Composition Of Some Alloys

This table lists alloys commonly used in the jewellery making industry. For each alloy, the list shows the components of each component of the alloy as a percentage,  the Melting Point and the Specific Gravity.

METALS AU % AG % CU % ZN % OTHER % MELTING POINT SP.GRAV.
Jeweller’s Brass     88 12   1030° C 1886° F 8.7
Red Brass     90 10   1044° C 1910° F 8.8
Bronze     96   4 Sn 1060° C 1945° F 8.8
Copper     100     1083° C 1981° F 8.9
Gold (Fine) 100         1063° C 1945° F 19.3
22K yellow 92 4 4     977° C 1790° F 17.3
22K coinage 90 10       940° C 1724° F 17.2
18K yellow 75 15 10     882° C 1620° F 15.5
18K yellow 75 12 ½ 12 ½     904° C 1660° F 15.7
18K green 75 25       966° C 1770° F 15.6
18K rose 75 5 20     932° C 1710° F 15.5
18K white 75       25 Pd 904° C 1660° F 15.5
14K yellow 58 25 17     802° C 1476° F 13.4
14K green 58 35 7     835° C 1535° F 13.6
14K rose 58 10 32     827° C 1520° F 13.4
14K white 58       42 Pd 927° C 1700° F 13.7
10K yellow 42 12 41 5   786° C 1447° F 11.6
10K yellow 42 7 48 5   876° C 1609° F 11.6
10K green 42 58       804° C 1480° F 11.7
10K rose 42 10 48     810° C 1490° F 11.6
10K white 42       58 Pd 927° C 1760° F 11.8
Nickel Silver     65 17 18 Ni 1110° C 2030° F 8.8
Palladium         100 Pd 1549° C 2820° F 12.2
Old pewter         80 Pb, 20 Sn 304° C 580° F 9.5
Platinum         100 Pt 1774° C 3225° F 21.4
Silver (fine)   100       962° C 1763° F 10.6
Sterling   92 ½ 7 ½     893° C 1640° F 10.4

Source: Complete Metalsmith, Tim McCreight

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