Composition:
Gold 55.9%
Palladium
8.5%
Silver 31.0%
Indium 2.8%
Zinc 1.6%
Balance Re,Ir
Color: White
Applications: AURORA 56 LF is a high noble, yellow colored, palladium/gold alloy for single units, 3/4 crowns and short and long span bridgework. It is for low fusing porcelains only.
Physical Properites:
| Casting Temperature | 1940F (1060C) |
| Melting Range | 1800 - 1975F (984-1078C) |
| Density (gm/cc) | 13.9 |
| Vickers Hardness | Cer./Por. Cycle - 225, H - 240 |
| Tensile Strength | Cer./Por. Cycle - 87,000 H - 90,000 |
| Yield Strength | Cer./Por. Cycle - 600, H - 620 |
| Elastic Modulus | Cer./Por. Cycle - 62,000, H - 64,000 |
| Elongation(%) | Cer./Por. Cycle - 427, H - 441 |
| TCE x 10-6/C(500C): | 16.8 |
Recommended Processing:
| Recomended Solders | Pre solder using Gateway PLF solder without flux. Post solder using Gateway 720 solder |
| Recommended Investment |
Soldering: Pre solder using Gateway PLF solder without flux. Post solder using 720 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 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 500F (260C) and hold for 30 minutes. Raise temperature to 1300F (704C) and hold for 1 hour plus ten minutes for each additional ring.
Melting and Casting: AURORA 56 LF has a casting temperature of 1940F(1060C). Use a fuel/oxygen torch with multiorifice tip. Do not use flux. Allow to bench cool before divesting. Add 50% new material to buttons.
Finishing: Casting may be blasted using 100-150 micron aluminum oxide. Shape and finish leaving a slightly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1100F (593C) oven and raise temperature at 100F/min (56C/min)to 1562F (850C) without vacuum. Hold for 15 minutes. Then, 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. The alloy can be heat hardened by placing in a furnace at 1110F (600C). Heat soak 15 minutes, then allow to bench cool.
Opaquing: Follow porcelain manufacturer's instructions.
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