Type 4
white / Au 75.0
Composition: | Au 75.0 / Pd 19.0 / In 2.0 / Sn 2.0 / Cu 0.4 / Ag 1.0 / Ir 0.05 / Zn 0.5 / Ru 0.05 |
Standard: | DIN EN ISO 22674 and DIN EN ISO 9693 |
Colour: | white |
Melting range °C: | 1230–1115 |
Soft annealing: | 15 mins at 800 °C / quench in water |
Hardening: | 15 mins at 550 °C / air |
Preheating temperature °C: | 850 |
Casting temperature °C: | 1380 |
Further heating after melting (secs): | electr.: 90–120 inductive: 10–15 flame: 10–15 |
Density g/cm3: | 16.1 |
CTE 25°C–500°C (µm/mK): | 13.9 |
CTE 25°C–600°C (µm/mK): | 14.3 |
Soldering before firing: | Orplid Ceramic solder 1020 / Orplid Ceramic solder 1070 (white) |
Soldering after firing: | Orplid solder 760 |
Vickers hardness (HV 5/30): | w: 125 a: 240 g/b: 220 |
0.2% proof stress (MPa): | w: 297 a: 605 g/b: 510/585 |
Elongation at break (%): | w: 35 a: 14 g/b: 17/19 |
Spruing: | Following the rules for dental applications (see General Instructions for Use) |
Investment: | Phosphate-bonded investment materials |
Preheating: | 850 °C, 30 to 120 mins until end temperature, depending on size of mould |
Casting: | 1380 °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 950°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 1020 / Orplid Ceramic solder 1070 (white) |
Soldering after firing: | Orplid solder 760 |
Firing: | For normally expanding ceramic materials |
Firing temperature of the ceramic material: | CeHa WHITE® CLASSIC: 20°C higher for opaquer firing |