Alloy Specification Sheet

Norme BS EN ISO 22674



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
915-965 ºC
1040 ºC

Mechanical Properties

Vickers Hardness (VHN)

Yield Strength N/mm2

(0.2% Offset)

Modulus of Elasticity







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 350C / 660 F

Softening 1290F/700C. 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 5/21/2024