INSTRUCTIONS

INVESTMENT
Only use investments such as Chromecast-XL, Chromecast-40, Chromecast-XF, or others which are acceptable and recommended for high-heat Chromium-Cobalt partial denture alloys. Consult the investment manufacturer's instructions and specifications for proper mixing and investing procedures. Burnout at the temperature and time recommended by the investment manufacture or at a minimum of 1,850 F (1, 010 C) for 1.5 hrs.

Torch Casting:
Steps:

1) Use a single-orifice tip comparable to a Linde #8 or a multi-orifice tip.

2) Set the gauges at 20-psi oxygen and 8 psi acetylene.

3) Light the torch and increase the acetylene and oxygen flow until you hear a hissing noise.

4) Using the acetylene valve, adjust torch so that the bright cone is approximately 1/8" {3mm) from the tip and the second inner cone approximately 1.5" (38mm) from the tip. Beyond this second tip will be the outer cone or brush flame.

5) If a spring type-casting machine is used, give the arm three and a half to four turns for an average casting.

6) Place sufficient alloy in a preheated crucible.

7) Apply the flame to the metal, keeping the inner cone (second larger cone) about 1.5" (38mm) from the metal. With a slight rotary motion, heat the alloy uniformly until the metal begins to melt. At this point, drop a pinch of flux onto the heated metal to make the pieces flow together. As soon as all the metal has melted into a single mass, release the casting machine arm.

8) Allow tile casting arn1 to rotate for a minimum of twenty seconds then stop the machine arm, remove the mold and set it aside to bench cool.

Induction Casting:
Because of the many types of induction machines on the market today (Manual, Semi-Automatic, Fully Automatic, etc.) it is necessary to follow the manufacturer's instructions as to the operation of your specific equipment. Exercise care in placing virgin metal or buttons in crucible. Do not drop ingots, but rather use large tweezers to load the crucible, which will help, prevent cracking of the crucible. For manual operations, when all the metal has melted and joined together as one mass, release machine immediately to prevent overheating of tile metal.

Finishing:
Steps:

1) Remove buttons by cutting the sprues close to the casting with a thin cut-off wheel.

2) Using a heavy cut-off wheel, trim remaining metal from sprues and shape to the case design.

3) Use a Large Barrel Stone (No.5) to grind the surface of lingual and palatal bars and shape the finish line areas on upper cases.

4) Clean up the inside of clasps and uprights with a Taper Stone (No. 3) and avoid grinding under the rest areas.

5) Trim or grind tight areas with an Inverted Cone (No.2).

6) After fitting the casting to the model go over the entire case with a Small Barrel Stone (No.1) which will prepare the surface for polishing.

7) Do not stone stippled surfaces. They should be electropolished or harperized and then high shined.

8) The casting should now be sandblasted and ready for polishing.

Conventional Electropolishing
Only use conventional electropolishing systems, which are acceptable and recommended for high-heat Chromium-Cobalt partial denture alloys. Consult the manufacture's instructions and specifications for proper operating procedures and chemical/ material requirements. Once conventional electropolishing is complete, remove case from the solution and rinse thoroughly in water. Areas that have been ground will require rubberizing to attain a smooth surface. Rubber wheel large areas, saddle areas, and finishing lines. Rubber point all clasps and go over all surfaces that have been rubber wheeled. On a low speed lathe (1750 RPM) attach a bristle brush and apply a pre-buff compound directly to the bristles. Go over the entire case in this manner to remove all surface marks left by the rubber point. Apply a high-shine compound to a felt wheel and a point to attain a brilliant finish and then clean the case ill an ultrasonic cleaner.

Acetylene/Oxygen Welding:
Steps:

1) Prepare the parts to be welded by grinding or sandblasting to a clean surface and then invest.

2) Thick areas should be ground to a "V" shape so that the top surface is wider than the bottom surface.

3) Adjust the gauges to 1 psi oxygen and 1 psi acetylene.

4) Light the torch and adjust to a neutral flame with approximately a 1/2" (12mm) blue cone extending from the torch tip.

5) Heat the end of the welding rod and dip it into the powdered flux (Not necessary when using paste f1ux).

6) Heat both parts to be welded and bring to an even cherry red color. Place the welding rod between the parts to be welded and proceed to melt.

7) Keep the torch about 1/2" (12mm) from the area to be welded.

Appliance Care:
For best appliance hygiene and care, clean frequently with ADA professionally recognized toothbrushes and ADA accepted dentifrices.

Properties:

Tensile Strength…………..…109,500 psi Yield
Strength ………………………98,000 psi
Percent of Elongation ……….6%
Liquidous temperature …….. 2500 F
Specific Gravity ……………...8.70
Modulus of Elasticity ………..26.1 x 10
Vickers Hardness.................(HV 10) 359