Metal Weights & Mesaures Alloyed metal specs Live metal Market quotes	Century Casting Company, Inc. 7 West 45th Street, Floor 7 New York NY 10036 800-997-8290 212-840-8303 Fax: 212-840-2318 Specializing in Platinum casting Alloyed jewlery metal specifications Platinum alloy compositions PT950 Platinum - 95% Platinum, 5% Ruthenium (950 Pt / 50 Ru) Melting range: 3230 - 3260 degree F, Hardness approx. 130, can be stamped 'Platinum' Ruthenium is a noble metal. Slightly harder to cast than PT900 due to extra hardness. PT900 Platinum - 90% Platinum, 10% Iridium (900 Pt / 100 Ir) Melting range: 3235 - 3270 degree F, Hardness approx. 110, must be stamped 90Pt/10Ir. Iridium is a noble metal. Bright as-cast surface, good hardness for setting. Doesn't oxidize, but shrinkage porosity a concern. Gold alloy composition - percentage by weight Alloy Gold Silver Copper Zinc Nickel Palladium 9K Yellow 37.5% 10% 45% 7.5% - - 9K White 37.8% - 40% 10.4% 11.8% - 14K Yellow 58.5% 4% 31.2% 6.3% - - 14K White 58.5% 0.5% 27% 7% 7% - 18K Yellow 75% 16% 9% - - - 18K White 75% 4% 4% - - 17% 22K Yellow 91.7% 5.5% 2.8% - - - Gold alloy composition - percentage by volume Alloy Gold Silver Copper Zinc Nickel Palladium 9K Yellow 22% 11% 56% 12% - - 9K White 21% - 48% 16% 14% - 14K Yellow 39% 5% 45% 11% - - 14K White 39% 1% 38% 12% 10% - 18K Yellow 61% 24% 16% - - - 18K White 63% 6% 7% - - 23% 22K Yellow 84% 5% 10% - - - This website, all information and photos contained therein ©2000 Century Casting Company, Inc. All rights reserved. No information or images may be reproduced without written consent.
Century Casting Company, Inc. 7 West 45th Street, Floor 7 New York NY 10036 800-997-8290 212-840-8303 Fax: 212-840-2318