Composition:
Gold 62.0%
Palladium 3.0%
Silver 25.0%
Copper 9.5%
Balance Zn, Ir
Color: Yelow
Applications: EL DORADO 62 is a high noble type III Crown and Bridge alloy for single and 3/4 crowns, inlays, veneer crowns, and short span bridgework.
Physical Properites:
| Casting Temperature | 1886F (1030C) |
| Melting Range | 1652-1778F (900-970C) |
| Density (gm/cc) | 14.3 |
| Vickers Hardness | Q-170, H-245 |
| Tensile Strength | Q-70,000 psi H-100,000 psi |
| Yield Strength | Q-42,000 psi H-80,000 psi |
| Elastic Modulus | 15,000,000 psi |
| Elongation(%) | Q-45, H-20 |
Recommended Processing:
| Recomended Solders | 615 |
| Recommended Investment |
Spruing:
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 1300F (704C) and hold for 1 hour. Add ten minutes for each additional ring.
Melting and Casting: EL DORADO 62 has a casting temperature of 1886F(1030C). An air/gas torch with multiorifice tip and a white flux are recommended. Use a minimal amount of flux. The alloy will run together and pool and a thin cloudy surface will appear. When the cloudiness disappears, cast. Clean buttons may be remelted with 50% addition of new alloy. Do not overheat the alloy.
Preparing Framework: Casting may be blasted using 50u aluminum oxide or glass beads. The alloy may be heat hardened by placing in a furnace at 600F 316C. Heat soak for 15 minutes, then bench cool. Pickle with a good pickling acid. Shape, finish and polish.
Soldering:Use 615 solder with a paste flux and an air/gas torch.
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