introduction
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ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
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This document was prepared by the ISO/TC 256 Technical Committee on Pigments, Dyes and Fillers.
The first edition of ISO 1247-1, together with ISO 1247-2, eliminated and replaced the technically revised ISO 1247-1974. It also incorporates amendments to ISO 1247:1974 /Amd 1:1982.
The main changes from the previous edition are as follows:
– Added an introduction explaining the reasons for the division;
– The addition of article 3, terms and definitions, and the inclusion of terms such as “non-volatile substances” and “covering power”;
ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
– The distinction between surface treated and surface untreated aluminium pigments is introduced in articles 4 and 5;
– Deletion of the former paragraph 4.2 “classes”;
– “105°C volatile substances” to “non-volatile substances”;
– Delete the original article 6 “packaging”;
– Article 7, sampling, has been simplified to a reference to ISO 15528;
– Table 1 adds the requirements and test methods of “pigment specific surface area”, “particle size distribution” and “hiding power” and the corresponding test methods, and is renamed “Requirements and test methods”;
– The test method of “manganese” is deleted from the metal impurities in Table 1;
– Flame atomic absorption spectrometry was introduced to determine metal impurities;
– Delete the original article 13 “unregulated blade force test”;
– Table 3, the test section, has been deleted;
– Article 16 has been added to determine concealment forces;
– The normative references have been updated and the text has been edited and revised.
A list of all the components in the ISO 1247 series can be found on the ISO website.
Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at www.iso.org/members.html.
ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
introduce
Since the beginning of the new millennium, with advances in technology and product development, new aluminum pigments have flourished, and these aluminum pigments are used in a wide range of industrial sectors as heat or rust resistant coatings or colorants. Aluminum pigments can be conveniently divided into two groups according to their form: general aluminum pigments produced during milling and vacuum metallized aluminum pigments (VMP) (see ISO 1247-2). Because of the different technical requirements for aluminum pigments used in different fields, it is necessary to develop an international standard for each of these two groups.
In order to meet the needs of aluminum pigment marketing, this document describes the characteristics of “particle size distribution” and “hiding power” and their corresponding test methods.
In order to improve the safety of aluminium pigments, low flash point organic solvents and additives have been replaced by high flash point reagents, “105°C volatile substances” has been replaced by “non-volatile substances”, and test methods have been developed according to ISO 3251.
The previous edition (i.e. ISO 1247:1974) used different spectrophotometric methods for the determination of lead, iron and copper, and ethylenediamine tetraacetic acid (EDTA) titration for the determination of zinc. These methods are cumbersome to operate. The method used to determine lead involves the use of potassium cyanate, a highly toxic agent rarely used since the 1990s, and the method used to determine zinc is only suitable for samples with a total zinc content of 0.10% or more, and is not suitable for the current state of the aluminum pigment industry. While these old methods are retained in this document, flame atomic absorption spectrometry is introduced as a new option for the determination of the above-mentioned metal impurities. This method is faster, easier to operate, has a wider detection range, and is becoming more and more popular.
ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
In order to use as few toxic agents as possible, this document uses 2-butoxyethanol or n-butyl acetate instead of acetone, which is now banned or restricted in many countries as a material that may be used in the manufacture of illicit drugs.
1 Range
This document specifies the requirements and corresponding test methods for aluminium pigments suitable for paint, including:
a) General coatings, decorative coatings and protective coatings, and
b) Special finishing coatings.
2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.
ISO 385, laboratory glassware – burette
ISO 648, Laboratory glassware – Single volume pipettes
ISO 793, aluminium and aluminium alloys – determination of iron – Philolin photometric method
ISO 795, aluminium and aluminium alloys – Determination of copper content – oxalodihydrazide photometric method
ISO 808, aluminium and aluminium alloys – Determination of silicon – Spectrophotometric method using reduced silicon-molybdenum complexes
ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
ISO 1042, laboratory glassware – Single label volumetric bottles
ISO 1784, aluminium alloys – Determination of zinc – EDTA titration method
ISO 3696, analytical laboratory water – Specifications and test methods
ISO 9277, Determination of specific surface area of solids by gas adsorption – BET method
ISO 13320, particle size analysis – Laser diffraction methods
ISO 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling
ISO 18451-1, pigments, dyes and fillers – terminology – Part 1: General terminology
ISO 18451-2, pigments, dyes and fillers – terminology – Part 2: Classification of colouring materials according to their colour and chemical aspects
ISO 1247-1-21 Aluminium pigments for paints – Part 1: General aluminium pigments
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18451-1, ISO 18451-2 and the following articles apply.
3.1 Non-volatile substances
A mass residue obtained by evaporation under specific conditions
Note 1: Different terms in place of the term “non-volatile substance”, such as solids, dry residues, dry matter, solid substances, baking residues are often used together with their respective abbreviations. The term “non-volatile substances”, which also applies in ISO 3251, should be used together with the abbreviation “NV” instead of these terms.
[Source: ISO 4618:2014, 2.176]
3.2 Hiding power
The ability of a coloring medium to hide the color or chromatic aberration of a substrate
[Source: ISO 18314-2:2015, 2.1.6]
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