MSDS Material Safety Data Sheet


File Name: 21908-53-2.asp

                                         MATERIAL SAFETY DATA SHEET


Trade Name: Mercuric Oxide, Red Synonyms: Mercury II Oxide, Red
Chemical Family: Mercury Compounds Formula: HgO
CAS #: 21908-53-2


Weight: 90-100 %
Threshold Limit Value (TLV/TWA): 0.1 mg/m3
Short-Term Exposure Limit (STEL): Not established

Permissible Exposure Limit (PEL): 0.1 mg/m3 (PEL listed denotes ceiling limit.)
Toxicity of Components: Oral rat LD50 for Mercuric Oxide 18 mg/kg

SARA/Title III Hazard Categories and Lists:
Acute: Yes Chronic: Yes Flammability: No Pressure: No Reactivity: No

Extremely Hazardous Substance: Yes
CERCLA Hazardous Substance: Yes, contains mercury (RQ = 1 LB)
SARA 313 Toxic Chemicals: Yes, contains mercury.
Generic Class: Generic Class Removed from CFR: 7/1/91
TSCA Inventory: Yes


500 oC (932 oF at 760 mm Hg) Decomposes
Melting Point: Boiling Point: N/A
Solubility in H2O: Negligible (<0.1%) Specific Gravity: 11.1
0 (21 oC)
Evaporation Rate: 0.6 (Butyl Acetate = 1) % Volatiles by Volume:
Appearance and Odor: Orange to red powder. Odorless. Physical State: Solid


Flammable Limits: Upper: N/A Lower: N/A

Fire Extinguishing Media: Use extinguishing media appropriate for surrounding fire.
Special Fire Fighting Procedures: Firefighters should wear proper protective equipment and self-contained breathing apparatus with
full facepiece operated in positive pressure mode.

Unusual Fire and Explosion Hazards: Note: Decomposes at melting point. Can react violently with shock, friction or heat.
Toxic Gases Produced: Carbon monoxide, carbon dioxide, mercury fumes.
Explosion Data-Sensitivity to Static Discharge: None identified.

Route(s) of Entry: Inhalation? Yes Skin? Yes Eyes? Yes Ingestion? Yes Other? No

Health Hazards (Acute and Chronic):

Mercury is a general protoplasmic poison; after absorption it circulates in the blood and is stored in the liver, kidneys, spleen
and bone. In industrial poisoning, the principal effect is upon the central nervous system, the mouth, and gums. The cardinal
symptoms of mercury poisoning are stomatitis, tremors, and psychic disturbances. In humans, it is readily absorbed by the respiratory
tract, intact skin, and the gastrointestinal tract. Occasional incidental mercury may be without harm. Spilled and heated elemental
mercury is particularly hazardous. A number of mercury compounds, in addition to the fulminate, can cause skin irritation and be
absorbed through the skin. They are strong allergens and common air contaminants.

Inhalation: Acute: Danger-poison
Chronic: May cause mercury poisoning

Ingestion: Acute: Danger-poison
Chronic: May cause kidney damage and possibly death.

Skin: Acute: May cause irritation
Chronic: May cause dermatitis

Eye: Acute: May cause irritation
Chronic: May cause conjunctivitis.

Target Organs: May affect the skin, central nervous system, respiratory system, kidneys and eyes.

Signs and Symptoms of Exposure:

Inhalation: Mercury poisoning may cause stomitis, tremors, excessive salivation, pain when chewing, gingivitis with loosening of
the teeth, dark line on gums, psychic disturbances including loss of memory, insomnia, lack of confidence, irritation, vague fears and

Ingestion: Mercury poisoning may cause stomitis, tremors, excessive salivation, pain when chewing, gingivitis with loosening of the
teeth, dark line on gums, psychic disturbances including loss of memory, insomnia, lack of confidence, irritation, vague fears and

Skin: May cause redness, itching and inflammation.
Eyes: May cause redness, itching, burning, and watering.

Target Organs: Eyes, skin, respiratory system, central nervous system, kidneys.
Medical Conditions Generally Aggravated by Exposure: Allergies, Chronic respiratory disease, nerve system disorders, kidney

Other Mercury Toxicity Data:
orl-mus TDLO: 34 mg/kg (female 10D post): TER orl-rat LD50: 18 mg/kg
ims-rat LDLO: 22 mg/kg ipr-mus LD50: 4500 ug/kg
orl-rat TDLO: 10800 ug/kg (5D preg): REP skn-rat LD50: 315 mg/kg
orl-mus LD50: 16 mg/kg


INGESTION: CALL A PHYSICIAN. If swallowed, if conscious, immediately induce vomiting.
INHALATION: If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
SKIN CONTACT: In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contami-
nated clothing and shoes. Wash clothing before re-use.
EYE CONTACT: In case of eye contact, immediately flush with plenty of water for at least 15 minutes.

Stability: Stable
Hazardous Decomposition Products: Mercury fumes, carbon monoxide, carbon dioxide.

Hazardous Polymerization: Will not occur.
Incompatibles: Reducing agents, acetyl nitrate, butadiene+ethanol+iodine, chlorine+hydrogen, diboron tetrafluoride, hydrogen
peroxide+traces of nitric acid, non-metals, metals, hydrogen trisulfide, hydrazine hydrate, hypophosphorus acid. iodine+methanol or
ethanol, phospham, acetyl nitrate, SCl reductants.


Steps to Be Taken in Case Material Is Released or Spilled: Wear self-contained breathing apparatus and full protective clothing.
With clean shovel, carefully place material into clean, dry container and cover, remove from area. Flush spill area with water.

Waste Disposal Method: Dispose in accordance with all applicable Federal, State, and Local Environmental Regulations.
EPA Hazardous Waste Number: D009 (EP Toxic Waste)


Respiratory Protection: None required where adequate ventilation conditions exist. If airborne concentration exceeds TLV, a self-
contained breathing apparatus is advised.

Ventilation: Local Exhaust: To maintain concentration at or below PEL, TLV Other: None
Special: Handle in a controlled, enclosed process Mechanical: Not recommended

Eye/Skin Protection: Safety goggles, uniform, apron, proper gloves are recommended.
Ventilation: Use general or local exhaust ventilation to meet TLV requirements.

Work/Hygienic/Maintenance Practices: Implement engineering and work practice controls to reduce and maintain concentration of
exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly
before eating and smoking. Do not blow dust off of clothing or skin with compressed air.


Handling and Storage Conditions:

SAF-T-DATA* Storage Color Code: Blue (Health)
Storage Requirements: Keep product out of light. Keep container tightly closed. Store in secure poison area. Store in light-
resistant containers.

Transportation Data and Additional Information:

Domestic (DOT): International (IMO):
Proper Shipping Name: Mercuric oxide, solid Proper Shipping Name: Mercuric oxide, solid
Hazard Class: 6.1 Class: 6.1
UN/NA: UN1641 UN: UN1641
Labels: POISON Marine Pollutants: No
Regulatory References: 49CFR 172.101 IMO Page: 6167
Packaging Group: II Packaging Group: II
Labels: POISON

Transportation Data and Additional Information: Regulatory References: 49CFR PART 176; IMDG Code
Air (I.C.A.O.):
Proper Shipping Name: Mercuric oxide, solid
Hazard Class: 6.1
UN: UN1641
Labels: POISON
Packaging Group: II

US Cusoms Harmonization Number: 28259000000

NOTE: When handling liquid products, secondary protective containers must be used for carrying.

Issued By: S. Dierks
Dated: April 1994

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