Type 4
pale yellow /Au 50.1
Composition: | Au 50.1 / Cu 5.5 / Ag 30.9 / Zn 3.5 / Pd 9.9 / Ir 0.1 |
Standard: | DIN EN ISO 22674 |
Colour: | pale yellow |
Melting range °C: | 970–870 |
Soft annealing: | 15 mins at 750 °C / quench in water |
Hardening: | 15 mins at 350 °C / air |
Preheating temperature °C: | 700 |
Casting temperature °C: | 1100 |
Further heating after melting (secs): | electr.: 15–20 inductive: 5–8 flame: 5–8 |
Density g/cm3: | 13.4 |
Solders: | Orplid solders 825, 790, 760 |
Vickers hardness (HV 5/30): | w: 160 a: 260 g/b: 245 |
0.2% proof stress (MPa): | w: 330 a: 670 g/b: 480 |
Elongation at break (%): | w: 36 a: 19 g/b: 24 |
Spruing: | Following the rules for dental applications (see General Instructions for Use) |
Investment: | Phosphate-bonded investment materials |
Preheating: | 700 °C, 30 to 120 mins until end temperature, depending on size of mould |
Casting: | 1100 °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 |
Cleaning: | Ultrasonic cleaning or steam jet cleaning |
Soldering: | Orplid solders 825, 790, 760 |