The JM 95.2 Pt. /4.8% Ru platinum casting grain is among the most popular platinum alloys among jewelry manufacturers in the U.S. Both alloys contain Ruthenium which is a grain refiner. It gives the alloys a definite structure. This alloyed platinum has an annealed hardness of 120 HV (Vickers hardness) and a working hardness of about 220HV. The platinum alloy also has high tensile strength.
The three properties of Pt/Ru mentioned above make it suitable for machine casting and polishing. This makes it an excellent alloy in the manufacture of rings. You’ll get a bright-colored platinum jewel or item from the .950 platinum casting grains and pieces.
Features & Specifications
- Manufacturer: JM
- Metal Color: White
- Metal Type: Platinum
- Metal Fineness: .950
- Form: Grains/pieces
- 95.2% platinum 4.8% Ruthenium
- Pre-alloyed temperatures (no platinum) 2985°F (1640°C)
- Casting as platinum temperatures 3110°F (1710°C)