CeHa LIGHT CLASSIC

Type 4
white / Au 0.0 
copper-free

Composition: Pd 61.5 / Ag 24.5 / Sn 9.9 / Zn 2.0 /
In 2.0 / Ru 0.1
Standard: DIN EN ISO 22674 and DIN EN ISO 9693
Colour: white
Melting range °C: 1260–1180
Soft annealing: 15 mins at 900 °C / quench in water
Hardening: 15 mins at 600 °C / air
Preheating temperature °C: 850
Casting temperature °C: 1430°C (ceramic crucible!)
Further heating after melting (secs): electr.: 120–180
inductive: 10–15
flame: 10–15
Density g/cm3: 11.3
CTE 25°C–500°C (µm/mK): 14.2
CTE 25°C–600°C (µm/mK): 14.5
Soldering before firing: Cehadentor Ceramic solder 1110
Soldering after firing: Orplid solder CF 720, Orplid solder CF 860
Vickers hardness (HV 5/30): w: 260
a: 320
g/b: 310
0.2% proof stress (MPa): w: 583
a: 725
g/b: 620/600
Elongation at break (%): w: 19
a: 12
g/b: 13/18
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: 1430°C – possibly increase by 10°C–20°C for resistance-heated casting units. Ceramic crucible
Finishing: With carbide burs and/or ceramic-bonded stones. Always grind in one direction only! Sandblasting at a flat angle, using 110–125 µm aluminium oxide. Pressure should not exceed 2 ba
Cleaning: Steam jet cleaning or boiling in distilled water
Oxide firing: 10 mins at 950°C without vacuum. Afterwards, always clean in a preheated acid bath, e.g. Neacid, (for 10 mins) or sandblast with 50–125 µm aluminium oxide. Pressure should not exceed 2 bar. Clean thoroughly with a steam jet
Soldering before firing: Cehadentor Ceramic solder 1110
Soldering after firing: Orplid solder CF 720, Orplid solder CF 860
Firing: For normally expanding ceramic materials (e.g. CeHa WHITE® Classic)