Orplid LFC

Type 4**
deep yellow / Au 73.9 
palladium-free, copper-free

 

Composition: Au 73.9 / Ag 14.0 / Pt 8.0 / Zn 3.0 / Rh 0.6 /
Ta 0.4 / Ir 0.1
Standard: DIN EN ISO 22674 and DIN EN ISO 9693
Colour: deep yellow
Melting range °C: 1025-950
Soft annealing: 15 mins at 750 °C / quench in water
Hardening: 15 mins at 500 °C / air
Preheating temperature °C: 750
Casting temperature °C: 1180
Further heating after melting (secs): electr.: 20–30
inductive: 5–8
flame: 5–8
Density g/cm3: 16.6
CTE 25°C–500°C (µm/mK): 15.9
CTE 25°C–600°C (µm/mK): 16.3
Soldering before firing: Orplid Ceramic solder CF 950
Soldering after firing: Orplid solder CF 720
Vickers hardness (HV 5/30): w: 130
a: 200
g/b: 170
0.2% proof stress (MPa): w: 260
a: 505
g/b: 290/325
Elongation at break (%): w: 24
a: 15
g/b: 20/16
Spruing: Following the rules for dental applications (see General Instructions for Use)
Investment: Phosphate-bonded investment materials (Cehacast P or Cehacast Speed)
Preheating: 750 °C, 30 to 120 mins until end temperature, depending on size of mould
Casting: 1180 °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: 5 mins at 800°C–840°C without vacuum. Afterwards, always clean in an acid bath, e.g. Neacid, (for up to 5 mins) or sandblast with 50–125 µm aluminium oxide, at up to 2 bar pressure Clean (for 10 mins) in a preheated acid bath, e.g. Neacid, or sandblast with 50–125 µm aluminum oxide, at up to 2 bar pressure; clean with a steam jet
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); anneal for 15 mins at 500°C after glaze firing