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[ Alloys ] [ JCB ] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type III
Melting Range 1625°F to 1680°F
Density 14.2g/cm3
Grain Size 15 microns
Hardness
  Hardened
  Softened
 
165 HV
135 HV
Tensile Elongation
  Hardened
  Softened
 
26%
50%
Yield Strength
  Hardened
  Softened
 
63,820 psi
58,010 psi
Ultimate Tensile Strength
  Hardened
  Softened
 
65,000 psi
35,600 psi
Modulus of Elasticity
  Hardened
  Softened
 
84,000 psi
60,300 psi
Chemistry
Gold 62% Silver 25%
Copper 9% Palladium 3%
Zinc less than 1% Indium less than 1%
Iridium 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
 900°F (480°C) to 1200°F (650°C)
Melting / Casting
No extra winds of the casting arm are required (2-3 winds typical)
Multi-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 1775°F (970°C).
Bench cool to obtain the hardened condition.
Water quench from a dull red heat to obtain the softened condition.
Finishing and Polishing
 Use standard techniques.
Soldering
 Recommended Solder: 615 Solder
Flux-Brown Fluoride