Search Jensen
[ Alloys ] [ JRVT ] [ Technical Guide]


  Properties
Category Crown & Bridge
Nobility High Noble
Type Type II, III
Melting Range 1650°F to 1755°F
Density 15.4 g/cm3
Grain Size 22 microns
Hardness 120 HV
Tensile Elongation 55%
Tensile Yield Strength 35,300 psi
Ultimate Tensile Strength 59,300 psi
Chemistry
Gold 77% Silver 13%
Palladium 8.5% Copper 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.
Use of a refractory model is recommended for partial dentures.
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 1850°F (1010°C).
Finishing and Polishing
 Use standard techniques.
Soldering
 Recommended Solder: 650 Solder
Flux-Brown Fluoride