JM 95.2 Pt. /4.8% Ru - Platinum Casting Grain


Quantity Discounts Prices as low as

Qty Check/Wire Bitcoin Card/Paypal
1-9 $1313.09 $1339.35 $1378.74
10-99 $1306.52 $1332.79 $1359.05
100+ $1299.96 $1326.22 $1352.48


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)