Composition:
Gold 20%
Palladium 20%
Silver 38%
Indium 18%
Zinc 4%
Balance Ir
Color: Yelow
Applications: OZARK 20 is a yellow colored 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 | 1985F (1085C) |
| Melting Range | 1555-1875F (845-1025C) |
| Density (gm/cc) | 10.7 |
| Vickers Hardness | Q-160, H-180 |
| Tensile Strength | Q-75,000 psi H-80,000 psi |
| Yield Strength | Q-30,000 psi H-37,000 psi |
| Elastic Modulus | 12,000,000 psi |
| Elongation(%) | Q-16, H-10 |
Recommended Processing:
| Recomended Solders | GPY or 615 |
| Recommended Investment | GB |
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 1200F (650C) and hold for 1 hour. Add ten minutes for each additional ring.
Melting and Casting: OZARK 20 has a casting temperature of 1985F(1085C). 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. Shape, finish and polish usuing usual techniques.
Soldering:Use Gateway GPY or 615 solder with a paste flux and an air/gas torch.
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