CeHa MILL 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)