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 |
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 |