Cehadentor 2

Type 4
yellow / Au 57.0

Composition: Au 57.0 / Pt 0.5 / Ag 24.9 / Zn 0.5 / Cu 13.0 / Ir 0.1 / Pd 4.0
Standard: DIN EN ISO 22674
Colour: yellow
Melting range °C: 930–870
Soft annealing: 15 mins at 750 °C / quench in water
Hardening: 15 mins at 450 °C / air
Preheating temperature °C: 700
Casting temperature °C: 1040
Further heating after melting (secs): electr.: 15–20
inductive: 5–8
flame: 5–8
Density g/cm3: 14.2
Solders: Orplid solders 825, 790, 760
Vickers hardness (HV 5/30): w: 170
a: 260
g/b: 260
0.2% proof stress (MPa): w: 365
a: 805
g/b: 785
Elongation at break (%): w: 40
a: 10
g/b: 12
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 min until end temperature, depending on size of mould
Casting: 1040 °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