BS EN ISO 9202:2019 pdf – Jewellery and precious metals – Fineness of precious metal alloys.
1 Scope This document specifies a range of fineness of precious metal alloys (excluding solders) recommended for use in the field of jewellery. NOTE There is a possibility that national legal requirements for the designation, marking, and stamping of finished articles exist in the respective countries. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11210, Jewellery — Determination of platinum in platinum jewellery alloys — Gravimetric method after precipitation of diammonium hexachloroplatinate ISO 11426, Jewellery — Determination of gold in gold jewellery alloys — Cupellation method (fire assay) ISO 11427, Jewellery — Determination of silver in silver jewellery alloys — Volumetric (potentiometric) method using potassium bromide ISO 11490, Jewellery — Determination of palladium in palladium jewellery alloys — Gravimetric determination with dimethylglyoxime ISO 11494, Jewellery and precious metals — Determination of platinum in platinum alloys — ICP-OES method using an internal standard element ISO 11495, Jewellery and precious metals — Determination of palladium in palladium alloys — ICP-OES method using an internal standard element ISO 13756, Jewellery — Determination of silver in silver jewellery alloys — Volumetric (potentiometric) method using sodium chloride or potassium chloride ISO 15093, Jewellery — Determination of precious metals in 999 0/00 gold, platinum and palladium jewellery alloys — Difference method using ICP-OES ISO 15096, Jewellery — Determination of silver in 999 0/00 silver jewellery alloys — Difference method using ICP-OES
3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/
3.1 fineness minimum content of the named precious metal, measured in terms of parts per thousand (‰) by weight of alloy 4? Analytical? methods? for? determining? fineness For determining the fineness of precious metal alloys, one of the following test methods shall be used: ISO 11210, ISO 11426, ISO 11427, ISO 11490, ISO 11494, ISO 11495, ISO 13756, ISO 15093, or ISO 15096. The recommended methods are listed in Table 1. 5? Range? of? fineness The fineness is stated as minimum value: no minus tolerance is allowed. Values are given in parts per thousand (‰).