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Back to Previous Page Weights Temperatures Measurements
Standard Weights, Measures, and Temperatures For Jewelers
Alloy Usage Guidelines
Platinum Alloy Usage
This chart will tell you which alloy is best suited for your job.
| PT Alloy |
Casting |
Fabrication |
Die Striking |
Machining |
| 90/10 Pt/Ir |
Satisfactory |
Excellent |
Excellent |
Poor |
| 95/5 Pt/Ir |
Poor |
Excellent |
Excellent |
Poor |
| Pt 950/Co |
Excellent |
Good |
Good |
Good |
| Pt 950/Ru |
Good |
Excellent |
Good |
Excellent |
| Pt 950/Heat treatable |
Excellent |
Good |
Excellent |
Excellent |
| Platinum Alloy |
Hardness HV |
Strength PSI |
| 90/10 Iridium |
110 HV |
55,000 PSI |
| 95/5 Iridium |
80 HV |
40,000 PSI |
| Platinum/Cobalt |
135 HV |
64,000 PSI |
| Platinum/Ruthenium |
135 HV |
66,000 PSI |
| Pt 950/Heat treatable |
240-330 HV Variable |
100,000 PSI + |
Platinum
- 90/10 Pt/Ir is an all round pt alloy. It can be used for all applications, but is best suited for fabrication
- 95/5 Pt/Ir is a fabrication alloy. It has high malleability and work-hardens rapidly. It is great for die striking. Because of its low hardness, it is not well suited for casting.
- Pt 950/Cobalt has a very fine grain and is ideal for casting. It is slightly Ferro-magnetic and oxidizes at about 1000°C. The oxidation can be removed with hot Sparex.
- Pt 950/Ruthenium is the best choice for multi-purpose use. It is ideal for machining and fabrication. Casting will deliver good results. Because of its structure, fine detail castings are somewhat more difficult to achieve.
- Pt 950 heat treatable alloys are ideal when spring action is needed, or a harder product is desired. The hardening feature gives these alloys great flexibility. The properties vary with alloys from different vendors. Ask for data sheets from metal providers.
Courtesy of: Platinum Guild International USA
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