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[ Alloys ] [ JRVT Palladium Free ] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type II, III
Melting Range 1680°F to 1725°F
Density 15.4 g/cm3
Grain Size 25 microns
Hardness
  As Cast
  Hardened
 
120 HV
160 HV
Tensile Elongation
  As Cast
  Hardened
 
50%
40%
Yield Strength
  As Cast
  Hardened
 
31,000 psi
41,500 psi
Ultimate Tensile Strength
  As Cast
  Hardened
 
57,000 psi
64,000 psi
Chemistry
Gold 77% Silver 13%
Copper 8.5% Platinum 1%
Zinc less than 1% Iridium less than 1%
Indium less than 1%    

Waxing / Spruing
Sprue to the bulkiest section.
Sprue diameter should be equal to the thickness of the bulkiest section.
Sprues longer than 3/8" should have a reservoir 1/16" from pattern.
Patterns should be no farther than 1/4" from top of investment.
Use direct method for single units and small castings.
Use indirect method for bridges and larger castings.
Investment
 Gypsum or phosphate bonded investment.
Burnout
 Hygroscopic 900°F (480°C), Thermal 1200°F (650°C)
Melting / Casting
No extra winds of the casting arm are required (2-3 winds typical)
Multi-or single-orifice torch: 5 psi fuel and 10 psi oxygen.
The alloy will fully puddle and form a ball before it is ready to cast. DO NOT OVERHEAT.
Cast at around 1800°F (1000°C.)
Heat Treatment Anneal at 1350°F for 10 minutes then water quench. Age harden the annealed alloy at 450°F for 30 minutes.
Finishing and Polishing
 Use standard techniques.
Soldering
 Recommended Solder: 650 Solder
Flux-Brown Fluoride