THE ARGEN CORPORATION
Alloy Specification Sheet
Norme BS EN ISO 22674
ARGENCO 58
Color: | YELLOW | ISO Type: | 3/4 | ADA Classification: | HIGH NOBLE (HN) | PGM: | 61.3% |
Metal Content %
Au | Pd | Ag | Ir | In | Cu | Zn |
58 | 3.25 | 27 | x | x | 10.49 | 1 |
'x' denotes a content of less than one percent
Thermal Properties
Melting
Range
|
Casting
Temperature
|
Density
g/cm3
|
1675-1770
ºF
|
1905
ºF
|
13.9
|
915-965 ºC
|
1040 ºC
|
Mechanical Properties
Vickers Hardness (VHN) |
Yield Strength N/mm2 (0.2% Offset) |
Modulus of Elasticity (GPa) |
Elongation % |
|||
83 |
||||||
Soft |
Hard |
Soft |
Hard |
Soft |
Hard |
|
145 |
210 |
290 |
550 |
28 |
10 |
PROCESS
|
INSTRUCTIONS
FOR USE
|
Modeling | Maintain a minimum wax thickness of 0.3 to 0.4 mm. |
Spruing (Single Crowns) | Use direct sprues, 8-10 gauge, (3.3-2.6 mm diameter) and 1/2 in. (12 mm) long with adequate reservoirs. There should be no more than 1/4 in. (6 mm) of investment from the top of the pattern to the top of the investment. |
Spruing (Multi-Units & Bridges) | Use a 6 gauge (4.1 mm diameter) runner bar, connecting the units to the bar with 10 gauge (2.6 mm diameter) sprues 1/8 in. (3 mm)long and joining the bar to the sprue base with 8 gauge (3.3 mm diameter) and 1/2in. (12 mm) long sprues coming from a domed central entry point. There should be no more than 1/4 in. (6 mm) of investment from the top of the pattern to the top of the investment. |
Alloy Quantity | 13.9g/cm3 * (Wax Weight) = Required Alloy Quantity. |
Investing | Use debubblizer and blow off any excess before investing. Do not preheat Cristobolite investment above 1290°F/700°C. Recommended Investment: Gypsum or Phosphate Bonded Follow the manufacturer's instructions. |
Burnout | After adequate set-up time, place the ring(s) in a room temperature oven and raise the temperature to 650-705 °C / 1200-1300 °F, hold for 1 hour plus 10 minutes for each additional ring. If you are using a rapid fire investment, follow the manufacturer's instructions. |
Reusing Cast Alloy | Use only clean buttons and at least 35 percent new alloy. |
Crucible Type | Graphite / Ceramic |
Torch Casting | Crown & Bridge Alloys can be cast with compressed air and natural gas using a borax flux for optimum results. |
Induction or Electrical Casting | For gold-based alloys, use a graphite lined crucible and a casting temperature of at least 212ºF/100°C over the liquidus temperature. Every casting machine is different. The casting temperature may require adjustment based upon the alloy and the amount of metal being cast. |
Cooling | Either allow the casting ring to cool to room temperature for self hardening, or quench the casting ring in water after the alloy glows dull red to soften. |
Divesting and Cleaning | Divest and sandblast with 50 micron aluminum oxide, be careful of margins. |
Pickling | Any gold pickling solution may be used for the gold-based alloys. |
Soldering | Check that the solder joints are sufficiently large (6-9 mm). Soldering gap approximately 0.05-0.2 mm. The soldering surfaces should be parallel and pre-polished. Allow the soldered case to cool slowly after soldering. |
Recommended Solder |
Use: LO,585, 720
|
Hardening | Heat Treat for 15 min. at 350°C / 660 ºF |
Softening | 1290°F/700°C. 15 min hold, Water Quench |
Laser Wire | LWO75 |
Polishing | Polish with any convential polishing brushes and felt wheels using Tripoli ,rouge and tin oxide. Soft, medium bristles, chamois, or rag wheels are acceptable. |
Print Date 12/9/2024