Magnesium Silicide







Product Name:    Magnesium Silicide

Formula:             Mg2Si

Supplier:             ESPI Metals

                            1050 Benson Way

                            Ashland, OR 97520

Telephone:          800-638-2581

Fax:                     541-488-8313

Email:                  This email address is being protected from spambots. You need JavaScript enabled to view it.

Emergency:        Infotrac 800-535-5053 (US) or 352-323-3500 (24 hour)

Recommended Uses:   Scientific Research




GHS Classification (29 CFR 1910.1200): Substances and mixtures which, in contact with water, emit flammable gases, category 2.

GHS Label Elements:


Signal Word: Danger

Hazard Statements: H261  In contact with water releases flammable gas.

Precautionary Statements: P223  Do not allow contact with water,  P231+P232  Handle and store contents under inert gas, protect from moisture,  P280  Wear protective gloves/protective clothing/eye protection/face protection,  P302+P335+P334  IF ON SKIN:  Brush off loose particles from skin, and immerse in cool water,  P370+P378  In case of fire: Use Class D dry chemical extinguishing agent for extinction,  P402+P404  Store in a dry place. Store in a closed container,  P501  Dispose of contents/container in accordance with local, state or federal regulations.




Ingredient:        Magnesium Silicide

CAS#:                 22831-39-6

%:                      100

EC#:                   245-254-5

Common Names and Synonyms:  Dimagnesium silicide.




General Measures: Remove patient from area of exposure.

INHALATION: Remove to fresh air, keep warm and quiet, give oxygen if breathing is difficult. Seek medical attention.

INGESTION: Rinse mouth with water. Do not 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 affected area with soap and water. Seek medical attention if symptoms persist.

EYES: Flush eyes with lukewarm water, including under upper and lower eyelids, for at least 15 minutes. Seek medical attention if symptoms persist.

Most Important Symptoms/Effects, Acute and Delayed: May cause irritation. See section 11 for more information.

Indication of Immediate Medical Attention and Special Treatment: No other relevant information available.




Extinguishing Media: Use Class D dry powder extinguishing agent.

Unsuitable Extinguishing Media: Do not use water.

Specific Hazards Arising from the Material: May react with water under fire conditions liberating flammable gases. May emit toxic fumes under fire conditions.

Special Protective Equipment and Precautions for Firefighters: Full face, self-contained breathing apparatus and full protective clothing to prevent contact with skin and eyes.




Personal Precautions, Protective Equipment, and Emergency Procedures: Wear appropriate respiratory and protective equipment specified in section 8. Isolate spill area and provide ventilation. Avoid breathing dust or fume. Avoid contact with skin and eyes. Eliminate all sources of ignition. Avoid contact with water.

Methods and Materials for Containment and Cleaning Up: Avoid dust formation. Scoop up or vacuum using a vacuum equipped with a HEPA filter and place in a properly labeled closed container for further handling and disposal. Do not use water for clean-up.

Environmental Precautions: Do not flush to sewer, stream, or other bodies of water. Do not allow to enter drains or to be released to the environment.




Precautions for Safe Handling: Handle in an enclosed, controlled process. Avoid contact with water/moisture or acids and air. Keep away from sources of ignition; no smoking. Avoid creating dust. Provide adequate ventilation if dusts are created. Avoid breathing dust or fumes. Avoid contact with skin and eyes. Wash thoroughly before eating or smoking. See section 8 for information on personal protection equipment.

Conditions for Safe Storage, Including Any Incompatibilities: Store in tightly-sealed containers, under dry inert gas if possible. Storage containers should be properly labeled and kept in a cool, dry, well-ventilated area. Protect from water and moisture. Do not store together with acids. See section 10 for more information on incompatible materials.




Exposure Limits:     OSHA/PEL:                            ACGIH/TLV:

Magnesium Silicide     No exposure limit established    No exposure limit established

Appropriate Engineering Controls: Whenever possible the use of local exhaust ventilation or other engineering controls is the preferred method of controlling exposure to airborne dust and fume to meet established occupational exposure limits. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating or smoking. Do not blow dust off clothing or skin with compressed air.

Individual Protection Measures, Such as Personal Protective Equipment:

   Respiratory Protection: Wear a NIOSH/MSHA approved respirator when dusts or fumes are present.

   Eye Protection: Safety glasses

   Skin Protection: Wear impermeable gloves, protective work clothing as necessary.





  Form:                 Powder

  Color:                 Gray or black to blue

Odor:                    Not determined

Odor Threshold:  Not determined

pH:                                               N/A

Melting Point:                              1102 oC

Boiling Point:                               No data

Flash Point:                                 N/A

Evaporation Rate:                       N/A

Flammability:                              No data

Upper Flammable Limit:             No data

Lower Flammable Limit:             No data

Vapor Pressure:                          No data

Vapor Density:                            N/A

Relative Density (Specific Gravity):     1.99 g/cc

Solubility in H2O:                         Reacts

Partition Coefficient (n-octanol/water):   Not determined

Autoignition Temperature:         No data

Decomposition Temperature:     No data

Viscosity:                                     N/A




Reactivity: No specific test data available.

Chemical Stability: Stable under recommended storage conditions.

Possibility of Hazardous Reactions: Exposure to water at elevated temperatures can generate highly flammable gases. Magnesium silicide will decompose in dilute acids to produce silane gas, which is spontaneously combustible on contact with air.

Conditions to Avoid: Heat, water/moisture and air.

Incompatible Materials: Acids, oxidizing agents, water/moisture.

Hazardous Decomposition Products: Magnesium oxides, silicon oxides, silane gas.




Likely Routes of Exposure: Inhalation, skin and eyes.

Symptoms of Exposure: May cause irritation.

Acute and Chronic Effects:

Magnesium Compounds:  Inhalation of excessive concentrations of magnesium oxide fume may cause metal fume fever. Oral administration of magnesium salts may cause vomiting with few other effects unless, however evacuation fails, then mucosal irritation and absorption occur. Overexposure via oral, intravenous and intraperitoneal routes to magnesium (+2) salts may affect the central nervous, heart and respiratory systems.

Silicon Compounds:  Silicon dioxide is chemically and biologically inert when ingested, however heavy exposure to freshly formed silica fume may cause an acute reaction similar to metal fume fever. Silicon carbide is considered to be a nuisance particulate. Chlorosilanes, considered non-corrosive in their dry state, may become corrosive when in contact with water or moisture of skin and mucous membranes.

Acute Toxicity: No data

CarcinogenicityNTP:  Not identified as carcinogenic    IARC:  3 - Not classifiable as to its carcinogenicity to humans

To the best of our knowledge the chemical, physical and toxicological characteristics of the substance are not fully known.




Ecotoxicity: No data

Persistence and Degradability: No data

Bioaccumulative Potential: No data

Mobility in Soil: No data

Other Adverse Effects: Do not allow material to be released to the environment. No further relevant information available.




Waste Disposal Method:

Product: Dispose of in accordance with Federal, State and Local regulations.

Packaging: Dispose of in accordance with Federal, State and Local regulations.




UN Number:                           UN2624

UN Proper Shipping Name:   Magnesium Silicide

Transport Hazard Class:       4.3

Packing Group:                      II

Marine Pollutant:                   No




TSCA Listed:  Yes

DSL Listed:  No

Regulation (EC) No 1272/2008 (CLP):  Substances and mixtures which, in contact with water, emit flammable gases, category 2.

WHMIS 2015 Classification:  Substances and mixtures which, in contact with water, emit flammable gases, category 2.

HMIS RatingsHealth:  1     Flammability:  3     Physical:  2

NFPA RatingsHealth:  1     Flammability:  3     Instability:  2     Special Hazard:  W

Chemical Safety Assessment:  A chemical safety assessment has not been carried out.




The information contained in this document is based on the state of our knowledge at the time of publication and is believed to be correct, but does not purport to be all inclusive and shall be used only as a guide. ESPI Metals makes no representation, warranty, or guarantee of any kind with respect to the information contained in this document or any use of the product based on this information. ESPI Metals shall not be held liable for any damages resulting from handling or from contact with the above product. Users should satisfy themselves that they have all current data relevant to their particular use.


Prepared by:              ESPI Metals

Revised/Reviewed:    November 2017