MSDS Number: M0182 * * * * * Effective Date: 11/21/08 * * * * *
Supercedes: 01/16/06

MAGNESIUM OXIDE

1. Product Identification

Synonyms: Calcinated magnesia; Magnesia; Calcined Magnesite

CAS No.: 1309-48-4
Molecular Weight: 40.32

Chemical Formula: MgO
Product Codes:
J.T. Baker:
2476, 2480, 2484
Mallinckrodt: 12133, 5641, 6010, 6017, 6018

2. Composition/Information on Ingredients

Ingredient CAS No Percent Hazardous
--------------------------------------- ------------ ------------ ---------

Magnesium Oxide 1309-48-4 93 - 100% Yes

3. Hazards Identification

Emergency Overview
--------------------------

CAUTION! MAY CAUSE IRRITATION TO EYES AND RESPIRATORY TRACT.

SAF-T-DATA(tm) Ratings (Provided here for your
convenience)

-----------------------------------------------------------------------------------------------------------

Health Rating: 2 - Moderate
Flammability Rating: 0 - None

Reactivity Rating: 2 - Moderate
Contact Rating: 1 - Slight
Lab
Protective Equip: GOGGLES & SHIELD; LAB COAT & APRON; VENT HOOD;
PROPER GLOVES
Storage Color Code: Green (General Storage)

Potential Health Effects
----------------------------------

Inhalation:
Nuisance dust. May cause irritation to the
nasal passages, respiratory tract. Inhalation can cause a flu-like illness
(metal fume fever). This 24- to 48-hour illness is characterized by chills,
fever, aching muscles, dryness in the mouth and throat and headache.

Ingestion:
Magnesium oxide is slowly absorbed. Ingestion may
cause rapid bowel evacuation.
Skin Contact:
No adverse effects
expected.
Eye Contact:
May cause irritation.
Chronic
Exposure:
No information found.
Aggravation of Pre-existing
Conditions:
No information found.

4. First Aid Measures

Inhalation:
Remove to fresh air. Get medical attention
for any breathing difficulty.
Ingestion:
Give several glasses
of water to drink to dilute. If large amounts were swallowed, get medical
advice.
Skin Contact:
Wash exposed area with soap and water.
Get medical advice if irritation develops.
Eye Contact:
Wash
thoroughly with running water. Get medical advice if irritation develops.

5. Fire Fighting Measures

Fire:
Not considered to be a fire hazard.

Explosion:
Magnesium oxide reacts violently or ignites with
interhalogens such as chlorine trifluoride (ClF3) or bromine pentafluoride
(BrF5), and incandescently with phosphorus pentachloride (PCl5).
Fire
Extinguishing Media:
Use any means suitable for extinguishing
surrounding fire.
Special Information:
In the event of a fire,
wear full protective clothing and NIOSH-approved self-contained breathing
apparatus with full facepiece operated in the pressure demand or other
positive pressure mode.

6. Accidental Release Measures

Ventilate area of leak or spill. Wear appropriate personal
protective equipment as specified in Section 8. Spills: Sweep up and
containerize for reclamation or disposal. Vacuuming or wet sweeping may be
used to avoid dust dispersal.

7. Handling and Storage

Keep in a tightly closed container, stored in a cool, dry,
ventilated area. Protect against physical damage. Isolate from incompatible
substances. Containers of this material may be hazardous when empty since they
retain product residues (dust, solids); observe all warnings and precautions
listed for the product.

8. Exposure Controls/Personal Protection

Airborne Exposure Limits:
Magnesium Oxide:
- OSHA
Permissible Exposure Limit (PEL) -
15 mg/m3 (TWA).
- ACGIH Threshold
Limit Value (TLV) -
10 mg/m3 (TWA), Inhalable fraction, A4 Not classifiable
as a human carcinogen.
Ventilation System:
A system of local
and/or general exhaust is recommended to keep employee exposures below the
Airborne Exposure Limits. Local exhaust ventilation is generally preferred
because it can control the emissions of the contaminant at its source,
preventing dispersion of it into the general work area. Please refer to the
ACGIH document, Industrial Ventilation, A Manual of Recommended
Practices, most recent edition, for details.
Personal Respirators
(NIOSH Approved):
If the exposure limit is exceeded, a full facepiece
respirator with dust/mist filter may be worn up to 50 times the exposure limit
or the maximum use concentration specified by the appropriate regulatory
agency or respirator supplier, whichever is lowest. For emergencies or
instances where the exposure levels are not known, use a full-facepiece
positive-pressure, air-supplied respirator. WARNING: Air purifying respirators
do not protect workers in oxygen-deficient atmospheres.
Skin
Protection:
Wear protective gloves and clean body-covering clothing.

Eye Protection:
Use chemical safety goggles. Maintain eye wash
fountain and quick-drench facilities in work area.

9. Physical and Chemical Properties

Appearance:
Bulky white powder.
Odor:

Odorless.
Solubility:
Insoluble in water.
Specific
Gravity:
3.58 @ 25C (77F)
pH:
10.3
% Volatiles
by volume @ 21C (70F):
0
Boiling Point:
3600C (6512F)

Melting Point:
2800C (5072F)
Vapor Density (Air=1):

No information found.
Vapor Pressure (mm Hg):
No
information found.
Evaporation Rate (BuAc=1):
No information
found.

10. Stability and Reactivity

Stability:
Stable under ordinary conditions of use and
storage. Absorbs carbon dioxide and water from air.
Hazardous
Decomposition Products:
None known.
Hazardous
Polymerization:
Will not occur.
Incompatibilities:

Acids, interhalogens, phosphorus pentachloride, and chlorine trifluoride.

Conditions to Avoid:
Air, moisture, and incompatibles.

11. Toxicological Information

No LD50/LC50 information found relating to normal routes of
occupational exposure. Investigated as a tumorigen.

--------\Cancer Lists\------------------------------------------------------
---NTP Carcinogen---
Ingredient Known Anticipated IARC Category
------------------------------------ ----- ----------- -------------
Magnesium Oxide (1309-48-4) No No None

12. Ecological Information

Environmental Fate:
No information found.

Environmental Toxicity:
No information found.

13. Disposal Considerations

Whatever cannot be saved for recovery or recycling should be
managed in an appropriate and approved waste disposal facility. Processing,
use or contamination of this product may change the waste management options.
State and local disposal regulations may differ from federal disposal
regulations. Dispose of container and unused contents in accordance with
federal, state and local requirements.

14. Transport Information

Not regulated.

15. Regulatory Information

--------\Chemical Inventory Status - Part 1\---------------------------------
Ingredient TSCA EC Japan Australia
----------------------------------------------- ---- --- ----- ---------
Magnesium Oxide (1309-48-4) Yes Yes Yes Yes

--------\Chemical Inventory Status - Part 2\---------------------------------
--Canada--
Ingredient Korea DSL NDSL Phil.
----------------------------------------------- ----- --- ---- -----
Magnesium Oxide (1309-48-4) Yes Yes No Yes

--------\Federal, State & International Regulations - Part 1\----------------
-SARA 302- ------SARA 313------
Ingredient RQ TPQ List Chemical Catg.
----------------------------------------- --- ----- ---- --------------
Magnesium Oxide (1309-48-4) No No No No

--------\Federal, State & International Regulations - Part 2\----------------
-RCRA- -TSCA-
Ingredient CERCLA 261.33 8(d)
----------------------------------------- ------ ------ ------
Magnesium Oxide (1309-48-4) No No No

Chemical Weapons Convention: No TSCA 12(b): No CDTA: No
SARA 311/312: Acute: Yes Chronic: No Fire: No Pressure: No
Reactivity: No (Pure / Solid)

Australian Hazchem Code: None allocated.

Poison Schedule: None allocated.
WHMIS:
This MSDS
has been prepared according to the hazard criteria of the Controlled Products
Regulations (CPR) and the MSDS contains all of the information required by the
CPR.

16. Other Information

NFPA Ratings: Health: 1 Flammability: 0
Reactivity: 0
Label Hazard Warning:
CAUTION! MAY CAUSE
IRRITATION TO EYES AND RESPIRATORY TRACT.
Label Precautions:

Avoid contact with eyes, skin and clothing.
Avoid breathing
dust.
Use with adequate ventilation.
Wash thoroughly after
handling.
Keep container closed.
Label First Aid:
If
inhaled, remove to fresh air. Get medical attention for any breathing
difficulty. In case of contact, immediately flush eyes or skin with plenty of
water for at least 15 minutes. Get medical attention if irritation develops or
persists.
Product Use:
Laboratory Reagent.
Revision
Information:
No Changes.
Disclaimer:

************************************************************************************************

Mallinckrodt Baker, Inc. provides the information contained herein in
good faith but makes no representation as to its comprehensiveness or
accuracy. This document is intended only as a guide to the appropriate
precautionary handling of the material by a properly trained person using this
product. Individuals receiving the information must exercise their independent
judgment in determining its appropriateness for a particular purpose.
MALLINCKRODT BAKER, INC. MAKES NO REPRESENTATIONS OR WARRANTIES, EITHER
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE
INFORMATION SET FORTH HEREIN OR THE PRODUCT TO WHICH THE INFORMATION REFERS.
ACCORDINGLY, MALLINCKRODT BAKER, INC. WILL NOT BE RESPONSIBLE FOR DAMAGES
RESULTING FROM USE OF OR RELIANCE UPON THIS INFORMATION.

************************************************************************************************

Prepared by: Environmental Health & Safety
Phone Number:
(314) 654-1600 (U.S.A.)