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