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Product Name: Mercurous Bromide
Chemical Formula: Hg2Br2
Synonyms: Mercury(I) bromide, Mercuric bromide (I)
CAS Number: 7789-67-5
Recommended Use: Laboratory chemical, research and development applications
Supplier Details: Reach out to your chemical distributor or laboratory supply company for current contact information, or consult the procurement documentation from your workplace for direct contact for emergencies or sourcing
Emergency Contact: Refer to local institutional emergency protocol, or national poison control centers such as the U.S. Poison Help line (1-800-222-1222)
GHS Classification: Acute toxicity (oral, inhalation, dermal: Category 2), specific target organ toxicity (repeated exposure: Category 2), hazardous to aquatic environment (acute and chronic: Category 1)
Signal Word: Danger
Hazard Statements: Fatal if swallowed, inhaled, or absorbed through skin; causes damage to organs through prolonged or repeated exposure; very toxic to aquatic life with long lasting effects
Precautionary Statements: Avoid all contact with skin, eyes, and clothing; use only in controlled environments; keep container tightly sealed; do not eat, drink, or smoke when handling
Potential Health Effects: Short-term exposure can bring about severe mercury poisoning, symptoms such as abdominal pain, vomiting, diarrhea, respiratory distress, dermatitis; long-term exposure linked to kidney damage, neurological symptoms including tremors, memory loss, irritability
Routes of Entry: Skin contact, inhalation, ingestion
Chemical Name: Mercurous Bromide
CAS Number: 7789-67-5
Purity: Typically over 98% for laboratory grade material
Impurities: Mercury(II) bromide may be present in trace amounts depending on synthesis, monitor with analytical methods such as X-ray diffraction or spectrophotometry; avoid introducing additional mercury compounds during handling
Other Components: No significant additives commonly used in standard preparations; verify batch-specific certificates of analysis before use in sensitive research activities
Inhalation: Move person to fresh air, support breathing with supplemental oxygen if available, monitor for respiratory distress or pulmonary edema; rapid onset of symptoms requires immediate medical attention.
Skin Contact: Remove contaminated clothing; rinse skin thoroughly with soap and large amounts of water for at least 15 minutes; obtain medical support even if no immediate symptoms appear.
Eye Contact: Immediately flush eyes with running water, gently lifting eyelids to remove particulates; keep rinsing for at least 20 minutes and seek urgent specialist care.
Ingestion: Seek emergency medical attention at once; do not induce vomiting unless instructed by medical personnel; rinse mouth thoroughly with water if conscious.
Advice for Medical Responders: Monitor for symptoms consistent with acute and chronic mercury poisoning, including renal and neurological effects; provide supportive care specific to patient’s clinical condition.
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, or foam extinguishers; avoid using water in direct stream due to risk of toxic runoff.
Hazards from Combustion: Mercury vapor forms at elevated temperatures; toxic, corrosive fumes of bromine and mercury compounds develop with strong heating.
Personal Protective Equipment for Firefighters: Full protective gear including breathing apparatus operated in positive pressure mode; ensure equipment is resistant to permeation by mercury compounds.
Special Precautions: Move containers away from fire zone; control contaminated runoff; ventilate affected area following extinguishing to clear vapors.
Personal Precautions: Evacuate area, isolate spill site, prohibit entry except for trained emergency responders equipped with chemical-resistant gear and respiratory protection; avoid creating dust or aerosol.
Environmental Precautions: Prevent spill from contaminating drains, soil, and surface waters due to high environmental toxicity of mercury compounds.
Clean Up Methods: Carefully collect solids and debris using non-sparking tools, place in sealed and labeled hazardous waste containers; decontaminate area with sulfur or zinc powder to bind mercury residues; ventilate space before reentry.
Notification: Report significant incidents to local environmental authorities as required by law.
Safe Handling: Limit handling to closed systems or approved fume extraction enclosures; wear impermeable gloves and chemical splash goggles; avoid mechanical shock or abrasion to containers.
Hygiene Measures: Clean hands thoroughly before eating, drinking, or smoking; prohibit personal items in handling areas; change protective clothing daily.
Storage Conditions: Store in tightly sealed, corrosion-resistant containers in a cool, dry, well-ventilated place away from acids, ammonia, or reducing agents; label all containers with hazard warning signs.
Storage Compatibility: Incompatible with oxidizers, strong acids, amines, metal powders; risk of hazardous decomposition or violent reaction with many common laboratory chemicals.
Occupational Exposure Limits: OSHA PEL for mercury compounds: 0.1 mg/m3 TWA as mercury vapor; ACGIH TLV: 0.025 mg/m3 as inorganic mercury compounds.
Engineering Controls: Ensure effective fume extraction at source; use closed systems and glove boxes for manipulation; install mercury vapor detectors in risk areas.
Personal Protective Equipment: Protective coveralls, nitrile or neoprene gloves, face shield or safety goggles, disposable shoe covers; P100 or better respiratory filters if vapor risk present.
Monitoring Methods: Environmental and biological monitoring recommended for long-term exposure scenarios; periodically assess using urine mercury or blood mercury levels.
Appearance: White crystalline powder or needles
Odor: Odorless
Molecular Weight: 561.08 g/mol
Melting Point: Decomposes at 237°C (459°F); does not melt cleanly
Boiling Point: Decomposes before boiling
Solubility (Water): Insoluble
Density: 7.18 g/cm3
Vapor Pressure: Negligible at room temperature
pH: Not applicable
Other Properties: Sensitive to light; decomposes slowly on exposure to air
Chemical Stability: Stable in sealed containers under dark, dry, low-humidity conditions; decomposes on exposure to strong light or moist air.
Reactive Conditions: Releases toxic mercury and bromine vapors when heated, shocked, or in contact with acids or ammonia.
Incompatibilities: Contact with oxidizers, acids, alkalis, amines, or metals such as aluminum can trigger violent reactions or hazardous decomposition.
Hazardous Decomposition: Produces mercury vapor, bromine gas, mercury(I) and mercury(II) compounds.
Polymerization: Does not undergo dangerous polymerization.
Acute Toxicity: Oral LD50 (rat): data unavailable, but mercury salts known for extremely low lethal doses; severe poisoning with minor exposures.
Skin & Eye Effects: Causes irritation, burns, risk of absorption through skin; can damage eye tissue with direct contact.
Chronic Effects: Cumulative mercury exposure may produce neurological decline – tremors, memory deficits, mood disorders; renal tubular damage; effects may be irreversible.
Carcinogenicity: Not classified by IARC or NTP, but mercury compounds considered potential human carcinogens by some regulatory bodies; handle all exposures as significant.
Sensitization: May cause dermatitis or allergic reactions in sensitive individuals.
Ecotoxicity: Acute aquatic toxicity rating is high; mercury compounds bioaccumulate, impact fish, aquatic invertebrates, and higher trophic levels; major persistent environmental risk.
Mobility in Soil: Poorly soluble; can persist, leach, or volatilize depending on local conditions; forms organomercury compounds in soil and water that move through ecosystems.
Biodegradability: Not biodegradable; long-term pollutant with stable chemical structure in nature.
Bioaccumulative Potential: Extreme; mercury salts concentrate in living tissues and can move up food chains, leading to widespread toxicity.
Other Harmful Effects: May impair microbial and plant growth in contaminated soils; restrict use where accidental discharge could occur.
Disposal Method: Treat as hazardous waste under all circumstances; use professional hazardous waste disposal services licensed to handle mercury-containing materials; do not incinerate or landfill with normal waste streams.
Container Management: Seal and label containers with chemical hazards; store pending disposal in assigned locked storage areas; prevent leaks or vapor release.
Local Regulations: Follow national (such as EPA in the US, or Hazardous Waste Directive in the EU) and state-specific rules for transport and disposal.
Additional Instructions: Decontaminate and monitor disposal equipment for residual mercury; keep complete records of disposal pathways and quantities.
Shipping Name: Mercury compounds, solid, n.o.s. (Mercurous Bromide)
UN Number: UN 2025
Hazard Class: Class 6.1 – Toxic substances
Packing Group: II
Transport Precautions: Ship in robust, tightly sealed, secondary-packaged containers; indicate proper shipping name and hazard on all external transport labels; restrict movement to authorized carriers; emergency response information accompanies shipment.
Special Provisions: Many countries set additional restrictions; avoid transport during extreme temperatures, ensure immediate access to spill response kits.
OSHA Regulations: Listed as a hazardous material; applies to worker training, engineering controls, exposure limits, and incident response rules.
EPA Status: Regulated as a hazardous substance under RCRA; Superfund regulations for spills; reporting threshold applies.
International Agreements: Rotterdam and Minamata Conventions list mercury and certain compounds for international control; many countries require notification or import permits.
EU Regulations: REACH Registration required for supply within the EU; CLP Regulation sets detailed classification and labeling standards.
State-Specific Rules: California Proposition 65 and similar regional laws list mercury compounds as reproductive toxins; consult local directives before any use or handling.
Worker Protection Rules: Medical surveillance and exposure recordkeeping often mandated in regulated workplaces; inform workers of hazards and train on emergency procedures.
