Ethylmercurithiosalicylic acid, sodium salt

  • Thimerosal
  • Merthiolate sodium
Formula
C9H9HgNaO2S
Structure
Description
Slight odor.
Uses
Pharmaceutic aid (preservative), bactericide, fungicide.

Registry Numbers and Inventories.
CAS
54-64-8
EC (EINECS/ELINCS)
200-210-4
EC Index Number
080-004-00-7
EC Class
very toxic, dangerous for the environment
R 26/27/28 33 50/53
S 13 28.1 36 45 60 61
RTECS
OV8400000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Drug; Organometallic; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
2025
Merck
12,9451
Beilstein/Gmelin
NA
EPA OPP
78901
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C9H9HgNaO2S
Formula mass
404.81
Melting point, °C
232 - 233
Decomposition point, °C
232-233
Solubility in water
Slightly soluble

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from metals. Store protected from light.
Handling
Minimize dust generation and accumulation. Avoid breathing dust, vapor, mist, or gas. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. 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 protective 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
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Strong acids, strong bases, strong oxidizing agents.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide, mercury/mercury oxides, sodium oxide.

Fire.
Flash Point,°C
>250
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 irritating, corrosive and/or toxic fumes. Extinguishing media: Do NOT get water inside containers. 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
This material is probably combustible.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OEL-UNITED KINGDOM:TWA 0.05 mg(Hg)/m3;STEL 0.15 mg(Hg)/m3
Exposure effects
Effects may be delayed. Chronic exposure to mercury may cause permanent central nervous system damage, fatigue, weight loss, tremors, personality changes. Chronic ingestion may cause accumulation of mercury in body tissues. Chronic ingestion may result in salicylism which is characterized by nausea, vomiting, gastrointestinal ulcers, and hemorrhagic strokes. Reproductive effects have been reported in animals. Chronic exposure to mercury vapors may produce weakness, fatigue, anorexia, loss of weight and gastrointestinal disturbances which is collectively referred to as asthenic-vegetative syndrome or micromercurialism. Chronic exposure to mercury compounds may produce immunologic glomerular disease.
   Ingestion
Harmful if swallowed. May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause kidney damage. Mercaptans may cause nausea and headache. Exposure to high concentrations of mercaptans can produce unconsciousness with cyanosis, cold extremities and rapid pulse. May cause central nervous system effects and/or neurological effects. Human fatalities have been reported from acute poisoning.
   Inhalation
Causes respiratory tract irritation. May cause kidney damage. May cause allergic respiratory tract irritation. Exposure to high concentrations of mercaptans can produce unconsciousness with cyanosis, cold extremities and rapid pulse. Mercaptans may cause nausea and headache. Can produce delayed pulmonary edema. Acute exposure to high concentrations of mercury vapors may cause severe respiratory tract irritation. May cause central, peripheral, and autonomic nervous system effects.
   Skin
Causes skin irritation. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause erythema, and edema with crusting and scaling.
   Eyes
Causes eye irritation. May cause chemical conjunctivitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2025
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
HS Code
2930 90 70