Orplid C

Type 4
yellow / Au 75.0 
palladium-free, copper-free

Composition:Au 75.0 / Rh 0.9 / Ag 12.5 / Ta 0.4 / Pt 9.1 /
Ir 0.1 / Zn 2.0
Standard:DIN EN ISO 22674 and DIN EN ISO 9693
Colour:yellow
Melting range °C:1060–995
Soft annealing:15 mins at 750 °C / quench in water
Hardening:15 mins at 500 °C / air
Preheating temperature °C:700
Casting temperature °C:1210
Further heating after melting (secs):electr.: 15–20
inductive: 5–8
flame: 5–8
Casting crucible:Graphite/ceramic
Density g/cm3:17.0
CTE 25°C–500°C (µm/mK):15.0
CTE 25°C–600°C (µm/mK):15.5
Soldering before firing:Orplid Ceramic solder C 970
Soldering after firing:Orplid solder CF 720
Vickers hardness (HV 5/30):w: 115
a: 205
g/b: 165/200
0.2% proof stress (MPa):w: 210
a: 455
g/b: 270/435
Elongation at break (%):w: 18
a: 10
g/b: 15/12
Spruing:Following the rules for dental applications (see General Instructions for Use)
Investment:Phosphate-bonded investment materials (Cehacast P or Cehacast Speed)
Preheating: 700 °C, 30 to 120 mins until end temperature, depending on size of mould
Casting:1210 °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:3 mins at 860°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:Orplid Ceramic solder C 970
Soldering after firing:Orplid solder CF 720
Firing:For highly expanding ceramic materials (e.g. CeHa WHITE® LF, Carrara Vincent)
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