MSDS Name: Magnesium oxide
Catalog Numbers: AC193430000, AC193430100, AC205150000, AC205150025, AC205155000, AC222530000, AC222531000, AC222535000, AC263830000, AC263830025, AC263835000, AC423890000, AC423890500, AC423895000, S80066, M300-500, M3494-500, M51-100, M51-500, M68-3
Synonyms: Magnesia.
Company Identification:
              Fisher Scientific
              1 Reagent Lane
              Fair Lawn, NJ 07410
For information, call: 201-796-7100
Emergency Number: 201-796-7100
For CHEMTREC assistance, call: 800-424-9300
For International CHEMTREC assistance, call: 703-527-3887

Section 4 - First Aid Measures

Eyes: Gently lift eyelids and flush continuously with water. If irritation develops, get medical aid.
Skin: In case of contact, flush skin with plenty of water. Remove contaminated clothing and shoes. Get medical aid if irritation develops and persists. Wash clothing before reuse.
Ingestion: If swallowed, do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Get medical aid.
Inhalation: If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician: Treat symptomatically and supportively.

Section 5 - Fire Fighting Measures

General Information: As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Substance is noncombustible. Magnesium oxide, as a fume, is produced when magnesium is burned in high-temperature processes or exposed to fire conditions.
Extinguishing Media: Use extinguishing media most appropriate for the surrounding fire.
Flash Point: Not available.
Autoignition Temperature: Not available.
Explosion Limits, Lower:Not available.
Upper: Not available.
NFPA Rating: (estimated) Health: 1; Flammability: 0; Instability: 0

Section 6 - Accidental Release Measures

General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks: Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions. Provide ventilation.

Section 7 - Handling and Storage

Handling: Wash thoroughly after handling. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Use with adequate ventilation. Avoid breathing dust and fume.
Storage: Store in a cool, dry place. Keep away from strong acids. Store protected from moisture.

Section 8 - Exposure Controls, Personal Protection

Engineering Controls: Use adequate general or local exhaust ventilation to keep airborne concentrations below the permissible exposure limits.
Exposure Limits

Chemical Name	ACGIH	NIOSH	OSHA - Final PELs
Magnesium oxide	10 mg/m3 TWA (inhalable fraction)	750 mg/m3 IDLH (fume)	15 mg/m3 TWA (total particulate)

OSHA Vacated PELs: Magnesium oxide: 10 mg/m3 TWA (total particulate)
Personal Protective Equipment
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
Skin: Glove protection is not normally required.
Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators: Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Section 9 - Physical and Chemical Properties

Physical State: Powder
Appearance: white
Odor: odorless
pH: 10.3 (saturated aq soln)
Vapor Pressure: 0 mm Hg @ 25 deg C
Vapor Density: Not available.
Evaporation Rate:Not available.
Viscosity: Not available.
Boiling Point: 3600 deg C
Freezing/Melting Point:2800 deg C
Decomposition Temperature:Not available.
Solubility: Very slightly .0086g/100ml
Specific Gravity/Density:3.58
Molecular Formula:MgO
Molecular Weight:40.30

Section 10 - Stability and Reactivity

Chemical Stability: Stable at room temperature in closed containers under normal storage and handling conditions. Absorbs carbon dioxide from the air. Hygroscopic: absorbs moisture or water from the air.
Conditions to Avoid: Dust generation, moist air, prolonged exposure to air.
Incompatibilities with Other Materials: Strong acids, interhalogens.
Hazardous Decomposition Products: None.
Hazardous Polymerization: Will not occur.

Section 11 - Toxicological Information

RTECS#:
CAS# 1309-48-4: OM3850000
LD50/LC50:
Not available.

Carcinogenicity:
CAS# 1309-48-4: Not listed by ACGIH, IARC, NIOSH, NTP, or OSHA.
Epidemiology: Controlled human exposure studies have demonstrated that ma gnesium oxide is less toxic than other metal oxide fumes o f the same aerodynamic particle size.
Teratogenicity: No data available.
Reproductive Effects: No data available.
Neurotoxicity: No data available.
Mutagenicity: No data available.
Other Studies: No data available.

Section 12 - Ecological Information

No information available.

Section 13 - Disposal Considerations

Chemical waste generators must determine whether a discarded chemical is classified as a hazardous waste. US EPA guidelines for the classification determination are listed in 40 CFR Parts 261.3. Additionally, waste generators must consult state and local hazardous waste regulations to ensure complete and accurate classification.
RCRA P-Series: None listed.
RCRA U-Series: None listed.

Section 14 - Transport Information

	US DOT	IATA	RID/ADR	IMO	Canada TDG
Shipping Name:	Not regulated				No information available.
Hazard Class:
UN Number:
Packing Group:

Section 15 - Regulatory Information

US FEDERAL

TSCA
CAS# 1309-48-4 is listed on the TSCA inventory.
Health & Safety Reporting List
None of the chemicals are on the Health & Safety Reporting List.
Chemical Test Rules
None of the chemicals in this product are under a Chemical Test Rule.
Section 12b
None of the chemicals are listed under TSCA Section 12b.
TSCA Significant New Use Rule
None of the chemicals in this material have a SNUR under TSCA.
SARA

CERCLA Hazardous Substances and corresponding RQs
None of the chemicals in this material have an RQ.
SARA Section 302 Extremely Hazardous Substances
None of the chemicals in this product have a TPQ.
Section 313
No chemicals are reportable under Section 313.
Clean Air Act:
This material does not contain any hazardous air pollutants. This material does not contain any Class 1 Ozone depletors. This material does not contain any Class 2 Ozone depletors.
Clean Water Act:
None of the chemicals in this product are listed as Hazardous Substances under the CWA. None of the chemicals in this product are listed as Priority Pollutants under the CWA. None of the chemicals in this product are listed as Toxic Pollutants under the CWA.
OSHA:
None of the chemicals in this product are considered highly hazardous by OSHA.
STATE
CAS# 1309-48-4 can be found on the following state right to know lists: California, New Jersey, Pennsylvania, Minnesota, Massachusetts.
California No Significant Risk Level: None of the chemicals in this product are listed.

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols:
Not available.
Risk Phrases:

Safety Phrases:
S 24/25 Avoid contact with skin and eyes.

WGK (Water Danger/Protection)
CAS# 1309-48-4: 1
Canada - DSL/NDSL
CAS# 1309-48-4 is listed on Canada's DSL List.
Canada - WHMIS
This product has a WHMIS classification of Not controlled..
Canadian Ingredient Disclosure List
CAS# 1309-48-4 is listed on the Canadian Ingredient Disclosure List.
Exposure Limits
CAS# 1309-48-4: OEL-ARAB Republic of Egypt:TWA 10 mg/m3 OEL-AUSTRAL
IA:TWA 10 mg/m3 JANUARY 1993 OEL-BELGIUM:TWA 10 mg/m3 JANUARY 1993
OEL-DENMARK:TWA 6 mg/m3 OEL-FRANCE:TWA 10 mg/m3 JANUARY 1993 OEL-G
ERMANY:TWA 6 mg/m3 OEL-GERMANY:TWA 6 mg/m3 JANUARY 1993 OEL-HUNGARY
:TWA 5 mg/m3;STEL 10 mg/m3 OEL-THE NETHERLANDS:TWA 10 mg/m3 JANUARY
1993 OEL-THE PHILIPPINES:TWA 15 mg/m3 JANUARY 1993 OEL-POLAND:TWA 1
5 mg/m3 OEL-RUSSIA:STEL 5 mg/m3 OEL-SWITZERLAND:TWA 6 mg/m3 OEL-SWI
TZERLAND:TWA 6 mg/m3;STEL 12 mg/m3 JANUAR 1993 OEL-TURKEY:TWA 15 mg/
m3 OEL-UNITED KINGDOM:TWA 10 mg/m3 JANUARY 1993 OEL-UNITED KINGDOM:
TWA 10 mg/m3 (total dust) OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA c
heck ACGIH TLV OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGI TLV

Section 16 - Additional Information

MSDS Creation Date: 12/12/1997
Revision #5 Date: 5/25/2004

The information above is believed to be accurate and represents the best information currently available to us. However, we make no warranty of merchantability or any other warranty, express or implied, with respect to such information, and we assume no liability resulting from its use. Users should make their own investigations to determine the suitability of the information for their particular purposes. In no event shall Fisher be liable for any claims, losses, or damages of any third party or for lost profits or any special, indirect, incidental, consequential or exemplary damages, howsoever arising, even if Fisher has been advised of the possibility of such damages.