MATERIAL SAFETY DATA SHEET 01620                               Pg. 1

Issued: 11/19/07

1.      Chemical Product and Contact Information

                                    Reagent Tungstate / Part Number:

     Product Name:

                                        Magnesium Oxide                     502-225

     LECO Corporation

     3000 Lakeview

     St. Joseph, Michigan 49085

     Information:      269-983-5531

     Chemtrec:         800-424-9300

     (Chemtrec Int'l: 703-527-3887)



2.      Composition/Information on Ingredients

                                    OSHA        ACGIH

Component             CAS No.       PEL (mg/m3) TLV (mg/m3)

Magnesium Oxide       1309-48-4      15(Fume)    10

Silver Tungstate      Not listed



3.      Hazard Identification

                                     EMERGENCY OVERVIEW

Handling in keeping with safe laboratory practices is recommended. Grey white granules.





Potential Health Effects

     EYES: Can be irritating.

     SKIN: Can be irritating.

     INHALATION: May be harmful if inhaled in large quantities as a dust.

     INGESTION: May be harmful if ingested in large quantities.

     MEDICAL CONDITIONS AGGRAVATED: Not available.

     CHRONIC OVEREXPOSURE: Not available.

     ACUTE OVEREXPOSURE: Not available.

     CARCINOGENICITY: None.









                                                                                 P/N: 502-225

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4.      First Aid Measures

     EYES: Immediately flush thoroughly with water for at least 15 minutes. Get medical assistance.

     SKIN: Wash thoroughly with soap and water. Get medical assistance.

     INHALATION: Remove to fresh air; give artificial respiration if breathing has stopped. Get

        medical assistance.

     INGESTION: If conscious, drink water and induce vomiting immediately as directed by medical

        personnel. Never give anything by mouth to an unconscious person. Get medical assistance.



5.      Fire Fighting Measures

     FLAMMABLE PROPERTIES: Non-flammable.

        Flash Point: None.               Method Used: Not applicable.

        Flammable Limits (% by Volume in Air):

               Lower: None.              Upper: None.

     AUTO-IGNITION TEMPERATURE: Not applicable.

     HAZARDOUS COMBUSTION PRODUCTS: None.

     EXTINGUISHING MEDIA: Use any suitable for adjacent material.

     FIREFIGHTING INSTRUCTIONS: Wear self-contained breathing apparatus.



6.      Accidental Release Measures

     SMALL SPILL: Wear appropriate protective clothing. Mix with sand and transfer to a container and

       arrange removal by disposal company Comply with federal, state, and local regulations on

       reporting releases.



7.      Handling and Storage

     HANDLING: Do not breathe dust or get in eyes, on skin or on clothing.

     STORAGE: Keep container closed. Store at controlled room temperature.



8.      Exposure Controls/Personal Protection

     ENGINEERING CONTROLS: Material should be handled or transferred in an approved fume hood

        or with adequate ventilation.

     RESPIRATORY PROTECTION: Wear appropriate respirator if needed.

     SKIN AND HAND PROTECTION: Protective gloves should be worn to prevent skin contact

        (neoprene or equivalent).

     EYE AND FACE PROTECTION: Safety glasses with side shields should be worn at all times.

     OTHER PROTECTIVE EQUIPMENT: Eye wash and safety equipment should be readily available.









                                                                                  P/N: 502-225

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9.       Physical and Chemical Properties

      APPEARANCE: Grey white granules.

      BOILING POINT: Not available.

      FREEZE-MELT POINT: Not available.

      VAPOR PRESSURE (mm): Not available.

      VAPOR DENSITY (air = 1): Not available.

      SOLUBILITY IN WATER: Insoluble.

      SPECIFIC GRAVITY: Not available.

      pH: Not available.

      PERCENT VOLATILES: Not available.

      EVAPORATION RATE (Butyl Acetate = 1): Not available.



10.      Stability and Reactivity

      CHEMICAL STABILITY: Stable.

      INCOMPATIBILITY: Avoid contact with acids. Reacts with ignition or incandescence with

         interhalogens or phosphorus pentachloride.

      HAZARDOUS DECOMPOSITION PRODUCTS: Not available.

      HAZARDOUS POLYMERIZATION: None.



11.      Toxicological Information

      Not available.



12.      Ecological Information

      Not available.



13.      Disposal Consideration

      Material does not have an EPA waste number and is not a listed waste, however consultation with a

         permitted waste disposal site (TSD) should be accomplished. Always contact a permitted waste

         disposer (TSD) to assure compliance with all current local, state and federal regulations.



14.      Transportation Information

      U.S.A. DOT: Not regulated.









                                                                                    P/N: 502-225

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15.      Regulatory Information



U.S. FEDERAL REGULATIONS:

   TSCA STATUS:            Magnesium Oxide is on the Toxic Substance Control Inventory.

   CERCLA REPORTABLE QUANTITY: None.

   SARA TITLE III:

      Section 302 Extremely Hazardous Substances:            None.

      Section 313 Toxic Chemicals:                           None.

   RCRA STATUS:            Not regulated.



CANADIAN REGULATIONS:

  Not regulated.



16.      Other Information





      Prepared By:



                     Jason Whitt



Information herein is given in good faith as authoritative and valid; however, no warranty, expressed

or implied can be made.









                                                                                 P/N: 502-225