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[ Alloys ] [ JP-Ia ] [ Technical Guide]


  Properties
Category PFM
Nobility High Noble
Melting Range 2050°F to 2225°F
Coef. of Thermal Expansion
   from 25°C to 500°C
   from 25°C to 600°C
13.6x10-6K-1
13.9x10-6K-1
Density 13.6 g/cm3
Hardness 305 HV
Tensile Elongation 25%
Tensile Yield Strength 84,400 psi
Ultimate Tensile Strength 106,000 psi
Chemistry
Gold 48% Palladium 38.5%
Indium 8.% Gallium 1.5%
Ruthenium less than 1% Rhenium less than 1%
Copper 4%    
       
 

Waxing / Spruing

 .Wax to a minimum thickness of 0.3mm for single units and 0.5mm for bridge work. Avoid sharp angles and wax to provide for an even thickness of porcelain.
Investment
 A phosphate-bonded, high heat investment with or without carbon content is recommended
Burnout
 Place in a cold furnace and raise temperature to 1500oF (816oC). Allow casting ring to burnout for one hour and 10 minutes at temperature. Increase time for larger or multiple rings.
Melting / Casting
 Wind casting machine one additional turn. Use a multi-orifice torch with 10 PSI gas pressure and 20 PSI oxygen pressure. Use a reducing flame to prevent overheating. When alloy is melted, a cloudy surface will appear. When cloudy surface clears, release casting machine. DO NOT OVERHEAT. DO NOT USE FLUX. The casting temperature is 2350oF.
Finishing
 Blast with aluminum oxide to remove investment particles. Shape and finish down metal with aluminum oxide stones. Reblast porcelain receiving surface with non-recycled aluminum oxide. Clean casting in ultrasonic 10 minutes in distilled water.
Conditioning
 Oxidize from 1200o to 1850oF (650o to 1010oC) under vacuum. Hold for 5 minutes. Bench cool. Proceed with normal porcelain technique.
Pre-solder
 Recommended solder: Spirit
Flux-Brown Fluoride
Post-solder
 Recommended solder: 1400
Flux-Brown Fluoride