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Partial Denture Alloy

Physical Data

Melting Range 1194°c-1276°C (2181°F-2329°F) Casting Temp 1243°C (2450°F)
Hardness 340 HV CTE -
Yield Strength 122,000 PSI Tensile Strength 135,000 PSI
Elongation 7% Density 8.0 g/cm3
Specific Gravity 7.9 g/cm3

Section I

Material Identification

Nickel-Chromium Alloy

Material Name


Section II

Ingredients & Hazards

Ingredients Cas # % Composition by weight
Nickel (Ni) (7440-02-0) 72-74%
Molybdenum (Mo) (7439-98-7) 8-9%
Chromium (Cr) (7440-47-3) 12-14%
Aluminum (Al) (Cas 7429-90-5) 2%
Cobalt (Co) (7440-48-4) <1%
Titanium (Ti) (7440-32-6) <1%

Hazard Data

  • For pure Molybdenum (Fumes & Dust)
  • 8 hr. TLV-5mg/m³
  • Pure Nickel & Chromium (Fumes & Dust)
  • 8 hr. TLV- 1mg/m³
  • Ceiling level-5mg/m³
  • Max. for 30 Min.-25mg/m³
  • Silicon (Si)
  • 10mg/m³ (inhalable fraction) 6mg/m³ (alveolar fraction), Tasks/fields according to TRGS 900 Nr. 2.4 Abs. 8 and 9 3 mg/m ³ (alveolar fraction), other applications (common limit value for dusts) TRGS 900

Section III

Physical Data

Melting Range 2181º - 2329º F (1194 °-1276° C)
Appearance A silver/platinum color
Specific gravity 7.9 gm/cm³
Solubility in water None

Section IV

Fire & Explosion Data

These alloys are fire and explosion resistant

Section V

Reactivity Data

At high temperatures, these alloys will oxidize, but are stable. At very high temperatures, these alloys may produce fumes.

Section VI

Health Hazard Information

TLV (See Section II)
These alloys contain Nickel, Chromium, Molybdenum, Aluminum, Beryllium (1.8% Max.), and traces of Cobalt. University studies have established that alloys in these categories are not only biocompatible, but clinically safe as well. The alloy in solid form is generally not considered hazardous. Grinding, melting, cutting or any other process that releases dust or fumes can produce hazardous levels and should be avoided.

First Aid

Eye Contact Flush eyes Thoroughly with running water, even under eyelid.
Skin Contact Flush skin and scrub thoroughly with soap and water.
Inhalation Remove person to fresh air. Assist breathing with additional oxygen if necessary.

Section VII

Spill or Leak Procedures

Remove dust by vacuuming or wet sweeping to prevent powdering in the air. Wear respirators and protective clothing. Use disposable containers. No special precautions are required for bulk (solids) shapes, such as ingots and buttons.

Section VIII

Special Protection Information

General and local ventilation and exhaust filtration should be employed. Respirator, goggles, gloves, and coveralls or protective clothing should be used. Also, periodic physical examinations should be taken.

Section IX

Special Precautions

Avoid inhalation of fumes and dust. Avoid skin contact. Wear protective clothing. This alloy contains Beryllium. Beryllium dust can be toxic. Do not inhale. Grind and polish with adequate ventilation only. This alloy contains Nickel and should not be used for individuals with known Nickel sensitivity. Dust containing Nickel should not be inhaled. Melting and fabrication of this alloy should be done in the presence of adequate ventilation.

Additional Precautionary Notes

First Aid Measures

If dusts or smokes are inhaled, sufficient fresh air should be provided. In case of eye contact, eyes should be rinsed thoroughly for several minutes under running water. If ingested or swallowed, a doctor should be consulted immediately.

Fire Fighting Measures

The material is inflammable and not oxidizing. In case of large quantities of dust, the danger of a dust explosion is present. Toxic reaction products may occur by high temperatures. All extinguishing agents are suitable. Favorable are sodium chloride and dry sand.

Handling and Storage

By appropriate application, no special measures needed for handling or storage. Sufficient suction should be guaranteed.

Exposure Controls and Personal Protection

Respiratory protection can be maintained by ensuring suitable suction, and if applicable use respirator or filter. If necessary, use safety goggles for eye protection. Protective gloves can provide hand protection and prevent certain known allergies of alloy components, such as Nickel. During working with alloy and metals, do not eat, drink, smoke or snuff tobacco. Regarding legal instructions for working hygiene, wash face and hands before break and/or of work.

Stability and Reactivity

In case of contact with acids, the formation of hydrogen is possible. Dusts due to processing (e.g. casting, grinding) may cause dust explosions in extreme cases.

Toxicological Information

No dangerous reactions are known to occur with correct handling and storage.

Ecological Information

Normally chemical substances which accumulate as residual material, are special refuses. The removal is defined by legal waste management laws and corresponding regulations. In case of doubt, contact the public authorities. Prevention into soil, water, and drainage system.


Wax to a minimum of .3mm for single units and .5mm for bridge work. Avoid sharp angles and wax to provide for an even thickness of porcelain.


The indirect method is recommended. Use 6 or 8 gauge sprues for pontics and 10 gauge sprues for copings. Use a pre-made or hand formed runner bar. Sprue length should be precisely 1/4 inch.


A phosphate-bonded high heat investment without Carbon content is recommended. Follow the manufacturer's instructions for mixing powder and liquid. Cover the pattern with no more than 1/8" – ¼" of investment. Use a double ring liner. BURNOUT - Place in a cold furnace and raise to 1550ºF. Heat-soak at 1550ºF for one hour. Increase 5-10 minutes hold time for larger or multiple rings.


Use Induction Casting unit or Torch Casting (gas/oxygen). For torch casting use multiple orifice tips. Do not use acetylene torch. Do not use crucible used for another alloy. Keeps the torch moving in rotating motion for even distribution of heat on the ingots. Release the casting arm when the ingots lose definition and puddle. Induction Casting set the temperature to 2550ºF (1399°C). Set the casting arm speed between 425 and 450 rpm.


Follow the same procedure as for precious alloys. Sandblast the area bearing porcelain, and clean with ultrasonic.


Place the metal work in a furnace at 1200ºF (650ºC), create a vacuum and increase the temperature by increments of 100ºF (32ºC) per minute reaching it up to 1825ºF (996ºC), brake the vacuum and let it cool down.


Apply opaque in thin slurry. Fire the opaque slurry coating in ten degrees higher temperature. Quicker method is using the same procedure without degassing. Use opaque and porcelain manufacturer instructions.
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