoveten z: ISO 4630:1997
ICS:
87.060.20 Veziva Binders
SIST ISO 4630:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 4630:1998

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SIST ISO 4630:1998
INTERNATIONAL
IS0
STANDARD
4630
Second edition
1997-05- 15
Binders for paints and varnishes -
Estimation of colour of clear liquids
by the Gardner colour scale
hiants pour peintures et vernis - l%aluation de la couleur des liquides non
opaques au moyen de I’&helle Gardner
Reference number
IS0 4630:1997(E)

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SIST ISO 4630:1998
IS0 4630:1997(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 Ynternational
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 4630 was prepared by Technical Committee
ISOnC 35, Paints and varnishes, Subcommittee SC IO, Test methods for
binders for paints and varnishes.
This second edition cancels and replaces the first edition (IS0 4630:1981),
which has been technically revised. The main change it that liquid
standards are now used as reference standards rather than the glass
standards used previously.
Annexes A and B form an integral part of this International Standard.
0 IS0 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @ iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST ISO 4630:1998
INTERNATIONAL STANDARD @ IS0 IS0 4630: 1997(E)
Binders for paints and varnishes - Estimation of colour of
clear liquids by the Gardner colour scale
1 Scope
This International Standard specifies a method for estimating, by means of the Gardner colour scale, the colour of
clear liquids used as binders for paints and varnishes.
It is applicable to drying oils, varnishes and solutions of fatty acids, polymerized fatty acids and resins. Its
applicability to other materials has not been estalished.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard 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 842: 1984, Raw materials for paints and varnishes - Sampling.
- Specifications and test methods.
IS0 3696: 1987, Water for analytical laboratory use
CIE Publication No. 15.2, Colorimety.
3 Principle
The colour of a sample of the product under examination is viewed in a glass tube of standard diameter and visually
compared with the colours of arbitrarily numbered colour standards. The standard that most closely matches the
colour of the test sample is identified and the result is expressed in terms of a number on the Gardner colour scale.
4 Apparatus and materials
4.1 Gardner colour standards
4.1 .l Reference standards
Eighteen liquid standards having chromaticity coordinates and luminous transmittances as specified in table 1 are
required as reference standards for calibration.
Before being used, liquid standards shall be checked by the method specified in annex A.
Colour standards that do not conform to the requirements in table 1 shall be rejected.

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SIST ISO 4630:1998
IS0 4630: 1997(E) @ IS0
4.1.2 Working standards
Used as working standards are 18 glass or liquid standards having chromaticity coordinates that differ from those of
reference standards by not more than one-third of the difference in x or y (see table 1) between adjacent reference
standards.
In any one set of working standards, no two standards shall be closer together than two-thirds of the difference in x
or y between the corresponding reference standards.
The luminous transmittance shall be as specified in table 1.
In case of dispute, only reference standards shall be used.
The standards shall be mounted in such a way that they can be conveniently handled and allow simultaneous
viewing of two adjacent standards in the colour comparator (4.3).
- coloured solutions contained in glass tubes (4.2) - the reference
When using liquid working standards
standards described in 4.1 .I can be used directly.
When glass working standards are used, they shall be checked against liquid reference standards. If the deviation
is greater than that specified in the second paragraph of this subclause, change the number of the glass standard to
correspond to the number of the nearest reference standard.
NOTE 1 The chromaticity coordinates of glass standards and liquid standards differ slightly. However, the difference does not
affect the accuracy of the estimation.
Potassium hexachloroplatinate solutions are used for the lighter standards (1 to 8), and solutions of iron(lll) chloride
and cobalt(H) chloride in hydrochloric acid are used for the darker standards (9 to 18).
The compositions of the liquid standards are specified in annex B.
Table 1 - Colour specifications for reference standards
Chromaticity coordinates Luminous Tolerance on
Gardner colour
transmittance, Y transmittance
standard number
x % (k) %
Y
L
1 0,317 7 0,330 3 80 7
0,323 3 0,335 2 79 7
2
I I I I I I
0,345 2 76
3 0,332 9 6
I I I I I I
0,343 7 0,364 4 75 5
4
I I I I I I
0,384 0 74 4
5 0,355 8
I I I I I I
0,376 7 0,406 1 71 4
6
I I I I I I
0,435 2 67 4
7 0,404 4
I I I I I
0,420 7 0,449 8 64 4
8
0,464 0 61 4
9 0,434 3
0,476 0
IO 0,450 3 57 4
I I I I I I
11 0,484 2 0,481 8 45 4
12 0,507 7 0,463 8 36 5
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