Composition:
Gold 75.0%
Palladium
11.9%
Silver 10.0%
Indium 1.9%
Tin 1.0%
Balance Re, Ir
Color: Yellow
Applications: GATEWAY 75 is a high noble yellow colored ceramic alloy for single units, 3/4 crowns and short and long span bridgework.
Physical
Properites:
| Casting Temperature | 2350F (1290C) |
| Melting Range | 2025-2200F (1105-1205C) |
| Density (gm/cc) | 16.1 |
| Vickers Hardness | 230 |
| Tensile Strength | 89,000 psi |
| Yield Strength | 60,750 psi |
| Elastic Modulus | 13,875,000 psi |
| Elongation(%) | 7% |
| TCE x 10-6/C(500C): | 14.9 |
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 800F (425C) and hold for 30 minutes. Raise temperature to 1500F (816C) and hold for 1 hour plus ten minutes for each additional ring.
Melting and Casting: GATEWAY 75 has a casting temperature of 2350F(1290C). Use a fuel/oxygen torch with multiorifice tip. Do not use flux. The alloy will run together and pool and a thin cloudy surface will appear. 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 slightly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1200F (649C) oven and raise temperature to 1810F (988C) without vacuum at a heating rate of 100F/min (56C/min). 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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