© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Chemical Name: Allyl Bromide
Synonyms: 3-Bromopropene
Chemical Formula: C3H5Br
CAS Number: 106-95-6
Appearance: Colorless to pale yellow liquid with a strong, unpleasant odor
Molecular Weight: 120.98 g/mol
Allyl bromide shows up in many organic labs because it brings valuable reactivity, especially during alkylation steps in synthesis work. Since this chemical features both a reactive double bond and a leaving group, its behavior raises real safety concerns. Researchers learn to recognize allyl bromide not only by smell but by the stories that attach to it. These identifiers matter since mistakes in label reading or improper storage cost both health and project resources. Sometimes people working with the compound forget to check its identity against both a CAS number and a common name, which can lead to accidental cross-use with other similarly named chemicals.
GHS Classification: Acute toxicity (oral, dermal, inhalation), skin irritation, eye irritation, respiratory sensitization
Hazard Statements: Highly flammable liquid and vapor; toxic if inhaled; causes severe skin and eye burns; suspected of causing cancer; may cause genetic defects; toxic to aquatic life
Signal Word: Danger
Anyone familiar with allyl bromide likely remembers stories of its volatility and toxicity. Accidental inhalation leads to immediate coughing, throat tightness, and headache, sometimes escalating to more severe distress. Direct skin or eye contact burns immediately and may leave lasting scars. This substance does not give users second chances for careless mistakes; its ability to poison and irritate prompts strict adherence to lab rules. For workers, understanding these hazard classes means more than just box-checking. Each label on a bottle serves as a warning earned through real cases of exposure and environmental spillage.
Main Ingredient: Allyl Bromide (C3H5Br) nearly 100% purity in most commercial and lab grades
Here, purity matters. Downplaying trace admixtures does not help in safety assessment because even a slight impurity may introduce unexpected reactions, making situations even riskier. In practice, most exposure comes from contact with nearly pure allyl bromide; this single component drives the core toxic risk.
Inhalation: Move the exposed person to fresh air immediately; provide oxygen or artificial respiration if breathing is difficult; seek medical attention promptly
Skin Contact: Remove contaminated clothing right away and rinse the skin with plenty of running water for at least 15 minutes; seek medical help
Eye Contact: Rinse eyes with water for at least 15 minutes, lifting eyelids repeatedly; get medical attention as soon as possible
Ingestion: Do not induce vomiting; rinse mouth and seek immediate medical assistance
These steps are not learned by heart but through stories from mentors and warnings in safety drills. A split-second of fumbling a bottle or mishandling a pipette often forces these first aid steps from textbook to real life, and nobody forgets the sting or burning of accidental contact. Emergency stations, eyeshowers, and showers must be easily accessible in any room where this chemical is handled. Quick reaction and knowledge make the difference between harm and recovery.
Suitable Extinguishing Media: Carbon dioxide, dry powder, alcohol-resistant foam
Specific Hazards: Releases toxic and corrosive gases including hydrogen bromide and carbon oxides if combustion occurs
Firefighter Protection: Use self-contained breathing apparatus and full personal protective gear
Anyone who has seen a flammable chemical catch fire knows the panic that fast, hot blazes create—especially toxic ones. Smoke from burning allyl bromide causes blinding and choking, requiring both fast response and proper gear. Water may not be suitable, as the reaction with hot liquid surfaces might intensify the hazard. Keeping dedicated extinguishers nearby is not just a good idea but a critical rule; failing to do so endangers both people and structures.
Personal Precautions: Evacuate unprotected personnel; avoid breathing vapors or mist; wear appropriate protective equipment
Environmental Precautions: Prevent entry into soil, watercourses, or drains
Cleanup Methods: Absorb spills with inert material like sand or vermiculite; transfer to a chemical waste container; ventilate the area thoroughly
Spills can turn an ordinary workday into a crisis. Many lab workers remember the chaos as an unmistakable odor signals trouble before visual confirmation. Teams must step away promptly, don PPE, and coordinate removal using absorbents that keep the volatile liquid in check. Doors stay shut to prevent vapor spread, but the goal remains quick, thorough clean-up to minimize long-term harm. Sometimes, overlooked droplets under equipment continue to vaporize, so routines demand vigilance long after the main spill has gone.
Handling: Work inside a fume hood; use secondary containment; avoid contact with skin, eyes, and clothing; keep away from sparks, static, open flames
Storage: Store in tight, sealed containers in a cool, well-ventilated area; isolate from incompatible substances like strong oxidizers, acids, or bases; keep away from heat sources and direct sunlight
True commitment to safety reveals itself in routines: double-checks on seal integrity, deliberate movement from storage to work area, and constant verification of fume hood function. Laxity creeps in as projects pile up, but seasoned researchers know allyl bromide punishes carelessness harshly. Storing this substance with other volatiles exacerbates danger, so workers rely on clear labeling and storage segregation. Memory helps, but institutional rules written after painful missteps matter more in keeping everyone safe.
Engineering Controls: Use of chemical fume hoods; maintain local ventilation at source
Personal Protective Equipment: Chemical-resistant gloves (nitrile or neoprene), goggles or full-face shields, lab coats, long pants, closed-toe shoes, respiratory protection if ventilation is insufficient
Exposure Limits: Occupational exposure standards remain set or recommended by bodies such as ACGIH or OSHA; in absence, keep exposures as low as possible
Early-career lab members sometimes underestimate the reliability of PPE. Friends painfully recall rashes from glove tears and eye stinging through ordinary glasses. Selecting gear, testing for fit, and double-layering gloves for high-risk operations becomes routine with experience—or after an accident. Those with responsibility for others embrace redundancy in safety checks as an everyday requirement, not a suggestion.
State: Liquid at room temperature
Color: Colorless to yellowish
Odor: Strong, irritating, acrid
Boiling Point: 71–72°C
Melting Point: –119°C
Flash Point: −3°C (closed cup)
Solubility: Insoluble in water; miscible with most organic solvents
Vapor Pressure: Approximately 50 mmHg (20°C)
Those who have handled it do not forget the pungent smell, nor the slick, volatile feel when poured. Fume hoods matter because the material easily evaporates at normal temperatures, and that same volatility contributes to both handling danger and process usefulness. Faint yellowing hints at decomposition, urging disposal or purification before disastrous lab mishaps occur. Knowing these physical markers in detail helps researchers avoid imaginative yet risky shortcuts that might tempt less experienced colleagues.
Chemical Stability: Stable under recommended storage conditions
Reactivity: Reacts violently with strong bases and oxidizers, producing heat and toxic gases
Hazardous Decomposition Products: Hydrogen bromide, carbon monoxide, carbon dioxide
Even careful workers sometimes fall into routine, forgetting that allyl bromide, although stable enough in glass bottles, behaves unpredictably outside narrow guidelines. Unexpected exposures to strong bases in shared work environments can lead to rapid, uncontrolled reactions. Experienced staff share stories about glassware failures or heating errors that release dense, corrosive fumes, forcing evacuation and raising questions about risk assessment during every new batch or procedure.
Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Acute Effects: Severe burns to skin, eyes, respiratory tract; nausea, dizziness, headache, coughing, chest pain shortly after inhalation
Chronic Effects: Potential carcinogen and mutagen; chronic exposure linked to nervous system damage, liver and kidney issues
Toxicity comes as a surprise to many new lab users, but those who read deeper realize that animal studies show long-term genetic impacts and carcinogenic potential. Those responsible for group safety develop a watchful attitude toward spills and vapors, knowing that even minimal exposure risks matter over a working lifetime. The risk looms larger for newcomers, who must develop both caution and skepticism regarding anything that promises easy results in synthesis work.
Environmental Hazards: Toxic to aquatic life
Persistence and Degradation: Expected to degrade slowly in the environment
Bioaccumulation: Potential for bioaccumulation in aquatic organisms
Environmental impact does not end inside the lab walls. Waste streams containing allyl bromide pose a hazard to aquatic organisms and disrupt normal microbial life. Disposal practices that ignore the toxicity lead to bigger community and environmental issues. Seasoned workers consistently separate halogenated from non-halogenated chemicals to avoid cross-contamination at disposal sites, not from rigid habit but from concern for real-world outcomes. Overlooked leaks, even in small volumes, drastically impact nearby water sources and wildlife.
Waste Treatment: Incineration at licensed chemical waste facilities
Container Disposal: Triple rinse and puncture containers before discarding per hazardous waste protocols
Precautions: Do not pour down the drain; avoid release to environment
Improper disposal creates problems for waste handlers, downstream ecosystems, and regulatory compliance efforts. Waste segregation, thorough documentation, and use of approved waste contractors form the backbone of responsible chemical management. Those who cut corners here usually make trouble for everyone else. The task appears mundane until improperly managed allyl bromide leads to measurable local pollution or costly regulatory interventions.
UN Number: UN2334
Transport Hazard Class: 6.1 (Toxic substances), 3 (Flammable liquids)
Packing Group: I (high danger)
Shipping allyl bromide, even between research labs, requires deep knowledge of regulations and practical risk management. Only those equipped and authorized handle shipments, using certified packaging and up-to-date hazard labeling. Transport mistakes leach risk into the public sphere, as accidental spillage affects everyone using roads and public infrastructure. Regulatory oversight for this category of chemicals reflects past transport incidents costing both money and lives, so following every rule protects both handlers and the public.
Regulatory Status: Classified as a hazardous substance under international, national, and regional regulations
Restrictions: Subject to strict workplace exposure limits in jurisdictions with clear occupational safety frameworks
Laws and workplace rules develop in response to well-known mishaps, documented poisonings, and environmental releases. Laboratories and firms handling allyl bromide face inspections and reporting obligations, not to generate paperwork but to ensure public safety. Each rule reflects a record of real accidents or longer-term risk findings. Awareness and compliance require continuous learning, especially as new research emerges on long-term health and ecological impact.
