Elfenbeingold G2

Type 4
pale yellow /Au 50.1

Composition:Au 50.1 / Cu 5.5 / Ag 30.9 / Zn 3.5 / Pd 9.9 / Ir 0.1
Standard:DIN EN ISO 22674
Colour:pale yellow
Melting range °C:970–870
Soft annealing:15 mins at 750 °C / quench in water
Hardening:15 mins at 350 °C / air
Preheating temperature °C:700
Casting temperature °C:1100
Further heating after melting (secs):electr.: 15–20
inductive: 5–8
flame: 5–8
Density g/cm3:13.4
Solders:Orplid solders 825, 790, 760
Vickers hardness (HV 5/30):w: 160
a: 260
g/b: 245
0.2% proof stress (MPa):w: 330
a: 670
g/b: 480
Elongation at break (%):w: 36
a: 19
g/b: 24
Spruing:Following the rules for dental applications (see General Instructions for Use)
Investment:Phosphate-bonded investment materials (Cehacast P or Cehacast Speed)
Preheating:700 °C, 30 to 120 mins until end temperature, depending on size of mould
Casting:1100 °C, possibly increase by 20°C–30°C for resistance-heated vacuum pressure casting. Graphite crucible or open flame with ceramic crucible.
Finishing:With carbide burs and/or ceramic-bonded stones
Cleaning:Ultrasonic cleaning or steam jet cleaning
Soldering:Orplid solders 825, 790, 760
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