Health & Safety

Molybdenum MSDS

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Address: 540 Executive Drive, Willowbrook, IL 60527
Phone: Toll Free (800) 626-0226 * Fax (630) 325-3571
E-Mail: [email protected]
Trade Name: Molybdenum
Synonym: Molybdenum Metal Product
Chemical Family: Refractory metal
Formula/Chemical Symbol: Mo
Molecular Weight: 95.94
CAS #: 7439-98-7


Hazardous Component: Molybdenum
%: 0-100
OSHA/PEL 15 mg/m3
ACGIH/ TLV 10 mg/m3
HMIS Ratings(Solid): Health: 0 Flammability: 0 Reactivity: 0
HMIS Ratings(Powder): Health: 1 Flammability: 2 Reactivity: 1


Boiling Point: 5560 °C
Melting Point: 2610 °C
Specific Gravity: 10.2 g/cc
Vapor Pressure: N/A
Solubility in H2O: Insoluble
% Volatile: N/A
Appearance and Odor: Silver-white solid or gray-black powder, no odor.


Flash Point: N/A
Flammability: Flammable in powder form
Autoignition Temperature: N/E
Flammable Limits: Lower: N/A Upper: N/A
Extinguishing Media: For powder fires: Use special powder for metal fires. Do not use water. For fires involving solid forms: Use suitable extinguishing media for surrounding materials and type of fire.
Special Firefighting Procedures: Firefighters must wear a full face, self-contained breathing apparatus with full protective clothing to prevent contact with skin and eyes.
Unusual Fire and Explosion Hazards: Flammable in the form of dust or powder (below 9 microns), which may ignite during intensive mechanical treatment. When heated to decomposition, molybdenum may emit toxic metal oxide fumes. May have a violent reaction with oxidizing agents. Molybdenum oxidizes rapidly above 1000 oF in air at sea level. Dust/air mixtures may be explosive. Combines with oxygen on heating to form MoO3.


Effects of Exposure:
To the best of our knowledge the chemical, physical and toxicological properties of molybdenum have not been thoroughly investigated and recorded. Molybdenum compounds are poison by subcutaneous and intraperitoneal routes. Molybdenum and its compounds are highly toxic based upon animal experiments. Symptoms of acute poisoning include severe gastrointestinal irritation with diarrhea, coma, and deaths from heart failure. Experimental animals exposed to high levels accumulated Mo in the lungs, spleen, and heart, and showed a decrease of DNA and RNA in the liver, kidneys and spleen. (Sax, Dangerous Properties of Industrial Materials, eighth edition.)
Routes of Exposure: Dust, mist and/or fumes generated during physical or metallurgical treatment may be inhaled, swallowed or come in contact with the skin or eyes.
Acute Effects:
Inhalation: May cause irritation to the upper respiratory system.
Ingestion: May cause acute molybdenum poisoning.
Skin: May cause irritation.
Eye: May cause irritation.
Chronic Effects:
Inhalation: May cause pneumoconiosis, anemia, hyperthyroidism, abnormal liver function test, increased
susceptibility to gout.
Ingestion: May cause chronic molybdenum poisoning.
Skin: No chronic effects recorded.
Eye: No chronic effects recorded.
Target Organs: May affect the lungs, bones, spleen, respiratory system, nervous system, liver, blood, and heart.
Medical Conditions Aggravated by Exposure: Pre-existing lung disorders.
Carcinogenicity: NTP: No IARC: No OSHA: No


INHALATION: Remove to fresh air, keep warm and quiet, give oxygen if breathing is difficult and seek medical attention.
INGESTION: Give 1-2 glasses of milk or water and induce vomiting, seek medical attention. Never induce vomiting or give anything by mouth to an unconscious person.
SKIN: Remove contaminated clothing, brush material off skin, wash the affected area with mild soap and water. If irritation persists, seek medical attention.
EYE: Flush eyes, including under upper and lower eyelids, with lukewarm water. If irritation persists seek medical attention.


Stability: Stable
Conditions to Avoid: None
Incompatibility (Material to Avoid): Oxidizing agents, bromine trifluoride, chlorine trifluoride, fluorine, lead dioxide.
Hazardous Decomposition Products: Molybdenum, molybdenum trioxide, and other molybdenum oxide fumes.
Hazardous Polymerization: Will not occur.


Steps to Be Taken in Case Material Is Released or Spilled: Wear appropriate respiratory and protective equipment specified in section VIII. Ventilate area of the spill. Remove all sources of ignition. Clean-up using methods that avoid dust generation such as vacuuming (with HEPA filter), wet dust mop or wet clean-up.
Waste Disposal Method: Dispose of in accordance with Federal, State, and Local regulations.


Respiratory Protection: NIOSH approved respirator
Ventilation: Use local exhaust ventilation to control any air contaminants to within recommended limits during the use of this product. General exhaust is recommended.
Protective Gloves: Rubber gloves
Eye Protection: Safety glasses
Other Protective Clothing or Equipment: Protective gear suitable to prevent contamination.


Precautions to Be Taken in Handling and Storage: Store in a cool, dry area. Store powders and/or pieces in a tightly sealed container. Wash thoroughly after handling.

Work Practices: Implement engineering and work practice controls to reduce and maintain the concentration of exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in the work area. Wash thoroughly before eating and smoking. Do not blow the dust off clothing or skin with compressed air. Maintain eyewash capable of sustained flushing, safety drench shower, and facilities for washing.

TSCA Listed: Yes
DOT Regulations:
Solid Forms:
Hazard Class: None
Hazard Class: 4.1
Identification Number: UN3089
Packing Group: III
Proper Shipping Name: Metal (molybdenum)

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The above information is believed to be correct, but does not purport to be all-inclusive and shall be used only as a guide. shall not be held liable for any damages resulting from handling or from contact with the above product.