Alloy Specification Sheet – Elite NP
|
Color: |
WHITE |
Type: |
PFM,IV |
PGM: |
0% |
Composition
|
Mn |
Co |
Si |
Mo |
Cr |
Other |
|
1 |
59.5 |
2 |
5 |
31.5 |
1 |
'x' denotes a content of less than one percent.
Thermal Properties
|
Melting Range |
Casting Temperature |
Density g/cm3 |
|
|
|
|
|
2265-2460ºF |
2695ºF |
8.8 |
|
1240-1350 ºC |
1480 ºC |
Mechanical Properties
|
Vickers Hardness (VHN) |
Yield Strength N/mm2 (0.2% Offset) |
Tensile Strength N/mm2 |
Elongation % |
Co-Eff. of Expansion ( um/m-ºC ) |
||||||
|
A.F. |
Soft |
Hard |
Soft |
Hard |
Soft |
Hard |
Soft |
Hard |
25 - 500 |
25 - 600 |
|
280 |
|
280 |
|
450 |
|
765 |
|
9 |
14.3 |
14.8 |
|
PROCESS |
INSTRUCTIONS FOR USE |
|
Modeling |
Maintain a minimum wax thickness of 0.3 to 0.4 mm. The wax pattern design should have lingual collars and no sharp corners. Lingual eyelet rings help support castings during firing. |
|
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. |
|
Investing |
Use debubblizer and blow off any excess before investing. Recommended Investment: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 870°C plus 10 minutes for each additional ring. If you are using a rapid fire investment, follow the manufacturer's instructions. |
|
Crucible Type |
Quartz or Zircon |
|
Torch Casting |
Wind the casting machine one more turn than you would for precious ceramic alloys. A quartz or zircon crucible is necessary. Use a propane/oxygen torch with a multi-orifice tip. Do not use flux. Place the alloy (at least 50% new metal) in a pre-heated crucible. Keep the torch moving to heat all the metal in the crucible at an even rate. The individual ingots will not pool together to form a single mass. Do not stir or rupture the oxide surface. When the flame appears to move the alloy, cast. After casting bench cool before devesting. |
|
Induction or Electrical Casting |
When using induction casting machine, pre-heat the crucible. Set the arm speed to 400-450 rpm & set the power to high and be sure that the alloy is pulsating and slumping. The casting temperature of automatic casting equipment should be set for 2700°F (1480°C) with a five seconds heat soak. |
|
Cooling |
Allow casting ring to cool to room temperature. DO NOT quench in water. |
|
Divesting and Cleaning |
Divest and sandblast with 50 micron aluminum oxide, be careful of margins. |
|
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. |
|
Oxydizing or Degassing |
650-980°C, no hold, Removal of oxide optional, Vacuum |
|
Presolder |
Solder joints should be as large as possible (at least 5 mm²). Soldering gap approximately 0.05-0.2 mm. The solder joints should be parallel and free of debris. Preheat invested units and pressure blast with 50 micron just before soldering. Use: P,NP,Flux-N-Sol INTERNATIONAL / DOMESTIC |
|
Porcelain Application |
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 as large as possible (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. The soldering surfaces should be parallel, smooth and free of debris. Use: LO, R INTERNATIONAL / DOMESTIC |
|
Polishing |
Use Tripoli and rouge or other similar products. |