Composition:
Gold 69.0%
Palladium
18.4%
Silver 9.0%
Indium 2.0%
Tin 1.5%
Balance Re, In
Color: White
Applications: AURORA 69 is a high noble white colored gold/palladium/silver porcelain-to-metal alloy for single units, 3/4 crowns, short and long span bridgework and implant cases.
Physical Properites:
| Casting Temperature | 2417F (1325C) |
| Melting Range | 2102-2318F (1150-1270C) |
| Density (gm/cc) | 15.5 |
| Vickers Hardness | 230 |
| Tensile Strength | 96,000 psi |
| Yield Strength | 75,000 psi |
| Elastic Modulus | 15,500,000 psi |
| Elongation(%) | 6 |
| TCE x 10-6/C(500C): | 14.5 |
Recommended
Processing:
| Recomended Solders | Pre YSF, Post 585 |
| Recommended Investment |
Soldering: Pre solder using Gateway YSF solder without flux. Post solder using 585 solder.
Spruing:
Single crowns - Direct method with 8 ga. sprues and adequate resevoirs.
Multiple Units and bridges - Use 6 ga. runner bars with 10 ga. sprues to units and 8 ga sprues to the sprue base.
Investment: Use a carbon free high-heat phosphate-based investment following the manufacturer's instructions.
Burnout: After adequate set-up time, place ring(s) in oven at room temperature and raise temperature to 1300F (704C) according to Manufacturer's instructions
Melting and Casting: AURORA 69 has a casting temperature of 2417F(1325C). Use a fuel/oxygen torch with multiorifice tip. Do not use flux.The alloy will run together and pool with a thin, cloudy surface. Cast when the cloudiness disappears. Allow to bench cool before divesting. Add 50% new material to buttons. Do not use graphite crucibles.
Finishing: Casting may be blasted using 100-150 micron aluminum oxide. Shape and finish leaving a sligtly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1300F (704C) oven and raise temperature to 1900F (1040C) at a heatung rate of 100F/min. (56C/min) without vacuum. Remove at once and bench cool. Remove oxide with new 100-150 micron aluminum oxide. Clean in distilled water in ultrasonic cleaner for 10 minutes.
Opaquing: Follow porcelain manufacturer's instructions.
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