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Ref. No. : ISO/R 788-1968 (E)
IS0
I N TERN AT I O N A L O R G A N IZATl ON FOR STAN DA RD l ZATl ON
IS0 RECOMMENDATION
R 788
ULTRAMARINE PlGM ENTS
1st EDITION
July 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 788, Ultramarine pigments, was drawn up by Technical
Committee ISO/TC 35, Paints, varnishes and related products and their raw materials, the Secretariat
of which is held by the Nederlands Normalisatie-Instituute ("1).
Work on this question by the Technical Committee began in 1955 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
L
In April 1967, this Draft IS0 Recommendation (No. 983) was circulated to all the IS0 Member
Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by the
foilowing Member Bodies :
Australia Italy Sweden
Denmark Netherlands Switzerland
France Turkey
New Zealand
Germany Portugal United Kingdom
India South Africa, Yugoslavia
Iran Rep. of
Israel Spain
One Member Body opposed the approval of the Draft :
Japan
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in July 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 788-1968 (I
IS0 Recommendation R 788 July 1968
ULTRAMARINE PIGMENTS
1. SCOPE
This IS0 Recommendation lays down the characteristics and methods of test of artificial ultramarine
pigments, usually delivered for use in the paint industry in the form of a powder.
2. DESCIUPTION
Ultramarine pigments. Mineral pigments characterized by the presence of metalloids such as sulphur,
incorporated in a complex of aluminium sodium silicates.
The material should be in the form of a soft dry powder or in such a condition that it may be readily
reduced thereto by crushing under a palette knife, without grinding action.
NOTE. - The presence of small quantities of extenders added to adjust the tinting strength is permitted.
3. CLASSIFICATION
The following categories of pigments are distinguished according to their maximum free sulphur
content :
- category A : 0.5 oh maximum free sulphur,
- category B : 0.1 maximum free sulphur.
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ISO/R 788-1968 (E)
4.
REQUIRED CHARACTERISTICS AND THEIR TOLERANCES
Ultramarine pigments should have the following characteristics :
Characteristics I Requirements I Test methods I
Min. 2.23
Relative density at 20 "C At present under study
Max. 2.40
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In accordance with that of an
See ISO/R 787, *
Colour
ag
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