![[Translate to Englisch:] Legierungsblättchen Eco 52](https://www.c-hafner.de/fileadmin/user_upload/legierungen/c-hafner-legierungen-eco-52.jpg "[Translate to Englisch:] Legierungsblättchen Eco 52")
| Composition: | Au 52.0 / Ag 29.0 / Pd 12.5 / In 4.5 / Zn 1.4 / Sn 0.5 / Ir 0.1 |
| Standard: | DIN EN ISO 22674 and DIN EN ISO 9693 |
| Colour: | light yellow |
| Melting range °C: | 1080–970 |
| Soft annealing: | 15 mins at 800 °C |
| Hardening: | 15 mins at 500 °C |
| Preheating temperature°C: | 750 |
| Casting temperature °C: | 1200 |
| Further heating after melting(secs): | electr.: 20–30 inductive: 5–8 flame: 5–8 |
| Density g/cm3: | 14.0 |
| CTE 25-500 °C (µm/mK): | 16.5 |
| CTE 25-600°C (µm/mK): | 16.9 |
| Soldering before firing: | Orplid Keramik Lot CF 950 |
| Soldering after firing: | Orplid Lot CF 720 |
| Vickers hardness (HV 5/30): | w: 150 a: 235 g/b: 205/235 |
| 0.2% proof stress (MPa): | w: 325 a: 510 g/b: 440/570 |
| Elongation at break (%): | w: 12 a: 5 g/b: 6/6 |
| Spruing: | Following the rules for dental applications (see General Instructions for Use) |
| Investment: | phosphate bonded investings |
| Preheating: | 750 °C, 30 to 90 min at end temperature, corresponding to muffle size |
| Casting: | 1200 °C; if using resistance heated casters possibly increase on 20-30 °C. Graphite crucible resp. ceramic crucible. |
| Finishing: | with carbide milling and/or ceramic bonded abrasives. Take care to ensure always to use the same direction of rotation! Sandblasting with 110 -150 μm aluminium oxide particles. Pressure may not exceed 2 bar. |
| Cleaning: | clean with steam device or boil in distilled water. |
| Oxide firing: | 10 min at 800 °C with vacuum. Preferably, acidify for 10 - 15 minutes in a warm and clean neacid bath or carefully blast with 50 - 110 μm aluminium oxide. Finally, steam off thoroughly. |
| Soldering before firing: | Orplid Keramik Lot CF 950 |
| Soldering after firing: | Orplid Lot CF 720 |