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[ Alloys ] [ J-IV Palladium Free] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type IV
Melting Range 1615°F to 1670°F
Density 15.9 g/cm3
Grain Size 33 microns
Modulus of Elasticity 12.9x106 psi
Hardness
  As Cast
    Bench Cooled
    Quenched
  Heat Treated
    Soft
    Hard
 
 
230 HV
175 HV
 
155 HV
255 HV
Elongation
  As Cast
    Bench Cooled
    Quenched
  Heat Treated
    Soft
    Hard
 
 
18%
40%
 
46%
18%
Yield Strength
  As Cast
    Bench Cooled
    Quenched
  Heat Treated
    Soft
    Hard
 
 
91,350 psi
57,375 psi
 
47,140 psi
92,820 psi
Ultimate Tensile Strength
  As Cast
    Bench Cooled
    Quenched
  Heat Treated
    Soft
    Hard
 
 
101,500 psi
76,850 psi
 
68,170 psi
105,150 psi
Chemistry
Gold 72.5% Copper 13.5%
Silver 10.2% Platinum 2.8%
Iridium less than 1% Zinc 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.
Use of a refractory model is recommended for partial dentures.
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 between 1760°F and 1850°F (960°C and 1010°C).
Bench cool to obtain the hardened condition.
Water quench from a dull red heat to obtain the softened condition.
Heat Treatment
Anneal at 1350°F for 10 minutes then water quench to obtain the softened condition.
After annealing, heat treat at 450°F for 20 minutes to obtain the hardened condition.
Finishing and Polishing
 Use standard techniques.
Soldering
 Recommended Solder: 615 Solder
Flux-Brown Fluoride