MATERIAL SAFETY DATA SHEET







I        PRODUCT IDENTIFICATION



Trade Name:       Molybdenum Sulfide                                        Chemical Family:              Metal Sulfide

TSCA:             Listed in the EPA TSCA Inventory                          Formula:                      MoS2

Synonyms:         Molybdic sulfide, molybdnite, molybdenum disulfide, molybdenum (III) sulfide.





II       HAZARDOUS INGREDIENTS



                                             TLV: 5 mg/m3 (as Mo)                OSHA PEL: 5 mg/m3 (as Mo)

Molybdenum Sulfide %: 100

HMIS Hazard Rating: Health: 3                Flammability: 1                     Reactivity: 2         Personal Protection: J





III      PHYSICAL DATA



                                                                                                            2375 oC

Boiling Point:             Decomposes                                            Melting Point:

                                              o

Density (gm/cc):           4.80 at 14 Degrees C                                  Reaction with Water:       May form H2S

Appearance and Odor:       Black lustrous powder. Rotten-egg odor.               Solubility in H2O:         Insoluble

Other Comments:            Soluble in hot water, aqua regia, HNO3; Insoluble in dilute acid, concentrated H2SO4.





IV       FIRE AND EXPLOSION HAZARDS DATA



                                                                                 Autoignition Temp (oC): N/A

Flash Point (Method used): N/A

Flammability: LEL: N/A         UEL: N/A



Special Fire Fighting Procedures: Wear a self-contained breathing apparatus and full protective clothing to prevent contact with

skin and eyes.



Extinguishing Media: None

Unusual Fire and Explosion Hazards: Material may emit toxic fumes of SOx & H2S if involved in a fire or on contact with acids or

acidic fumes. Sulfides are moderate fire hazards when exposed to flame or by spontaneous chemical reaction. Many sulfides ignite

easily in air and at room temperature. Others require a higher temperature or the presence of an oxidizer. Upon contact with moisture

or acids, H2S is evolved. Many powerful oxidizers on contact with sulfides ignite vigorously.





V        HEALTH HAZARD INFORMATION



Toxicity Data: No data on this compound                                          MoO2 Data: scu-mus LD50: 318 mg/kg

Routes of Entry: Inhalation, Skin, and Ingestion.



Effects of Overexposure:



Inhalation: A respiratory irritant. Coughing, sneezing, difficulty breathing and pulmonary edema possible. May cause irritation of

the mucous membranes of the nose and throat.



Dermal: Inhalation, inflamation and redness possible. May cause dermatitis.

Eye: Irritation, inflammation, watering and redness possible. Risk of serious injury.

Other: The sulfides have variable toxicity. They cause softening and irritation of the skin. If taken by mouth they are corrosive and

irritating through the liberation of H2S and free alkali. H2S is especially toxic. Sulfides of the heavy metals are generally insoluble

and hence have little toxicity action except through the liberation of H2S. Molybdenum and its compounds are highly toxic based

upon chemical experimentations. But in spite of their considerable use in the industry, human industrial poisoning by molybdenum

inhalation has yet to be reported. Some studies have been made on its effects, and it is suggested that suitable precautions should be

taken against inhalation of significant amounts of the more soluble molybdenum compounds. Molybdenum is rapidly excepted by the

body. All molybdenum compounds can be recessed to molybdenum or to more toxic anions if present. A common air contaminant.



Medical Conditions Generally Aggravated by Exposure: Respiratory disorders.

Carcinogenicity: None          NTP: No         IARC Monographs: No                        OSHA Regulated: No



EMERGENCY AND FIRST AID PROCEDURES:



EYES: Flush eyes with lukewarm water for at least 15 minutes. Seek medical attention.

SKIN: Brush off skin, wash area with soap and water and seek medical attention.

INHALATION: Remove to fresh air; give oxygen if breathing is difficult and seek medical attention.

INGESTION: Give 1-2 cups of milk or water and induce vomiting. Seek medical attention.





VI       REACTIVITY DATA



Stability: Stable

Incompatibility (Material to Avoid): Potassium nitrate, violent reaction with H2O2.



Hazardous Decomposition Products: Mo, MoOx, SOx, S, H2S

Hazardous Polymerization: Will not occur

Conditions to Avoid: Heat, excessive moisture/water, incompatible materials.





VII      SPILL OR LEAK PROCEDURES



Steps to Be Taken in Case Material Is Released or Spilled: Wear a self-contained breathing apparatus and full protective clothing.

Isolate the area where the spill occurred, insure proper ventilation is available and that water/moisture are kept out of the area.

Vacuum up the spill using a high efficiency unit and place in a container for proper disposal.



Waste Disposal Method: Dispose of in a approved hazardous waste landfill.





VIII     SPECIAL PROTECTION INFORMATION



Respiratory Protection (Specify Type): Wear NIOSH-approved dust-mist-fume cartridge respirator.

Ventilation: Local Exhaust: Maintain exposure below TLV.                Mechanical: Recommended

Special: Handle in dry, controlled atmosphere.



Protective Gloves: Neoprene                                                Eye Protection: Safety Glasses

Other Protective Equipment: Wear protective clothing to prevent contamination of skin and clothes.





IX       SPECIAL PRECAUTIONS



Other Handling and Storage Conditions: Store in tightly closed container

Precautionary Labeling: Wash thoroughly after handling. Do not get in eyes, on skin or clothing. Do not breath dust, vapor, mist,

or gas. Keep container closed. Store in tightly closed containers. Empty container may contain hazardous waste residues. Poison.





Prepared by:      S. Dierks

Dated:            March 1993