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)