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https://www.stuller.com/articles/view/popular-us-platinum-jewelry-alloys/
Aug 15, 2012 · Popular U.S. Platinum Jewelry Alloys. By Stuller August 15, 2012 The following is a brief description of the general properties and applications of the most popular Pt alloys currently in use in the U.S. for jewelry manufacturing. 95% Pt / 5% Ru. Ruthenium is a grain refiner, meaning it gives the alloy a tight grain structure. ...
https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
The alloy used for tubing and machining is most likely different than the alloy preferred for casting, etc. Alloys designed for heat treatment are usually tertiary systems. The most common alloys in the United States are 950% Platinum with 50% Ruthenium or 5% Cobalt, and 90% Platinum with 10% Iridium.
https://www.technology.matthey.com/article/49/4/174-182/
In South Africa, the traditionally used alloy for casting platinum jewellery is Pt-5%Cu (melting range 1725–1745°C) because of its relatively low melting temperature and high fluidity compared to other commonly used alloys such as Pt-5%Ru ( 3 ). The performances of Pt-5%Cu and Pt-5%Ru (melting range 1780–1795°C) were compared.
https://www.whiteflash.com/jewelry-education/an-overview-of-common-alloys/
Common Platinum Alloys and their Properties. There are 4 platinum alloys commonly used in the USA. Pt900/Ir = 900 parts platinum, 100 parts Iridium. Pt950/Ir = 950 parts platinum, 50 parts Iridium. Pt950/Ru = 950 parts platinum, 50 parts Ruthenium. Pt950/Co = 950 parts platinum, 50 parts Cobalt.
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