Cehadentor Keramik SF3

Type 4
white / Au 51.5 
silver-free, copper-free

Composition: Au 51.5 / Ga 1.5 / Pd 38.4 / Ru 0.1 / In 8.5
Standard: DIN EN ISO 22674 and DIN EN ISO 9693
Colour: white
Melting range °C: 1310–1150
Soft annealing: 15 mins at 1100 °C / quench in water
Hardening: 15 mins at 600 °C / air
Preheating temperature °C: 850
Casting temperature °C: 1460
Further heating after melting (secs): electr.: 120–180
inductive: 10–15
flame: 10–15
Density g/cm3: 14.4
CTE 25°C–500°C (µm/mK): 13.8
CTE 25°C–600°C (µm/mK): 13.9
Soldering before firing: Orplid Ceramic solder 1110
Soldering after firing: Orplid solder CF 720
Vickers hardness (HV 5/30): w: 220
a: 290
g/b: 200/225
0.2% proof stress (MPa): w: 430
a: 590
g/b: 460/510
Elongation at break (%): w: 28
a: 17
g/b: 19/18
Spruing: Following the rules for dental applications (see General Instructions for Use)
Investment: Phosphate-bonded investment materials (Cehacast P or Cehacast Speed)
Preheating: 850 °C, 30 to 120 mins until end temperature, depending on size of mould
Casting: 1460 °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. Always grind in one direction only! Sandblasting at a flat angle, using 50–125 µm aluminium oxide. Pressure should not exceed 2 bar
Cleaning: Steam jet cleaning or boiling in distilled water
Oxide firing: 5 mins at 940°C without vacuum
Soldering before firing: Orplid Ceramic solder 1110
Soldering after firing: Orplid solder CF 720
Firing: For normally expanding ceramic materials (e.g. CeHa WHITE® Classic)