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Dental Ceramic Alloy

Physical Data

Melting Range 1360°c-1390°C (2480°F-2534°F) Casting Temp 1427°C (2600°F)
Hardness 340 HV CTE 14,0 *10-6 @25-600°C
Yield Strength 95,000 PSI Tensile Strength 140,000 PSI
Elongation 4% Density 8,70 g/cm3
Specific Gravity 8,02 g/cm3

Section I

Material Identification

Cobalt - Chromium Dental Ceramic Alloy

Trade Name

None-Precious Alloy

Commercial Name


Section II

Ingredients & Hazards

Ingredients Cas # % Composition by weight
Cobalt (Co) (7440-48-4) 61 - 63 %
Chromium (Cr) (7440-47-3) 20 - 22 %
Molybdenum (Mo) (7439-98-7) 5 - 6 %
Tungsten (7440-33-7) 8 - 10%
Silicon (Si) (7440-21-3) <1 %
Aluminum (Al) (7429-90-5) 1.5%
Niobium (7440-03-1) 1%
Manganese (Mn) (7439-96-5) 1%

Solid Form

  • Fire and explosion resistant
  • Insoluble in water
  • No odor
  • Non-toxic
  • In solid form no special precautions are required

Hazard Data

  • Chromium
  • Eight (8) hr. Tlv – 5 mg/m3
  • Molybdenum
  • Eight (8) hr. Tlv – 1 mg/m3
  • Silicon
  • Twa – 10 mg/m3

Technical Data

Melting Range 1360° – 1390° C (2480° - 2534° F)
Yield Strength 95,000 PSI
Tensile Strength 140,000 PSI
Elongation 4%
Density 8.7 (g/cm³)

Casting and Grinding

During casting and grinding avoid inhalation of fumes and dust. Exposure to large concentrations of dust may cause industrial dermatitis and respiratory tract irritation. Chronic exposure to Cobalt may cause pulmonary hypersensitivity.

Wear protective clothing. Melt, grind and polish in presence of adequate ventilation. Use respirator, goggles, gloves, coveralls, or protective clothing.

Although reasonable care has been taken in gathering information from the sources which we believe are reliable for preparation of this documents, we extend no warranties and make no representation as to the accuracy or completeness of the information contained, and assume no responsibility regarding suitability of this information for the user's intended purpose or for the consequences of its use.


Waxing procedure is very similar to the application of precious and semi-precious alloys. However, waxing could be as thin as 0.3 mm to 0.35mm.


A-Direct for single units. Sprueing should be ¼ (6mm) in length. Based on the size and the thickness of the crowns use 6-8 gauge sprues.

B-Indirect, for multiple units. Use straight 8 gauge sprue, about 1/8" (3 or 4mm) in length, and connect it to the unit. For long spanned bridges use an additional sprue connected to the last unit.


Use high heat investment; follow the manufacturer's instructions carefully. Use debubblizer. Use one-two ring liner. After investment has set, scrape the top of the investment to allow gases to escape.


Place the ring in the furnace at room temperature (or as high as 600 °F = 315 °C if needed) Increase the temperature to 1800 °F (982 °C) with one hour holding time. Add 10/15 extra minutes for each additional ring.


Use induction melting equipment or gas/oxygen torch. A-Torch casting: Use multiple orfice torch tips. Do not use crucible used for other alloys. Preheat the crucible. Move the torch allowing even distribution of heat. The individual ingots will not form a single mass. Release the casting arm as soon as the alloy starts to slump or sag. Bench cool the cast for about 5 minutes.

B-Induction Casting: Set the temperature to 2700 °F (1480 °C). Set the casting arm speed between 425 and 450 rpm.


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.


Sandblast the area bearing porcelain, and do not touch the area accepting porcelain, clean with ultrasonic cleaner. To degas the metal, place the metal work in a furnace at 1200 °F (650 °C): create a vacuum and increase the temperature 100 °F (38 °C) per minute to 1800 °F (980 °C). Release the vacuum and bench cool.


Follow manufacturers' instructions.
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