ISO 3549-1995 “Zinc powder pigments for coatings – Specifications and test methods”

introduction
ISO (International Organization for Standardization) is a global federation of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member group interested in a subject for which a technical committee has been established has the right to be represented on the Committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by a vote of at least 75% of the member bodies.

The international standard ISO 3549 was developed by the Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 2, Pigments and increments.

The second edition cancels and replaces the first edition (ISO 3549:1976), which has been technically revised.

1 Scope of Application
This international standard specifies the requirements and corresponding test methods for zinc powder pigments suitable for protective coatings.

ISO 3549-1995 “Zinc powder pigments for coatings – Specifications and test methods”

2 Normative reference documents

The following standards contain provisions which, by reference in this standard, constitute provisions of this International Standard. At the time of publication, the version shown is valid. All standards are subject to revision and parties to an agreement based on this international Standard are encouraged to explore the possibility of applying new versions of the following standards. IEC and ISO members maintain a register of currently valid international standards.

ISO 565:1990, test screens – wire cloths, perforated metal sheets and electroforming sheets – Nominal dimensions of openings.

ISO 594-1:1986, tapered joints of 6% taper (ruhr) for use in syringes, needles and certain other medical devices – Part 1: General requirements.

ISO 842:1984, Raw materials for paints and varnishes – Sampling.

ISO 3696:1987, Analytical laboratory water use – Specifications and test methods.

ISO 3549-1995 “Zinc powder pigments for coatings – Specifications and test methods”

3 Definition
For the purposes of this International Standard, the following definitions apply.

3.1 Zinc powder pigment

A fine gray powder of basically spherical particles, composed mainly of metallic zinc.

Note 1: Zinc powder pigments for coatings may vary in metal zinc content, chemical purity, particle shape, particle size distribution, average and maximum diameter, etc. These changes can affect the behavior of zinc powder in the coating coating parameters such as dispersity, grinding fineness, reactivity, electrical conductivity and filling properties.

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