BS ISO 24018:2020 pdf free.Jewellery and precious metals -Specifications for 1 kilogram gold bar.
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. 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. 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 (%0) or percent (%), with or without the unit, with 3 or 4 significant figures; EXAMPLE “999,9 %o”,“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 %o ISO 24018”list of impurities, the reference “ISO 24018”; d) country of origin. 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. 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;It is recommended to pack 25 bars of 1 kg bars in one case. During transportation and storage, the bars shall not be damaged or contaminated. BS ISO 24018 pdf download.