BS ISO 24018 pdf free download

BS ISO 24018-2020 pdf free download.Jewellery and precious metals — Specifications for 1 kilogram gold bar.
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 cast gold bars produced for investment markets or industrial (jewellery, electronic) markets.
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 11426, Jewellery — Determination of gold in gold jewellery alloys — Cupellation method (fire assay)
ISO 15093, Jewellery and precious metals — Determination of high purity gold, platinum and palladium —
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 cast bar
homogeneous bar produced in a mold directly from melted metal, without further metallurgical treatment after solidification, with a rectangular parallelepiped shape
Note 1 to entry: Usually the cast bar is formed as a truncated pyramid to allow an easier extraction from the mold.
3.2 top surface
one of the two largest surfaces of the bar, which is the last part of the bar to solidify
4 Requirements
4.1 Fineness
The minimum fineness of gold bars is 995 ‰. The following finenesses are acceptable:
— 999,9 ‰;
— 999,5 ‰;
— 999 ‰;
4.4 Surface quality
Bars should have flat and smooth surfaces (a small shrinkage on the top surface is acceptable), and be free from cavities, holes, and significant layering. Edges shall not be sharp and pose a handling hazard.
NOTE There is no specification for the internal quality, but the presence of gas bubbles can lead to bar rejection based on abnormal results of ultrasonic or electrical conductivity testing.
4.5 Markings
All markings shall be only on the top surface. Markings shall be made using pressure stamping, dot matrix or laser markings (or a combination of those techniques). Markings shall be persistent and not alterable during handling and storage.
The following minimum information shall be marked in an unambiguous way:
a) name or logo of the manufacturer, and/or brand mark;
b) “gold” or “Au” to indicate the nature of the metal;
c) mass in kilogram or gram, including the weighing unit, with up to 4 significant figures;EXAMPLE “1 kg”, “1,000 kg”, “1 000 g”.
d) fineness in per thousand (‰) or percent (%), with or without the unit, with 3 or 4 significant figures; EXAMPLE “999,9 ‰”, “99,90 %”, “995”.
e) unique serial number;
The following information may also be added:
a) assay mark;
b) manufacturing year;
c) only for bars in accordance with “999,9 ‰ ISO 24018” list of impurities, the reference “ISO 24018”;
d) country of origin.
5 Security feature
The bar may bear on any side a security feature to guarantee its integrity and prevent counterfeiting.
If this feature adds mass to the bar, this shall be disclosed in the certificate of analysis. Presence of a security feature shall not compromise the physical specification as per 4.3.
6 Certificate of analysis
A certificate of analysis shall accompany each bar, with at least the following information:
a) name or logo of the manufacturer;
b) “gold” or “Au” to indicate the nature of the metal;
c) mass (as defined in 4.5);
d) fineness (as defined in 4.5);
e) unique serial number (same as the one stamped on the bar);
f) date of manufacturing;BS ISO 24018 pdf download.