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MERCURIC OXIDE
ICSC: 0981
Peer-Review Status: 11.04.2014 Validated
Mercury (II) oxide
CAS #: 21908-53-2 RTECS #: OW8750000
UN #: 1641
EC #: 080-002-00-6
EINECS #: 244-654-7
    Formula: HgO
Molecular mass: 216.6

TYPES OF HAZARD
/ EXPOSURE
ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE-FIGHTING
FIRE Not combustible but enhances combustion of other substances. Gives off irritating or toxic fumes (or gases) in a fire.  NO contact with reducing agents.  In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION      
 
EXPOSURE   STRICT HYGIENE!   
Inhalation Cough. Sore throat.  Avoid inhalation of dust. Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness.  Wear safety goggles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Nausea. Vomiting. Diarrhoea.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Consult an expert! Personal protection: chemical protection suit. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT absorb in saw-dust or other combustible absorbents.  Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs.
Severe marine pollutant. 
EC Classification
Symbol: T+, N; R: 26/27/28-33-50/53; S: (1/2)-13-28-45-60-61; Note: A, 1 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: II 
GHS Classification
Signal: Danger
Fatal if swallowed
Toxic in contact with skin
May cause damage to kidneys
May cause damage to nervous system and kidneys through prolonged or repeated exposure
Very toxic to aquatic life with long lasting effects 
skull;toxiccancer;health hazenviro;aqua

EMERGENCY RESPONSE SAFE STORAGE
  Separated from food and feedstuffs, reducing agents, chlorine and reactive substances. See Chemical Dangers. Keep in the dark. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. Well closed. 

IMPORTANT DATA
Physical State; Appearance
YELLOW, ORANGE-YELLOW OR RED HEAVY CRYSTALLINE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes above 500°C . This produces highly toxic fumes including mercury and oxygen. This increases fire hazard. The substance is a strong oxidant. Reacts violently with reducing agents. Mixtures with metals and elements such as sulfur and phosphorus are shock-sensitive. 

Occupational exposure limits
TLV (as Hg): 0.025mg/m³ as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2013).
EU OEL (as Hg): 0.02 mg/m³ as TWA. 

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed. 

Effects of short-term exposure
The substance is mildly irritating to the eyes, skin and respiratory tract. The substance may cause effects on the kidneys. Medical observation is indicated. 

Effects of long-term or repeated exposure
The substance may have effects on the kidneys, central nervous system and peripheral nervous system. This may result in ataxia, sensory and memory disturbances, tremors, muscle weakness and kidney impairment. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at 500°C
Density: 11.1 g/cm³
Solubility in water, mg/l at 20°C: 50 (very poor) 
The substance is very toxic to aquatic organisms. Bioaccumulation of this chemical may occur in aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

NOTES
Depending on the degree of exposure, periodic medical examination is suggested.
Do NOT take working clothes home.
Red and Yellow mercuric oxide are common names.
Mercury is a common ingredient found in some skin lightening soaps and creams. Long-term use of such products may cause kidney damage, skin rashes, scarring, as well as anxiety, depression or psychosis and peripheral neuropathy. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
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    See Also:
       Toxicological Abbreviations