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[ Alloys ] [ JP-II ] [ Technical Guide]


  Properties
Category PFM
Nobility High Noble
Melting Range 1990°F to 2190°F
Coef. of Thermal Expansion
   from 25°C to 500°C
   from 25°C to 600°C

14.2x10-6K-1
14.4x10-6K-1
Density 18.5 g/cm3
Grain Size 15 microns
Hardness 155 HV
Tensile Elongation 17%
Tensile Yield Strength 50,700 psi
Ultimate Tensile Strength 64,200 psi
Chemistry
Gold 87% Platinum 7%
Palladium 4.5% Gallium 1.5%
Tin less than 1% Indium less than 1%
Iron less than 1% Rhenium less than 1%

Waxing / Spruing

.3mm for single units and .5mm for bridge work.
Investment
A phosphate-bonded investment with or without carbon.
Burnout
1350°F (735°C)
Melting / Casting
No extra winds of the casting arm are required (2-3 winds typical)
Multi-orifice torch: 10 psi fuel and 20 psi oxygen.
Cast at around 2290°F (1255°C)
Finishing
Finish with carbides or aluminum oxide stones. Blast porcelain receiving surface with non-recycled aluminum oxide. Clean in ultrasonic for 10 minutes.
Conditioning
Oxidize from 1200°F (650°C) to 1850°F(1010°C) in air. Hold for 5 minutes. Proceed with normal opaque technique.
Polishing
Use low speeds and light pressure. We recommend the use of tin oxide and/or high shine rubber wheels for easy final polishing.
Pre-solder
Recommended solder: Spirit, LX
Flux-Brown Fluoride
Post-solder
Recommended solder: 615
Flux-Brown Fluoride