Composition:
Gold 55%
Palladium 5%
Silver 28.5%
Copper 10.6%
Balance In, Zn, Ir
Color: Yelow
Applications: EL DORADO 55 is a high noble type III hard cast gold dental casting alloy. It is designed for use in crowns, inlays, M.O.D.'s, veneer crowns, 3/4 crowns and short span bridgework.
Physical Properites:
| Casting Temperature | 1840F (1005C) |
| Melting Range | 1605-1730F (875-945C) |
| Density (gm/cc) | 13.7 |
| Vickers Hardness | Q-170, H-250 |
| Tensile Strength | Q-73,000 psi H-104,000 psi |
| Yield Strength | Q-48,000 psi H-95,000 psi |
| Elastic Modulus | 15,500,000 psi |
| Elongation(%) | Q-38, H-13 |
Recommended Processing:
| Recomended Solders | 585 |
| Recommended Investment | GB |
Single units - Direct method with 8 ga. sprues and adequate resevoirs.
Multiple Units - Indirect Method with runner bars and 8 ga. sprues.
Investment: Use a low-heat gypsum-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 1200F (650C) and hold for 1 hour. Add ten minutes for each additional ring.
Melting and Casting: EL DORADO 55 has a casting temperature of 1840F(1005C). An air/gas torch with multiorifice tip and a white flux are recommended. Clean buttons may be remelted with 50% addition of new alloy. Do not overheat the alloy.
Preparing Framework: Casting may be blasted using aluminum oxide. Pickle with a good pickling acid. Shape, finish and polish.
Soldering:Use 585 solder with a paste flux and an air/gas torch.
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