NP Soft Ceramic Alloy
SKU:
Non-Precious Soft Ceramic Alloy
MELTING RANGE: 1,165 °C ~ 1,207 °C
ORDER CODE |
ITEM NO. |
UNIT OF MEASURE |
NP:SOFT-05 |
601-3105 |
5 ounces |
NP:SOFT-LB |
601-3101 |
1 pound (16 ounces) |
NP:SOFT-KG |
601-3102 |
1 kilo (2.2 pound) |
|
TECHNICAL DATA
|
COMPOSITION
|
CAUTION: This alloy contains Ni & Be, not to be used in individuals with Ni sensitivity. Inhalation of Be dust and fumes can be toxic, grind and polish with adequate ventilation, and wear protective clothing.
NOTE: For best results use at least 50% new metal with 50% sandblasted and cleaned buttons.
WAXING: Waxing procedure is very similar to the application of precious and semi-precious alloys. However, waxing could be as thin as 0.3mm.
SPRUEING: Direct for single unit. Based on the size and thickness of crowns use 6-8 gauge sprues. Indirect straight 8 gauge, about 1/8” (3 or 4 mm) in length, and connect to the unit.
INVESTING: Use high heat investments; Use debubblizer. Use one/two ring liner. After investment, let the gas escape by scrapping the top of the investment.
CASTING: Torch Casting : Use multiple orifice tips: Do Not use crucible used for other alloys. Move the torch to distribute heat evenly. Adjust oxygen regulators at approx. 25-30Lbs. Propane. Adjust valves until the inner flame cone is blue and approx. ½” long; the outside of the flame cone should be 3 ½” from the inner cone. Preheat the crucible. Release the casting arm when the ingots lose definition and puddle: molten ingots usually vibrate from the force of the flame. Bench cools the cast until the redness goes away. Induction Casting : Set temperature to 2700°F (1480°C). Set the casting arm speed between 425 and 450 rpm. When ingots pool together and shadow disappear, release the arm.
CLEANING: Sandblast the investing with pure non-recycled aluminum oxide. Do Not smooth the surface of the frame bearing porcelain. Use carbides, discs, diamonds and stones for metal finishing.
PREPARATION: Sandblast the area bearing porcelain, and do not touch the area accepting porcelain; clean with ultrasonic cleaner. De-gassing the metal is to achieve the desirable oxidation. Place the metal work in a furnace at 1200°F (650°C): create a vacuum and increase the temp. 100°F (38°C) per minute to 1900°F (1035°C); brake the vacuum and let it cool down.
OPAQUE &PORCELAIN APPLICATION: Bonding slurry must be applied to all surface bearing porcelain, apply slurry and dry it quickly in the over with open muffle; fire the slurry coating in ten degrees higher temp., as per instructions for opaque. Quicker method is using the same procedure without degassing. Try to complete opaque firing in a single step.
PORCELAIN APPLICATION: Follow the instructions of the ceramics manufacturers. Build up your porcelain and try to save extra firing.