ISO 1247-1-21st Aluminium Pigments for Paints – Part 1: General Aluminium Pigments

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ISO 1247-1-21st Aluminium Pigments for Paints – Part 1: General Aluminium Pigments

This document has been prepared by the ISO/TC 256 Technical Committee on Pigments, Dyes and Fillers.

The first version of ISO 1247-1, together with ISO 1247-2, cancelled and replaced the technically revised ISO 1247-1974. It also incorporates the amendment to ISO 1247-1974 /Amd 1:1982.

The main changes from the previous edition are as follows:

— An introduction is added, explaining the reason for the division;

– The addition of a third article, terms and definitions, and the inclusion of terms such as “non-volatile substances” and “masking power”;

– The distinction between surface treated and surface untreated aluminium pigments is introduced in articles 4 and 5;

— “Class” in paragraph 4.2 is deleted;

— Change “105°C volatile substance” to “non-volatile substance”;

— The original article 6 “Packaging” is deleted;

– Article 7, sampling, has been reduced to a reference to ISO 15528;

– In Table 1, requirements and test methods of “specific surface area of pigment”, “particle size distribution” and “hiding power” and corresponding test methods are added and renamed as “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.

— The original article 13 “unregulated blade force test” is deleted;

– Table 3, the test section, has been deleted;

— Article 16 was added to determine concealment force;

— The normative references have been updated, and the texts have been edited and revised.

A list of all the parts in the ISO 1247 series can be found on the ISO website.

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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. Aluminium pigments can be conveniently divided into two groups according to their form: general aluminium pigments produced during milling and vacuum metallized aluminium pigments (VMPS) (see ISO 1247-2). Because of the different technical requirements for aluminium pigments used in different fields, it is necessary to develop an international standard for each of these two groups.

To meet the needs of the marketing of aluminium pigments, this document describes the characteristics of “particle size distribution” and “hiding power” and their corresponding testing methods.

ISO 1247-1-21st Aluminium Pigments for Paints – Part 1: General Aluminium Pigments

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 in accordance with ISO 3251.

The previous edition (i.e. ISO 1247:1974) used different spectrophotometric methods for the determination of lead, iron and copper content, 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. 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 status 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 increasingly popular.

In order to use as few toxic agents as possible, this document uses 2-butoxy-ethyl alcohol or n-butyl acetate instead of acetone, which is now banned or restricted in many countries as a material that can be used in the manufacture of illicit drugs.

ISO 1247-1-21st Aluminium Pigments for Paints – Part 1: General Aluminium Pigments

1 range
This document specifies the requirements and corresponding test methods for aluminium pigments applicable to paint, including:

a) General, decorative and protective coatings, and

b) Special finishing coatings.

2 Normative references
The following files are referenced in the text in such a way that some or all of the content constitutes the requirements of this document. For dated references, citation-only versions apply. For undated references, the 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 – positive Philolin photometric method

ISO 795, aluminium and aluminium alloys — determination of copper content — oxalyl dihydrazine photometric method

– ISO 808, aluminium and aluminium alloys – determination of silicon – Spectrophotometric method using reduced silicon-molybdenum complexes

– 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 method

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 coloring materials according to their colour and chemical aspects

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

Mass residue obtained by evaporation under specified conditions

Note 1: In place of the term “non-volatile substance”, different terms such as solids, dry residues, dry matter, solid matter, baking residues are often used together with their respective abbreviations. The term “non-volatile substances”, which is also applicable in ISO 3251, should be used with the abbreviation “NV” instead of these terms.

[Source: ISO 4618:2014, 2.176]

3.2 Covering power

The ability of a tinting medium to hide the color or color difference of the substrate

[Source: ISO 18314-2:2015, 2.1.6]

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