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[ Alloys ] [ JA ] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type I
Melting Range 1735°F to 1815°F
Density 16.4 g/cm3
Hardness 70 HV
Tensile Elongation 45%
Tensile Yield Strength 14,600 psi
Ultimate Tensile Strength 40,000 psi
Chemistry
Gold 83.3% Silver 12.5%
Copper 3.5% Zinc less than 1%
Iridium less than 1%    

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.
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-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 1900°F (1040°C).
Finishing and Polishing
 Use standard techniques.
Soldering
 Recommended Solder: 650 Solder
Flux-Brown Fluoride