Alfa 25 – Product Specification Sheet
Metal Content %
Pd Ag Ir Sn Zn
36.9 56 0,1 3,0 4,0
INSTRUCTIONS FOR USE
Modeling: Minimum wax thickness: 0.3 to 0.4 mm. No sharp corners. Lingual eyelet rings help support castings during firing.
Single Crowns: Use direct sprues, 8-10 gauge, (3.3-2.6 mm diameter) and 1/2 in. (12 mm) long with adequate reservoirs.
Multi-Units and Bridges: 10 gauge (2.6 mm diameter) sprues 1/8 in. (3 mm)long.
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: 10.9 g/cm3 * (Wax Weight) = Required Alloy Quantity.
Investing: Use debubblizer and blow off any excess before investing. Recommended Investment:Phosphate Bonded . Follow the manufacturer's instructions.
Burnout: Place the rings in a room temperature oven and raise the temperature to 800 °C / 1470 °F 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 50 percent new alloy.
Crucible Type: Ceramic
Torch Casting: Use either a natural gas/oxygen or a propane/oxygen torch with a multi-orifice tip. Ensure that the flame is on a natural setting when casting. The fuel proportions should be one-part fuel to two-parts oxygen
Induction or Electrical Casting: Use a ceramic crucible and a casting temperature of a least 1200°C. The casting temperature may require adjustment based upon the alloy quantity and the casting machine. Follow manufacturers instructions.
Cooling: Allow casting ring to cool to room temperature. DO NOT quench in water.
Divesting: Divest and sandblast with 50 micron aluminum oxide.
Finishing: Grind the metal surfaces for porcelain application with non-contaminating aluminum oxide stones in one direction. Blast with non-recycled 50 micron aluminum oxide. Do not exceed a blast pressure of 4 bars or 60 psi. Clean in distilled water in an ultrasonic cleaner for 10 minutes.
Degas: Degas at 700-800°C for a total of 5 minutes. The first 3 minutes should be in air and the final 2 minutes in vacuum. CAUTION! After this step avoid contact between the metal surface and fingers or other foreign object that could leave a contaminant deposit on the surface.
Presolder: Solder joints should be large (at least 5 mm²). Soldering gap about 0.05-0.2 mm. Invested units should be preheated and pressure blasted with 50 micron just before soldering.
Porcelain Application: Use only high expansion, low fusing porcelains especially adapted for universal alloys. Follow the recommendations of the porcelain manufacturer. For a better bond, fire a thin wash 10 - 15 °F (10 °C) above normal temperature, followed by regular opaque coats.
Post Soldering (After Firing): Solder joints should be large (at least 5 mm²). Soldering gap approximately 0.05 - 0.2 mm. Cover ceramically veneered units with wax before investing. The soldering investment should not come in contact with the ceramic.
Hardening: Heat Treat for app. 15 min. at 550°C
Recommended solder: Thor Light 700
Alldental Q & Co. AB CE 0413
120 06 STOCKHOLM
Tel. +46-(0)8-694 80 25
Fax +46-(0)8-694 80 26