preface
ISO (International Organization for Standardization) is the 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 on which a technical committee has been established has the right to be represented on the Committee. Governmental and non-governmental international organizations liaising with ISO are also involved in this effort. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

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

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

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

ISO 3549-1995 “Zinc powder pigments for paints — Specifications and test methods”

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

2 Normative reference files

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 investigate the possibility of applying the latest versions of the following standards. IEC and ISO members maintain a register of international standards currently in force.

ISO 565:1990, Nominal dimensions for openings of test screens — wire cloths, perforated metal sheets and electrocast sheets.

ISO 594-1:1986, tapered joints of 6 per cent taper (luhr) 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 – Specification and test methods.

ISO 3549-1995 “Zinc powder pigments for paints — 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 metal content, chemical purity, particle shape, particle size distribution, average and maximum diameter of zinc powder pigments used in coatings may vary. All of these changes may affect the behavior of zinc powder in coatings coating parameters such as dispersity, grinding fineness, reactivity, electrical conductivity and filling properties.

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