Composition Of Alloys

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