category | name | Minimum content of Au | ||
Draft National Standard 1 (‰) | Shanghai Enterprise Standards (‰) | Wuhan Enterprise Standard (%) | ||
pure gold | pure gold Thousands of gold 24K | 990 999 999.9 | 990 999.9 | 98.0 99.9 99.6 |
K gold | 22K 21K 20K 18K 14K 12K 10K 9K 8K | 916.7 875 833 750 585 500 417 375 333 | 916.7 875 833 750 585 500 417 375 | 91.3 87.16 83.0 74.7 58.1 49.8 41.5 37.35 33.2 |
Country or region | Gold purity (%) |
Japan, the Soviet Union | 99.99 |
United Kingdom | 99.5 |
South Africa | 99.6 |
Hong Kong and Macao | >95.84 |
National standard draft Chinese traditional habit Private K | 99.99 99.6 98.4 |
Part | Au (%) | Ag (%) | Cu (%) | Zn (%) | Ni | thickness |
Plating | 59.56 | 8.25 | 27.85 | 3.75 | 15μm | |
Adhesion layer | 97.93 | 15μm | ||||
Carcass | 0.049 | 88.9 | 10.77 |
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