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7、愀猀瀀砀琀M廱/u后台访问/flexpaper/Add.aspx?t=1569810892788106.52.37.1150潮攀瀀栀琀洀氀M谀/u后台访问/flexpaper/Add.aspx?t=1569810894216106.52.37.1150甀輀昀氀攀砀瀀愀瀀攀爀搀搀愀猀瀀砀琀M廱/u后台访问/flexpaper/Add.aspx?t=1569810896958106.52.37.115tion WORKING DRAFT ISO/WD 24018:2019(E) ISO 2019 All rights reserved 1 Jewellery and precious metals
8、 One kilo bar Specifications 1 Scope This document specifies the requirements, test methods, inspection, marking, packaging, transportation, storage, quality certificate and the order (or contract) information of one kilogram gold bars. This document is applicable to one-kilogram casted gold bars pr
9、oduced for investment markets or industrial (jewellery, electronic) markets. 2 Normative references 3 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 edi
10、tion cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11426, Jewellery Determination of gold in gold jewellery alloys Cupellation method (fire assay) ISO 15093, Jewellery and precious metals Determination of 999 gold, platin
11、um and palladium Difference method using ICP-OES 4 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 http:
12、/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/ 3.1 cast bar bar produced in a mold directly from melted metal, without further metallurgical treatment after solidification 3.2 top surface one of the two largest surfaces of the bar which is the last part bar to solidify I
13、SO/WD 24018:2019(E) 2 ISO 2019 All rights reserved 5 Requirements 5.1 Fineness The minimum fineness of gold bars is 995 . The following finenesses are acceptable: 999,90 ; 999,00 ; 995,00 . Fineness shall be determined by an appropriate analytical method, including but not limited to cupellation (IS
14、O 11426 for fineness up to 999.5) and difference method using ICP-OES (ISO 15093 for fineness of and above 999) Fineness shall be determined with 5 significant numbers, with no rounding up allowed. EXAMPLE 999,89 shall be marked as 999,50 5.2 Impurities (PROPOSAL TO DISCUSS) For bars with a fineness of 999,90 and higher, two specifications are available for 1 kilogram gold bars, depending on the impurity levels. ISO 24018- 9950 ISO 24018- 9990 ISO 24018
