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Properties
Category
PFM
Nobility
High Noble
Melting Range
2130°F to 2300°F
Coef. of Thermal Expansion
from 25°C to 500°C
from 25°C to 600°C
14.0x10
-6
K
-1
14.2x10
-6
K
-1
Density
16.6 g/cm
3
Grain Size
25 microns
Hardness
230 HV
Tensile Elongation
9%
Tensile Yield Strength
72,500 psi
Ultimate Tensile Strength
92,820 psi
Modulus of Elasticity
14.5x10
6
psi
Chemistry
Gold
74.5%
Palladium
15.2%
Silver
5.0%
Platinum
3.0%
Tin
2.3%
Rhenium
less than 1%
Ruthenium
less than 1%
Waxing / Spruing
.3mm for single units and .5mm for bridge work.
Investment
A phosphate-bonded investment with or without carbon.
Burnout
1400°F (760°C)
Melting / Casting
No extra winds of the casting arm are required (2-3 winds typical)
Multi-orifice torch:
10 psi fuel
and
20 psi oxygen
.
Cast at around 2400°F (1315°C)
Finishing
Finish with carbides or aluminum oxide stones. Blast porcelain receiving surface with non-recycled aluminum oxide. Clean in ultrasonic for 10 minutes.
Conditioning
Oxidize from 1200°F (650°C) to 1850°F (1010°C) in air. Hold for 5 minutes. Proceed with normal opaque technique.
Pre-solder
Recommended solder:
PWS, LX
Flux-Brown Fluoride
Post-solder
Recommended solder:
1400
Flux-Brown Fluoride
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