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Product Name: Bromoxynil
Chemical Name: 3,5-dibromo-4-hydroxybenzonitrile
Synonyms: Buctril, Brominal, Brominal EC
Recommended Use: Selective herbicide for the control of broadleaf weeds
Manufacturer: Bayer CropScience AG
Emergency Contact Number: CHEMTREC: 1-800-424-9300
CAS Number: 1689-84-5
Formula: C7H3Br2NO
Relevant Identified Uses: Agricultural and horticultural weed control
Restrictions on Use: Not for non-agricultural settings; not for use by untrained handlers
Classification: Acute Toxicity (Oral) Category 3; Skin Irritation Category 2; Eye Irritation Category 2A; Specific Target Organ Toxicity (Single Exposure) Category 3
Signal Word: Danger
Hazard Statements: Toxic if swallowed; causes skin irritation; causes serious eye irritation; may cause respiratory irritation
Pictogram: Skull and crossbones, exclamation mark
Precautionary Statements: Avoid contact with skin, eyes, clothing; use in a well-ventilated area; wash hands thoroughly after handling; do not eat, drink, or smoke while using this product
Other Hazards: May harm aquatic environments; hazardous to bees and beneficial insects; risk of bioaccumulation in soil
Active Ingredient: Bromoxynil (3,5-dibromo-4-hydroxybenzonitrile) 98%
Impurities: <0.5% (not considered hazardous at provided concentration)
Inert Ingredients: Non-hazardous adjuvants, surfactants 1–2%
Molecular Weight: 276.92 g/mol
Component Information: No components are present above the reporting threshold for carcinogens
General Advice: Avoid further exposure; take containers, label, and MSDS to medical professional
Inhalation: Move to fresh air immediately; keep at rest; seek medical attention if breathing becomes difficult or symptoms persist
Skin Contact: Remove contaminated clothing and shoes; wash skin gently and thoroughly with soap and water for at least 15 minutes; seek medical advice if irritation develops
Eye Contact: Rinse eyes thoroughly for at least 15 minutes holding eyelids open; remove contact lenses if present and easy to do; get medical help
Ingestion: Rinse mouth; do not induce vomiting; seek immediate medical attention; never give anything by mouth to an unconscious person
Symptoms: Nausea, vomiting, abdominal pain, headache, dizziness, skin redness, eye pain, watering
Suitable Extinguishing Media: Dry chemical, foam, CO₂, water spray
Unsuitable Extinguishing Media: Water jet (risk of chemical runoff)
Specific Hazards: Decomposition releases toxic gases (hydrogen bromide, cyanides, oxides of nitrogen)
Protective Equipment: Firefighters wear self-contained breathing apparatus and protective clothing
Special Procedures: Evacuate area; prevent runoff into drains and water bodies;
Combustion Hazards: Releases highly toxic fumes upon burning
Personal Precautions: Wear chemical-resistant gloves, goggles, and mask; avoid dust or vapor formation; ventilate area
Emergency Procedures: Evacuate unnecessary personnel; mark affected area
Environmental Precautions: Prevent entry to waterways, sewers, basements, or confined areas
Methods for Clean-Up: Contain and collect with non-combustible absorbent materials (sand, earth); sweep up and place in approved containers; wash spill area with water and detergent; avoid generating dust
Waste Disposal: Dispose of according to local environmental regulations
Handling: Handle in well-ventilated areas; avoid breathing vapors; protect skin, eyes, and clothing from product; keep away from food, drinks, and animal feed; do not eat, drink, or smoke during use
Storage: Store tightly closed in original packaging; keep in cool, dry, well-ventilated area away from direct sunlight and incompatible materials (strong oxidizers, acids, bases); keep out of reach of children and unauthorized personnel
Special Considerations: Store at temperatures below 40°C; avoid freezing; keep separate from food and water sources
Engineering Controls: Use local exhaust ventilation or other engineering controls to keep airborne levels below recommended exposure limits
Exposure Limits: ACGIH TLV: No established limit specifically for bromoxynil; keep exposure as low as possible
Personal Protective Equipment (PPE): Chemical-resistant gloves, eyewear (goggles or face shield), protective clothing (long sleeves, closed shoes), NIOSH-approved respirator if ventilation is inadequate
Hygiene Measures: Wash hands and exposed skin before eating, drinking, smoking, using the toilet; launder work clothing frequently
Environmental Controls: Prevent contamination of soil, waterways, and drains
Appearance: White to off-white crystalline solid or powder
Odor: Faint, characteristic
Odor Threshold: Not established
pH: 5.0–7.0 (1% aqueous suspension)
Melting Point: 188–189°C
Boiling Point: Decomposes before boiling
Flash Point: >110°C (closed cup)
Evaporation Rate: Negligible
Flammability: Not highly flammable
Vapor Pressure: 0.0015 mPa (at 25°C)
Solubility: Low in water (12 mg/L at 20°C), soluble in acetone, ethanol
Partition Coefficient (Log Kow): 2.7
Auto-ignition Temperature: No data
Decomposition Temperature: >200°C
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage and handling conditions
Reactive Incompatibility: Strong acids, oxidizing agents, alkalies
Hazardous Reactions: Reacts violently with strong oxidizers
Decomposition Products: Hydrogen bromide, hydrogen cyanide, oxides of carbon and nitrogen
Conditions to Avoid: Excess heat, flame, direct sunlight, moisture, acids, and bases
Routes of Exposure: Inhalation, skin contact, eye contact, and ingestion
Acute Toxicity: Oral LD50 (rat): about 190 mg/kg; Dermal LD50 (rabbit): about 400 mg/kg; Inhalation LC50 (rat, 4 h): about 0.5 mg/L
Skin Irritation: Causes moderate irritation
Eye Irritation: Causes severe irritation
Sensitization: May cause skin sensitization
Chronic Effects: Animal studies found liver and thyroid changes at repeated exposures
Carcinogenicity: Not listed as a human carcinogen by IARC, NTP, or OSHA
Reproductive and Developmental Toxicity: Some animal data suggest potential developmental effects at high doses
Symptoms: Headache, dizziness, nausea, abdominal pain, dermatitis, respiratory discomfort
Ecotoxicity (Aquatic): Highly toxic to fish and aquatic invertebrates, LC50 (rainbow trout, 96h): 0.04 mg/L
Ecotoxicity (Bee): Toxic to bees, LD50 (oral, 48h): about 0.2 µg/bee
Persistence and Degradability: Moderately persistent in soil (half-life: 1–2 weeks under aerobic conditions)
Bioaccumulative Potential: Potential based on log Kow value
Mobility in Soil: Moderately mobile; potential for runoff into water after heavy rainfall
Other Adverse Effects: May damage non-target plants and terrestrial invertebrates
Product Disposal: Collect and dispose through licensed hazardous waste contractor; do not pour into drains, watercourses, or onto soil
Container Disposal: Triple rinse containers; puncture and dispose in compliance with local, state, and federal regulations
Waste Codes: EPA Waste Number: U240
Special Precautions: Avoid contamination of surface and groundwater; never reuse empty containers
Recommended Method: Burial in approved landfill or incineration at facilities equipped to handle organobromides
UN Number: UN 2763
UN Proper Shipping Name: Organochlorine Pesticide, Solid, Toxic (Bromoxynil)
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: III
Marine Pollutant: Yes
Labels Required: Toxic, Marine Pollutant
Special Precautions for User: Keep separated from food and animal feed; ensure containers are upright and securely fastened; handle by trained staff
Road and Rail Transport: Comply with ADR/RID guidelines
Air Transport (IATA): Forbidden unless specifically excepted
Sea Transport (IMDG): Regulated as a marine pollutant
EPA Registration: Registered as a restricted use pesticide in the United States
OSHA Status: Regulated hazardous chemical under OSHA Hazard Communication Standard
SARA Title III: Section 313 reportable product
TSCA Status: Appears on the TSCA Inventory
EU Classification: Hazardous substance under Regulation (EC) No 1272/2008
WHMIS Classification: Class D, Division 1B (toxic); Division 2B (other toxic effects)
Other State Regulations: Subject to reporting under California Proposition 65 due to developmental toxicity in laboratory animal studies
