ISO 3160:1975

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INTERNATIONAL STANDARD
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Watch cases and their accessories - General requirements for
gold alloy coverings
Boîtes de montres et leurs accessoires - Caractéristiques générales relatives aux revêtements en alliages d'or
First edition - 1975-04-01
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Descriptors : clocks, metal coatings, gold alloys, gold coatings, specifications.
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INTERNATIONAL STANDARD IS0 3160-1975 (E)
Watch cases and their accessories - General requirements for
gold alloy coverings
1 SCOPE AND FIELD OF APPLICATION 4 MEASUREMENT OF THICKNESS OF COVERING
The thickness of the covering shall be measured at those
This International Standard lays down technical definitions
points of the surface which can be touched by a ball of
concerning gold alloy coverings.
5 mm diameter.
This International Standard applies to watch cases, their
accessories and crowns, including bracelets when they are
permanently attached to the case.
5 THICKNESS OF COVERINGS
5.1 Gold plated covering
The range of nominal thicknesses is the following 0,5 - 1 -
2 DEFINITIONS
2 - 5 - 10 - 20 - 40 - 80 pm, with a tolerance of - 20 %.
2.1 gold plated covering : A method of covering by which
5.2 Rolled gold covering
a layer of gold alloy is applied to the component by
electrolytic, chemical or other process.
The range of nominal thicknesses is the following 2 - 5 -
1 O - 20 - 40 - 80 pm, with a tolerance of - 20 %.
22 rolled gold covering : A metho
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