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Melting Points & Weights Reducing & Raising Factors
Melting Points & Density of Various Metals & Alloys Melting Point Metal
°F
°C
Specific Gravity
Density in Tr. Ozs. per Cu. In.
Aluminum Antimony Beryllium Bismuth Boron Brass
1220 1167 2340 520 3774 1805
660 630 1282 271 2079 985
2.70 6.62 1.82 9.80 2.34 8.68
1.423 3.488 .959 5.163 1.233 4.573
Cadmium Carbon Chromium Cobalt Copper
610 – 3430 2723 1981
321 – 1888 1495 1083
8.65 2.22 7.19 8.90 8.96
4.557 1.170 3.788 8.90 4.719
Gold 22K Yellow 18K Green 18K Yellow 18K White 18K Red 14K Green 14K Yellow 14K White 14K Red 10K Green 10K Yellow 10K White 10K Red
1945 1930 1810 1700 1730 1655 1765 1615 1825 1715 1580 1665 1975 1760
1063 1055 988 927 943 902 963 879 996 935 860 907 1079 960
19.32 18.58 15.90 15.58 14.64 15.18 14.20 13.07 12.61 13.26 11.03 11.57 11.07 11.59
10.180 9.790 8.375 8.211 7.712 7.998 7.482 6.885 6.642 6.986 5.810 6.096 5.832 6.106
Iridium Iron (pure) Lead
4449 2802 621
2454 1539 328
22.50 7.87 11.34
11.849 4.145 5.973
Magnesium Manganese Molybdenum Nickel Osmium
1202 2273 4760 2651 4892
650 1245 2625 1455 2700
1.74 7.43 10.20 8.90 22.50
.917 3.914 5.347 4.691 11.854
Palladium Phosphorus Platinum 10% Irid. Plat. 5% Irid. Plat.
2831 111 3224 3250 3235
1555 44 1733 1788 1779
12.00 1.82 21.45 21.54 21.50
6.322 .959 11.301 11.349 11.325
Rhodium Ruthenium Silicon Silver Sterling Coin Stainless Steel
3571 4500 2605 1761 1640 1615 2820
1967 2500 1430 961 893 879 1550
12.44 12.20 2.33 10.49 10.36 10.31 8.0
6.553 6.428 1.247 5.525 5.457 5.430 4.214
450 787
232 419
7.30 7.13
3.846 3.758
Tin Zinc
Reducing Factors Karat on Hand From
24K 22K 18K 14K
To 18K
.333 .222
Reducing Factors To 14K
.714 .571 .286
To 10K
1.400 1.200 .800 .400
To lower karat, locate the karat on hand in the left “From” column, then read across to the desired lower karat in the “To” column. Multiply the weight of your Karat Gold on hand by the “reducing factor.” This gives you the weight of the alloy you must add to reduce to the karat wanted. See example: Example: When changing 10 dwts. of 24K to 14K, locate the factor. A) 24K to 14K = .714 Multiply the factor by the weight of Gold to be converted. B) 10 dwts. × .714 = 7.14 dwts. Results: 10 dwts. of 24K, when added to 7.14 dwts. of alloy will give you 17.14 dwts. of 14K.
Raising Factors Karat on Hand From
10K 14K 18K
To 14K
.400
Raising Factors To 18K
1.333 .666
To 22K
6.000 4.000 2.000
To raise karat, locate the karat on hand in the left “From” column, then read across to the desired higher karat in the “To” column. Multiply the weight of your Karat Gold on hand by the “Raising Factor.” This gives you the weight of the fine gold you must add to raise to the karat wanted. See example: Example: When changing 10 dwts. of 14K to 18K, locate the factor. A) 14K to 18K = .666 Multiply the factor by the weight of gold to be converted. B) 10 dwts. × .666 = 6.66 dwts. Results: 10 dwts. of 14K, when added to 6.66 dwts. of Fine Gold will give you 16.66 dwts. of 18K.
David H. Fell & Company, Inc.