Composition:
Palladium 60%
Silver
28%
Indium 6.0%
Tin 6.0%
Balance Ru, Re
Color: White
Applications: LA PLATA 28 is a white colored noble palladium/silver porcelain-fused-to-metal dental casting alloy. It is designed for single units, 3/4 crowns, and short and long span bridgework.
Physical Properites:
| Casting Temperature | 2490F (1370C) |
| Melting Range | 2245-2370F (1230-1300C) |
| Density (gm/cc) | 10.8 |
| Vickers Hardness | 220 |
| Tensile Strength | 95,000 psi |
| Yield Strength | 67,000 psi |
| Elastic Modulus | 20,000,000 psi |
| Elongation(%) | 20 |
| TCE x 10-6/C(25-600C): | 14.6 |
Recommended Processing:
| Recomended Solders | Pre GPW, Post GPY |
| Recommended Investment | PB-CF |
Soldering: Pre solder using Gateway GPW solder without flux. Post solder using Gateway GPY 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 carbon-free phosphate-bonded 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 (815C) and hold for 1 hour plus 10 minutes for each additional ring.
Melting and Casting: LA PLATA 28 has a casting temperature of 2490F(1370C). Use a fuel/oxygen torch with multiorifice tip. Do not use flux. Allow to bench cool before divesting. Add 50% new material to buttons. Do not use graphite crucibles.
Finishing: Grind metal surfaces for porcelain application with non-contaminating aluminum oxide stones. Blast with new 50 micron aluminum oxide. Clean in distilled water in ultrasonic cleaner for 10 minutes.
Degassing:Place units in a 1300F (700C) oven and raise temperature to 1900F (1040C) without vacuum. Hold for 10 minutes. Remove at once and bench cool. Remove all oxide by blasting with new 50 micron aluminum oxide. Clean in distilled water in ultrasonic cleaner for 10 minutes.
Opaquing: Follow porcelain manufacturer's instructions.
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