Composition:
Gold 88.4%
Platinum
9.58%
Manganese 1.0%
Balance Zn, In, Ir
Color: Yellow
Applications: CONCORD 88 is a high noble yellow colored silver-free gold/platinum porcelain-to-metal alloy for single units, 3/4 crowns and short and long span bridgework and bridge cases.
Physical Properites:
| Casting Temperature | 2300F (1260C) |
| Melting Range | 1922-2192F (1050-1200C) |
| Density (gm/cc) | 18.9 |
| Vickers Hardness | 195 |
| Tensile Strength | 87,000 psi |
| Yield Strength | 70,000 psi |
| Elastic Modulus | 12,000,000 psi |
| Elongation(%) | 8 |
| TCE x 10-6/C(500C): | 14.5 |
Recommended
Processing:
| Recomended Solders | Pre YSF, Post 650 |
| Recommended Investment |
Soldering: Pre solder using Gateway PdF solder without flux. Post solder using 650 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 1300F (704C) and hold for 1 hour plus ten minutes for each additional ring.
Melting and Casting: CONCORD 88 has a casting temperature of 2300F(1260C). 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: Casting may be blasted using 100-150 micron aluminum oxide. Shape and finish leaving a slihtly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1300F (704C) oven and raise temperature to 1750F (954C) WITH vacuum. Remove at once and bench cool. Remove oxide 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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