METAL
° F
° C
SPECIFIC GRAVITY
WEIGHT IN TROY OZ PER CU IN
Aluminum
1220
660
2.70
1.423
Antinomy
1167
630
6.62
3.488
Beryllium
2340
1282
1.82
0.959
Bismuth
520
271
9.80
5.163
Cadmium
610
321
8.65
4.557
Carbon
-
-
2.22
1.170
Chromium
3430
1888
7.19
3.788
Cobalt
2723
1495
8.90
8.900
Copper
1981
1083
8.96
4.719
Gold
1950
1065
19.32
10.180
18K Green
1810
988
15.90
8.375
18K Yellow
1700
927
15.58
8.211
18K White
1730
943
14.64
7.712
18K Red
1655
902
15.18
7.998
14K Green
1765
963
14.20
7.482
14K Yellow
1615
879
13.07
6.885
14K White
1825
996
12.61
6.642
14K Red
1715
935
13.26
6.986
10K Green
1580
860
11.03
5.810
10K Yellow
1665
907
11.57
6.096
10K White
1975
1079
11.07
5.832
10K Red
1760
960
11.59
6.106
Iridium
4449
2454
22.50
11.849
Iron (Pure)
2802
1539
7.87
4.145
Lead
621
328
11.34
5.973
Magnesium
1202
650
1.74
0.917
Manganese
2273
1245
7.43
3.914
Molybdenum
4760
2625
10.20
5.347
Nickel
2651
1455
8.90
4.691
Osmium
4892
2700
22.50
11.854
Palladium
2831
1555
12.00
6.322
Phosphorus
111
44
1.82
0.959
Platinum
3224
1773
21.45
11.301
15% Iridium Plat.
3310
1821
21.59
11.373
10% Iridium Plat.
3250
1788
21.54
11.349
5% Iridium Plat.
3235
1779
21.50
11.325
Rhodium
3571
1967
12.44
6.533
Ruthenium
4500
2500
12.20
6.428
Silicon
2605
1430
2.33
1.247
Silver
1761
961
10.49
5.525
Steling Silver
1640
893
10.36
5.457
Coin Silver
1615
879
10.31
5.430
Tin
450
232
7.30
3.846
Zinc
787
419
7.13
3.758

How to determine specific gravities of alloys
1. Find the reciprocal of the specific gravity of each metal in the alloy. This is done by dividing 1 by the specific gravity. For example, the specific gravity of silver is 10.49 and the reciprocal is 1 divided by 10.49 or 0.094966
2. Multiphy each reciprocal by the number of parts per thousand of that metal to be used.
3. Add the results of the multiplication together.
4. Divide 1000 by this total - the answer is the specific gravity of the alloy.

Example*:
Find the specific gravity of 14K yellow gold having 583 parts gold, 104 parts silver, and 313 parts copper.

First figure the reciprocals of the specific gravities:
Fine gold : 1 divided by 19.32 = 0.051759
Fine silver : 1 divided by 10.49 = 0.094966
Fine copper : 1 divided by 8.96 = 0.111617

Fine gold : 1 divided by 19.32 = 0.051759
Fine silver : 1 divided by 10.49 = 0.094966
Fine copper : 1 divided by 8.96 = 0.111617

Then multiply :
Fine gold : 583 parts by 0.051759 = 30.128
Fine silver : 104 parts by 0.094966 = 9.876
Fine copper : 313 parts by 0.111617 = 34.956
Total :              1000                                    75.014

1000 divided by 75.014 = 13.33 (the specific gravity of the alloy)

* The specific gravity for any one karat will naturally vary for each composition.



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