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[ Alloys ] [ JMC ] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type III
Melting Range 1645°F to 1810°F
Density 12.9 g/cm3
Grain Size 24 microns
Hardness
  Hardened
  Softened
 
230 HV
170 HV
Tensile Elongation
  Hardened
  Softened
 
14%
22%
Tensile Yield Strength
  Hardened
  Softened
 
76,000 psi
47,000 psi
Ultimate Tensile Strength
  Hardened
  Softened
 
94,700 psi
68,000 psi
Chemistry
Gold 47% Silver 39%
Copper 7% Palladium 6%
Zinc 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 1900°F (1040°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: 585 Solder
Flux-Brown Fluoride