AURUMED Eco 38

Type 4
light yellow / Au 38.0 
copper-free

Composition: Au 38.0 /Ag 36.0 / Pd 17.0 / In 8.9 / Ir 0.1
Standard: DIN EN ISO 22674 und DIN EN ISO 9693
Colour: light yellow
Melting range °C: 1090-1000
Soft annealing: 15 mins at 750 ° C / quench in water
Hardening: 15 mins at 550 °C / air
Preheating temperature °C: 800
Casting temperature °C: 1230
Further heating after melting (secs): electr.: 20–30
inductive: 5–10
flame: 5–10
Density g/cm3: 12.9
CTE 25°C–500°C (µm/mK): 16.3
CTE 25°C–600°C (µm/mK): 16.5
Soldering before firing: Orplid Ceramic solder CF 950
Soldering after firing: Orplid solder CF 720
Vickers hardness (HV 5/30): w: 175
a: 225
g/b: 210/205
0.2% proof stress (MPa): w: 370
a: 520
g/b: 450/520
Elongation at break (%): w: 3.5
a: -
g/b: 3/2
Spruing: Following the rules for dental applications (see General Instructions for Use)
Investment: Phosphate-bonded investment materials 
Preheating: 800 °C, 30 to 90 mins until end temperature, depending on size of mould
Casting: 1230°C – possibly increase by 20°C–30°C for resistance-heated casting units. Use ceramic crucible (graphite crucibles also possible)
Finishing: With carbide burs and/or ceramic-bonded stones. Always grind in one direction only! Sandblasting at a flat angle, using 110–150 µm aluminium oxide. Pressure should not exceed 2 bar
Cleaning: Steam jet cleaning or boiling in distilled water
Oxide firing: 10 mins at 800°C without vacuum.
Soldering before firing: Orplid Ceramic solder CF 950
Soldering after firing: Orplid solder CF 720
Firing: For highly expanding ceramic materials