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Partial Denture Alloy

Physical Data

Melting Range 1320°c-1380°C (2408°F-2516°F) Casting Temp 1454°C (2650°F)
Hardness 330 HV CTE -
Yield Strength 96,000 PSI Tensile Strength 108,000 PSI
Elongation 6% Density 8,70 g/cm3
Specific Gravity 8,40 g/cm3

Section I

Material Identification

Chrome-Cobalt Base Partial Denture Alloy

Trade Name

None-Precious Alloy

Commercial Name


Section II

Ingredients & Hazards

Ingredients Cas # % Composition by weight
Cobalt (Co) (7440-48-4) 60-62%
Chromium (Cr) (7440-47-3) 28-30%
Molybdenum (Mo) (7439-98-7) 5-6%
Silicon (Si) (7440-21-3) <1%
Manganese (Mn) (7439-96-5) 1%
Iron (Fe) (7439-89-6) <1%
Carbon (C) (7440-44-0) 0.30-0.40%*
(*) 0.30% Carbon 330HV. ("Zaire" w/ regular hardness) (*) 0.40% Carbon 360HV ("Zaire" hard)

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 1320° – 1380° C (2408° - 2516° F)
Yield Strength 96,000 PSI
Tensile Strength 108,000 PSI
Elongation 6%
Density 8.70 (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.


Use investments for high-heat Chromium-Cobalt partial denture alloys only. Burnout at the temperatures and time recommended by the investment manufacturer or at a minimum of 1,850°F (1,010°C) for 1.5 hrs.


  1. Use a single-orfice tip or a multi-orfice tip.
  2. Set gauge at 20 psi oxygen and 8 psi acetylene.
  3. Give the spring-type casting arm three turns on an average casting.
  4. Place a sufficient amount of alloy in the preheated crucible.
  5. Heat the alloy evenly until the alloy begins to melt. At this point, drop a small amount of flux onto the heated metal to make the piece flow together. When the metal melts into a single mass, release the casting machine arm.
  6. Allow the casting arm to rotate for a minimum of twenty seconds. Then remove the mold and set it aside to bench cool.


It is crucial to follow the manufacturer's instructions in the operation of your specific equipment, due to the various types of induction machines available on the market (such as Manual, Semi-Automatic, and Fully Automatic, etc.). Exercise care in placing virgin metals or buttons in the crucible. Do not drop in ingots. Instead, use large tweezers to load the crucible, which will help prevent cracking of the crucible. For manual operators, when all the metal has melted together as one joined mass, release machine immediately to prevent overheating of the metal.


*Cut the sprues
*Trim remaining metal from sprues
*Clean up the inside of clasps and uprights with Taper Stone
*Grind or trim tight areas with an Inverted Cone
*Go over the entire case with a Small Barrel for polishing
*Sandblast and prepare for polishing


Use conventional electropolishing systems accepted and recommended for high-heat Chromium-Cobalt partial denture alloy only. Consult manufacturer's instructions and specifications for proper operating procedures. Rubber point all clasps and go over all surfaces that have been rubber wheeled.


When melting, grinding, or polishing alloy, use adequate ventilation, vacuum systems, protective eyewear, and protective masks and clothing.
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