CeHa LIGHT Plus

Type 4
pale yellow / Au 40.0
copper-free

Composition:Au 40.0 / Ag 35.9 / Pd 15.0 / In 9.0 / Ir 0.1
Standard:DIN EN ISO 22674 und DIN EN ISO 9693
Colour:pale yellow
Melting range °C:1050–985
Soft annealing:15 mins at 750 °C / quench in water
Hardening:15 mins at 550 °C / air
Preheating temperature °C:800
Casting temperature °C:1200
Further heating after melting (secs):electr.: 20–30
inductiv: 5–8
flame: 5–8
Density g/cm3:13.0
CTE 25°C–500°C (µm/mK):16.6
CTE 25°C–600°C (µm/mK):17.1
Soldering before firing:Orplid solder CF 950
Soldering after firing:Orplid solder CF 720
Vickers hardness (HV 5/30):w: 165
a: 230
g/b: 210/230
0.2% proof stress (MPa):w: 280
a: 580
g/b: 430/540
Elongation at break (%):w: 18
a: 7
g/b: 11/11
Spruing:Following the rules for dental applications (see General Instructions for Use)
Investment:Phosphate-bonded investment materials (Cehacast P or Cehacast Speed)
Preheating:800 °C, 30 to 120 mins until end temperature, depending on size of mould
Casting:1200°C – increase by 10°C–20°C for 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, applying minimal pressure; speed approx. 5000 rpm Sandblasting with 110–125 µm aluminium oxide. Pressure should not exceed 2 bar.
Cleaning:Steam jet cleaning or boiling in distilled water
Oxide firing:6 mins at 820°C without vacuum
Soldering before firing:Orplid Ceramic solder CF 950
Soldering after firing:Orplid solder CF 720
Firing:For highly expanding ceramic materials (e.g. CeHa WHITE® LF)
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