Composition:
Gold 86.2%
Platinum
11.5%
Zinc 1.5%
Balance Mn, Ru, Ta
Color: Yellow
Applications: CONCORD 86 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 | 2246F (1230C) |
| Melting Range | 1922-2066F (1050-1130C) |
| Density (gm/cc) | 19.0 |
| Vickers Hardness | 205 |
| Tensile Strength | 85,000 psi |
| Yield Strength | 72,500 psi |
| Elastic Modulus | 14,000,000 psi |
| Elongation(%) | 6 |
| TCE x 10-6/C(500C): | 14.3 |
Recommended
Processing:
| Recomended Solders | Pre YSF, Post 650 |
| Recommended Investment | PB |
Soldering: Pre solder using Gateway YSF 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 86 has a casting temperature of 2246F(1230C). 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 slightly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1100F (593C) oven and raise temperature to 1750F (954C) without vacuum at a heating rate of 100F/min (56C/min) and hold for 10 minutes. Remove at once and bench cool. Remove oxide with new 10-150 micron aluminum oxide. Clean in distilled water in ultrasonic cleaner for 10 minutes.
Opaquing: Follow porcelain manufacturer's instructions.
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