Product Name: Dibromomethane
Chemical Formula: CH2Br2
Synonyms: Methylene dibromide, Methylenebromide
CAS Number: 74-95-3
UN Number: 2663
Recommended Use: Laboratory solvent, chemical synthesis intermediate
Supplier Details: Manufacturer contact information and emergency phone numbers always appear on the commercial label, often with a 24-hour emergency line for chemical spills or exposures.
Classification: Acute toxicity (oral, dermal, inhalation), Eye irritation, Skin irritation
Label Elements: Skull and crossbones symbol, exclamation mark, health hazard indication
Signal Word: Danger
Hazard Statements: Toxic if inhaled or swallowed, causes serious eye irritation, causes skin irritation, may cause damage to organs after prolonged exposure
Precautionary Statements: Avoid breathing vapors, use only outdoors or in a well-ventilated area, wear protective gloves and eye protection, wash hands after handling, do not eat or drink while using this substance
Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Target Organs: Central nervous system, liver, kidneys
Chemical Name: Dibromomethane
Purity: Typically above 99%
Impurities: Trace quantities of related halogenated methanes sometimes appear, depending on grade
Other Additives: None typically introduced
Ingredient Percentage: 100% dibromomethane by weight in most commercial and laboratory supplies
Inhalation: Move person to fresh air immediately, maintain unobstructed breathing, seek medical attention straight away
Skin Contact: Wash area thoroughly with soap and water, remove contaminated clothing, watch for any unusual symptoms on the skin such as redness or blistering
Eye Contact: Rinse gently under plenty of water for at least 15 minutes, keep eyelid open, see a physician as soon as possible
Ingestion: Rinse mouth with water without swallowing, do not induce vomiting, consult a doctor without delay
Other Notes: Always provide medical personnel with a copy of this safety data sheet after exposure, since dibromomethane toxicity can manifest with delayed symptoms
Suitable Extinguishing Media: Carbon dioxide, dry chemical, alcohol-resistant foam; water spray for larger fires
Unsuitable Media: Direct stream of water may scatter the material
Specific Hazards: Produces toxic and corrosive fumes under heat or fire, including hydrogen bromide and carbon oxides
Protective Equipment: Firefighters should wear full chemical protective suit with self-contained breathing apparatus
Additional Instructions: Cool fire-exposed containers by spraying water from a distance to avoid pressure build-up, block off run-off to prevent entry into drains or sewers
Personal Precautions: Evacuate unprotected personnel, ventilate affected area, avoid inhalation and direct contact with liquid
Environmental Precautions: Prevent spillage from entering drains, surface water, or soil
Containment Methods: Absorb with inert materials such as sand or vermiculite, transfer to closed chemical waste containers
Cleanup Methods: Wear appropriate PPE, clean up promptly using approved methods, ventilate area thoroughly after cleaning up
Disposal: Dispose of through a licensed hazardous waste contractor according to local regulations
Handling: Work with proper engineering controls such as fume hoods, avoid direct handling without gloves, practice good hygiene measures after handling
Storage: Store in tightly closed containers in a cool, dry, and well-ventilated place away from heat or open flames
Incompatibilities: Avoid contact with strong bases and oxidizers, do not store near food, feed, or water sources
Storage Life: Containers should be clearly labeled and routinely checked for leakage or deterioration
Occupational Exposure Limits: ACGIH TLV: 0.5 ppm (for similar compounds), OSHA PEL: not established directly for dibromomethane
Eye Protection: Chemical safety goggles with side shields
Skin Protection: Use nitrile rubber or neoprene gloves, lab coat or apron
Respiratory Protection: Use NIOSH-approved respirators if ventilation is insufficient or exposure limits are exceeded
Ventilation: Operate under a chemical fume hood, maintain good general ventilation at all times
Hygiene Measures: Wash skin thoroughly after handling, do not smoke, eat, or drink in work areas
Physical State: Colourless liquid
Odor: Sweet, chloroform-like smell
Melting Point: -52°C
Boiling Point: 97°C
Density: 2.477 g/cm³ at 20°C
Solubility: Slightly soluble in water, fully miscible with ethanol, ether, chloroform
Vapor Pressure: 38 mm Hg at 25°C
Vapor Density: 6.03 (air = 1)
Flash Point: Not flammable (closed cup)
Autoignition Temperature: Not applicable
Partition Coefficient (log Pow): 1.68
Chemical Stability: Stable under recommended storage and handling conditions
Hazardous Reactions: May react strongly with alkali metals, powdered metals, or strong bases
Decomposition Products: Releases hydrogen bromide, bromine, carbon monoxide, and carbon dioxide at high temperatures or if incinerated
Polymerization: Does not polymerize
Other Notes: Avoid exposing to strong light or excessive heat as this can increase breakdown and hazard
Routes of Entry: Absorption through skin, inhalation, ingestion
Acute Toxicity: Oral LD50 (rat): 680 mg/kg, Inhalation LC50 (rat, 4h): 3600 ppm, Dermal LD50 (rabbit): no reliable data
Chronic Effects: Liver and kidney toxicity, possible nervous system effects with repeated exposure
Carcinogenicity: Not classified by IARC as carcinogenic, but similar halogenated organics linked to cancer in animals
Reproductive/Developmental Toxicity: No clear evidence in humans, suspected based on structural similarity to known reproductive toxicants
Symptoms of Overexposure: Headache, dizziness, nausea, drowsiness, breathing difficulties, cumulative toxicity with repeated low-level exposure
Aquatic Toxicity: Harmful to aquatic life, EC50 (Daphnia magna): 48 mg/L (48h)
Persistence and Degradability: Not readily biodegradable, persists in environment
Bioaccumulation: Low to moderate potential, log Pow suggests some accumulation in aquatic organisms
Mobility in Soil: Moderately mobile, may leach to groundwater if released
Other Hazards: Ozone depleting properties documented for many brominated organics, so avoid environmental release
Disposal Notes: Must prevent release to water courses and soil to avoid long-term effects
Recommended Disposal: Collect liquids and solids in secure chemical waste containers, never pour down the drain
Incineration: Use a licensed chemical incinerator equipped for halogenated wastes, with scrubber for acid gases
Container Disposal: Triple rinse, puncture, and dispose of through hazardous waste stream
Precautions: Must follow federal, state, and local waste disposal regulations at every step, documentation should note date and quantity
Additional Instructions: Do not reuse empty containers for other chemicals or materials
UN Number: 2663
Proper Shipping Name: Dibromomethane
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: III
Marine Pollutant: Yes
Special Precautions: Secure in upright containers, segregate from foodstuffs, label correctly, carry emergency spill kit if transporting large quantities, keep away from ignition sources during transit
Inventory Status: Listed on TSCA (USA), EINECS (EU), DSL (Canada)
Regulations: Subject to strict workplace exposure monitoring requirements; SARA Title III Section 313 reportable chemical in the US
Label Requirements: Must bear signal word ‘Danger,’ appropriate hazard pictograms, and hazard statements
Restrictions: Occupational use only, not for pharmaceutical, food, or personal care production
Environmental Regulations: Releases amounting to a reportable quantity can require notification of local authorities; all packaging, transport, and disposal activities must comply with hazardous substance regulations on regional and national levels
