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Product Name: Mercuric Sodium Thiosalicylate
Other Names: Thimerosal, Sodium ethylmercurithiosalicylate
Chemical Formula: C9H9HgNaO2S
CAS Number: 54-64-8
Recommended Use: Preservative in vaccines, antiseptics
Supplier Details: Chemical manufacturer or distributor information as supplied on packaging
Emergency Contact: Local Poison Control Center, Emergency services number, Manufacturer’s emergency line (see product labeling for numbers)
Classification: Acute toxicity (oral, dermal, inhalation); Skin sensitizer; Serious eye irritation; Specific target organ toxicity (repeat exposure), Environmental hazard (chronic aquatic toxicity)
Signal Word: Danger
Hazard Statements: Fatal if swallowed; Toxic in contact with skin; Causes skin allergy; Causes serious eye irritation; May damage the central nervous system, kidneys, or liver after prolonged exposure; Very toxic to aquatic life with long lasting effects
Pictograms: Skull and crossbones, Exclamation mark, Health hazard, Environment
Precautionary Statements: Wear gloves, protective clothing, and mask. Avoid inhaling dust or fumes. Do not let product reach drains or waterways. Handle with care in a fume hood.
Potential Health Effects: Dizziness, tremors, nephrotoxicity, respiratory discomfort, skin rashes, vision impairment
Component: Mercuric Sodium Thiosalicylate
Chemical Name: Sodium ethylmercurithiosalicylate
Concentration: Typically 99% pure
Impurities: Trace levels of sodium salts, possible thiosalicylic acid residues
Additives: None typically included
Inhalation: Move individual to fresh air immediately. Seek medical advice. Monitor for breathing difficulties, administer oxygen if trained.
Skin Contact: Remove contaminated clothing and rinse skin thoroughly with water and soap. Watch for signs of skin irritation or blistering. Obtain medical attention.
Eye Contact: Rinse eyes continuously for 15 minutes with running water, keeping eyelids open. Remove contact lenses if present.
Ingestion: Do not induce vomiting. Rinse mouth, provide water to dilute if conscious. Seek emergency medical attention. Symptomatic mercury poisoning can need chelation therapy.
Note to Physicians: Treat mercury exposure as a medical emergency, monitor kidney and neurological function, chelation with DMPS or DMSA may be indicated.
Suitable Extinguishing Media: Dry chemical, carbon dioxide, foam, or water spray. Prevent spill-over to environment.
Specific Hazards: Thermal decomposition releases toxic mercury vapors, sulfur oxides, sodium oxide, and salicylic acid fumes.
Protective Equipment for Firefighters: Full-body chemical suit, self-contained breathing apparatus (SCBA), gloves resistant to chemicals and heat.
Special Procedures: Evacuate area, control runoff, keep containers cool by spraying with water fog, avoid direct contact with material
Personal Precautions: Evacuate unnecessary personnel. Wear full PPE including gloves, chemical-resistant suit, goggles, and respirator.
Environmental Precautions: Prevent entry into waterways, drains, and soil. Notify authorities in case of significant spillage or environmental threat.
Containment: Absorb with inert material (sand, earth, diatomaceous earth). Collect residue and seal in labeled hazardous waste containers.
Clean-up: Scrub area thoroughly after removal, ventilate confined spaces, dispose of all cleaning materials as hazardous waste.
Handling: Use only in a chemical fume hood. Wear lab coat, chemical-resistant gloves, eyewear, and an appropriate respirator. Avoid all direct contact and inhalation. Do not eat, drink, or smoke while using this chemical.
Storage: Store in tightly closed, corrosion-resistant containers. Use clearly labeled, vented cabinets reserved for toxic chemicals. Keep away from heat, light, oxidizers, reducing agents, and moisture. Store at cool room temperature.
Incompatibilities: Strong acids, bases, oxidizers, reducing agents, ammonia, alkali metals
Occupational Exposure Limits: OSHA PEL for mercury compounds (0.1 mg/m³ as Hg, TWA); ACGIH TLV: 0.025 mg/m³ (skin notation)
Engineering Controls: Use fume hoods and local exhaust. Monitor air mercury levels in workspace regularly.
Personal Protection: Nitrile or viton gloves, splash goggles or face shield, full-sleeve chemical-resistant lab coat. Respiratory protection (P2 or P3 filter), especially if dust or aerosols likely.
Hygiene Measures: Wash hands and exposed skin thoroughly after handling, before eating or drinking. No eating, drinking, or cosmetics in work area.
Appearance: White to grayish powder or crystalline material
Odor: Slightly medicinal, no pronounced odor
Melting Point: Decomposes above 200°C (392°F)
Boiling Point: Decomposes before boiling
Solubility: Moderately soluble in water, more soluble in ethanol
Vapor Pressure: Negligible at room temperature
Density: Approximately 2.5 g/cm³
pH: 5.0–7.0 (10% aqueous solution)
Flash Point: Not flammable
Explosive Properties: Not classified as explosive, but hazardous by decomposition
Chemical Stability: Stable in sealed containers under dry, cool conditions. Decomposes with heat, moisture, or light exposure.
Reactivity: Reacts with reducing agents, strong acids and bases—may generate toxic gases.
Hazardous Decomposition Products: Mercury vapors, sodium oxide, sulfur oxides, phenolic compounds
Hazardous Polymerization: Will not occur
Incompatible Materials: Acids, alkalis, oxidizers, ammonia, aluminum, reducing agents
Routes of Exposure: Inhalation, ingestion, dermal, ocular
Acute Toxicity: LD50 oral (rat): ~75 mg/kg; LD50 dermal (rabbit): ~90 mg/kg
Chronic Effects: Cumulative mercury exposure impacts kidneys, nervous system, immune system. Sensitization possible even at low doses.
Symptoms: Tremors, memory loss, irritability, weight loss, proteinuria, rashes, photophobia
Carcinogenicity: Not classified as carcinogenic by IARC or NTP; chronic mercury compounds linked to neurological risk
Mutagenicity/Teratogenicity: No direct evidence in humans, but avoid exposure in pregnancy
Aquatic Toxicity: Highly toxic to aquatic species, bioaccumulates in food chains
Persistence and Degradability: Mercury compounds persist in water and sediment, salicylate residues degrade slowly
Mobility in Soil: Considerable mobility unless immobilized by organic matter
Bioaccumulation: High risk in aquatic organisms, mercury methylation in natural waters intensifies risk
Other Harmful Impacts: Long-term contamination, damage to fish reproduction and neurological development in wildlife
Disposal Methods: Handle as hazardous waste compliant with local, regional, and international regulations. Incineration in a specialized chemical incinerator with flue gas scrubber for mercury vapor recommended.
Container Disposal: Rinse disposable containers with neutralizing solvent, collect all washings as hazardous waste.
Special Precautions: Never flush to sewer or discard in regular trash. Transport in leakproof labeled containers. Coordinate with licensed hazardous waste disposal services.
UN Number: 2025
Proper Shipping Name: Mercury compound, organic, n.o.s. (Mercuric Sodium Thiosalicylate)
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: II
Label Requirements: Toxic, Environmentally Hazardous Substance
Special Precautions for Transport: Protect from physical damage and moisture. Securely seal and mark containers. Personnel should be trained in spill and leak response during transport. Documentation must be clear and accessible.
US Regulations: Listed under TSCA, SARA 313 (mercury compounds), RCRA (hazardous waste, U151); OSHA regulated as hazardous material; subject to CERCLA reporting for releases
EU Regulations: Classified as a mercury compound under REACH; restricted use in pharmaceuticals and preservatives; subject to Seveso III directive on dangerous substances
Other International Regulations: Covered by the Minamata Convention on Mercury. Varying restrictions apply to production, use, and disposal. Obligatory environmental reporting in many countries.
Labeling Requirements: Must display GHS hazard pictograms, warnings, and supplier identification.
