Mercuric oxide

  • Mercury(II) oxide
  • Mercury monoxide
Formula
HgO
Structure
Description
Red or orange-red odorless, dense crystalline powder or scales, yellow when finely powdered.
Uses
Similar to that of the red oxide, fungicide.

Registry Numbers and Inventories.
CAS
21908-53-2
EC (EINECS/ELINCS)
244-654-7
EC Index Number
080-002-00-6
EC Class
very toxic, dangerous for the environment
R 26/27/28 33 50/53
S 13 28 45 60 61
RTECS
OW8750000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Reproductive Effector
UN (DOT)
1641
Merck
13,5908
Beilstein/Gmelin
13709 (G)
RCRA
D009
EPA OPP
52102
Swiss Giftliste 1
G-2828
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
HgO
Formula mass
216.58
Melting point, °C
> 400
Boiling point, °C
356.6
Decomposition point, °C
500
Vapor pressure, mmHg
701.968 (667.45 C)
Evaporization number
0.6 (butyl acetate=1)
Density
11 g/cm3
Solubility in water
Insoluble
Thermal expansion
0.00005802/K

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Wash clothing before reuse.
Protection
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: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. If sweeping is necessary, use a dust suppressant agent. Avoid generating dusty conditions. Provide ventilation.
Disposal code
20
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Chlorine, hydrazine hydrate, hydrogen peroxide, hypophosphorus acid, iodine + methyl and ethyl alcohol, magnesium, phospham, phosphorus, sodium + potassium, sulfur, reducing agents, easily oxidized materials, phosphinic acid.
Decomposition
Mercury/mercury oxides, oxygen.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Containers may explode when heated. Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Extinguishing media: Do NOT get water inside containers. Do NOT use straight streams of water. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use water spray, fog or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Slight fire hazard, by chemical reactions; an oxidizer.
Hazards
When heated to decomposition (932F) it decomposes into mercury and oxygen. Fumes from fire may contain poisonous mercury vapor; oxygen may increase intensity of fire. Explosion of mercuric oxide may occur with friction or application of heat. Avoid reducing agents. Avoid light; may decompose into mercury and oxygen.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: C 0.1 mg/m3 [skin] OSHA PEL: C 0.1 mg/m3 10 mg/m3 (as Hg)
Poison_Class
2
Exposure effects
Overexposure may cause delayed kidney injury. Prolonged or repeated skin contact may cause dermatitis. Prolonged or repeated exposure can cause psychic abnormalities such as anxiety, depression and excitability. May cause adverse nervous system effects including muscle tremors and incoordination. May cause reproductive and fetal effects.
   Ingestion
May be fatal if swallowed. May cause severe and permanent damage to the digestive tract. Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May cause kidney damage. Inorganic mercury compounds may cause central and peripheral nervous system effects.
   Inhalation
May cause respiratory tract irritation. May cause abdominal pain, nausea, vomiting, and inflammation of the gums and mouth. Acute exposure to high concentrations of mercury vapors may cause severe respiratory tract irritation. May cause liver damage.
   Skin
May cause mild skin irritation. Harmful if absorbed through the skin.
   Eyes
May cause eye irritation. Contact may cause ulceration of the conjunctiva and cornea.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately. Induce vomiting by giving one teaspoon of Syrup of Ipecac.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1641
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
MOX
 
HS Code
2825 90 50