Chemical Name: 1-Bromo-3-Chloro-5,5-Dimethylhydantoin
Common Names: BCDMH, Halobrom, Bromochlorodimethylhydantoin
CAS Number: 32718-18-6
Recommended Use: Disinfection in water treatment, swimming pool sanitizers, industrial biocides
Supplier Identification: Manufacturer address, emergency phone numbers, technical contact details supplied with shipment
Emergency Overview: Solid, white crystalline material, faint halogen odor, used mainly for its biocidal properties.
Classification: Oxidizing solid, Acute toxicity (oral), Irritant (skin/eye/respiratory), Environmental hazard to aquatic life
Label Elements: Corrosive, Oxidizer, Harmful if swallowed, Irritating to eyes, skin, and respiratory tract
Signal Word: Danger
Hazard Statements: Causes serious eye damage, may cause respiratory irritation, harmful to aquatic organisms with long lasting effects
Precautionary Statements: Avoid contact with skin and eyes, avoid inhalation of dust, do not ingest, use in well-ventilated areas
Route of Entry: Inhalation, ingestion, skin and eye contact
Symptoms: Burning sensation, watering eyes, sore throat, skin redness, gastrointestinal upset with ingestion
NFPA Ratings: Health: 2, Flammability: 0, Reactivity: 1, Special: OX (oxidizer)
Chemical Composition: 1-Bromo-3-Chloro-5,5-Dimethylhydantoin
CAS Number: 32718-18-6
Concentration: Greater than 98% active ingredient
Impurities: Minor hydrocarbons, trace organic byproducts
Additives: May include trace inert stabilizers as allowed by manufacturer
Appearance: White crystalline granules or powder
Odor: Slight odor of halogen (chlorine/bromine)
Eye Contact: Rinse cautiously with water for at least 15 minutes, keep eyelids open, seek immediate medical attention
Skin Contact: Wash thoroughly with plenty of water and soap, remove contaminated clothing, seek medical attention if irritation persists
Inhalation: Move person to fresh air, keep at rest, seek medical care for breathing difficulties
Ingestion: Do not induce vomiting, rinse mouth, seek immediate medical help, never give anything by mouth to an unconscious person
Symptoms and Effects: Eye burns, throat irritation, coughing, stomach upset, drowsiness or confusion on severe exposure
Advice for Medical Personnel: Treat symptomatically, monitor respiration, administer oxygen if breathing becomes difficult
Suitable Extinguishing Media: Water spray, dry chemical, CO2, foam
Unsuitable Media: Avoid direct high-pressure water jets, don’t use halogenated extinguishers
Hazards from Combustion: Produces corrosive and toxic fumes including hydrogen bromide, hydrogen chloride, nitrogen oxides, carbon monoxide
Protective Equipment: Full-body chemical resistant PPE, positive-pressure SCBA for firefighters
Special Precautions: Remove containers from fire area if safe, avoid inhalation of gases, cool exposed containers with water spray
Explosion Sensitivity: Not explosive under normal conditions but oxidizing action increases fire intensity if involved
Personal Precautions: Suitable PPE including gloves, goggles, respiratory protection, avoid dust formation
Environmental Precautions: Prevent material from entering drains, surface or ground water
Methods for Cleanup: Sweep up spills into labeled containers, avoid generating dust, ventilate area, wash spill site thoroughly after removal
Containment: Isolate spill area, use non-sparking tools, ensure adequate ventilation
Disposal: Follow local, regional, and national regulations for disposal of oxidizing and halogenated substances
Handling Practices: Minimize dust, avoid direct contact, use with adequate ventilation, do not mix with other chemicals, keep away from heat and open flames
Storage Conditions: Store in a cool, dry, well-ventilated place, keep container tightly closed, keep away from incompatible materials such as acids, reducing agents, ammonia compounds
Packaging: Use corrosion-resistant containers, store away from combustible materials
Special Precautions: Avoid release into the environment, keep product away from children and unauthorized personnel
Incompatibles: Do not store near organic materials, bases, metallic powders, easily oxidizable materials
Exposure Limits: No official occupational exposure limits set by OSHA or ACGIH; minimize exposure by engineering controls
Engineering Controls: Local exhaust ventilation, process enclosure, emergency showers and eyewash stations recommended
Personal Protective Equipment: Chemical-resistant gloves (nitrile, neoprene), safety goggles or face shield, lab coat or coveralls, dust mask or respirator for dusty operations
Hygiene Measures: Wash hands thoroughly after handling, do not eat or drink in work area, remove contaminated clothing before leaving the workplace
Environmental Controls: Avoid discharge into drains, use containment measures in storage and transfer areas
Personal Monitoring: Supervisors should enforce safe handling by regular workplace safety checks
Appearance: White, crystalline solid
Odor: Mild halogen-like smell
Odor Threshold: Not available
pH: 5.0-6.0 at 1% aqueous solution
Melting Point/Freezing Point: Decomposes over 160°C, does not melt cleanly
Boiling Point: Not applicable (decomposes before boiling)
Flash Point: Not flammable
Evaporation Rate: Non-volatile
Flammability: Not flammable; powerful oxidizer
Vapor Pressure: Negligible at room temperature
Vapor Density: Not applicable
Solubility: Slightly soluble in water, more soluble in organic solvents
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: Not self-igniting
Decomposition Products: Hydrogen bromide, hydrogen chloride, nitrogen oxides on heating or burning
Chemical Stability: Stable under normal conditions, decomposes with heat or exposure to moisture
Reactivity: Vigorous reaction with acids, bases, reducing agents, organic compounds, especially in moist air
Conditions to Avoid: Avoid heat, moisture, direct sunlight, all sources of ignition, and contamination with incompatible substances
Incompatible Materials: Strong acids, ammonia, reducing agents, combustibles
Hazardous Decomposition: Corrosive and toxic gases including hydrogen bromide, chlorine, nitrogen oxides
Polymerization: Does not polymerize
Acute Toxicity: Harmful by ingestion, inhalation, and contact; LD50 (oral, rat): ~930 mg/kg
Skin Corrosion/Irritation: Causes skin irritation, redness, pain
Eye Damage/Irritation: Causes severe eye damage, risk of permanent injury without prompt rinsing
Respiratory Sensitization: May cause coughing, sore throat, shortness of breath with inhalation
Chronic Effects: Prolonged exposure may lead to dermatitis or respiratory sensitization
Mutagenicity, Carcinogenicity, Reproductive Toxicity: Not classified as carcinogen or mutagen based on current studies
Potential Routes of Exposure: Skin, eyes, inhalation of dust, ingestion during improper handling
Aquatic Toxicity: Highly toxic to aquatic life, both acute and chronic effects on fish and invertebrates
Persistence and Degradability: Not readily biodegradable, breaks down to bromide, chloride ions, and other byproducts
Bioaccumulative Potential: Low due to rapid hydrolysis, but toxic to environment before degradation
Mobility in Soil: Limited, hydrolyzes and binds to soil particulates
Other Adverse Effects: Alters water chemistry, disrupts biological wastewater treatment if released
Precautions: Prevent direct release to surface waters; follow best practices for environmental protection during use and disposal
Waste Treatment Methods: Neutralize and dilute with water, consult with licensed chemical waste disposal company
UN Number for Waste: 3085 (oxidizing solid, n.o.s.)
Disposal Recommendations: Incineration or landfill at authorized sites under local regulations, do not discharge concentrated solutions to sewers
Contaminated Packaging: Clean and dispose as hazardous waste according to local, state, and federal requirements
Precautions for Disposal: Avoid contact of waste with organic or combustible materials during collection and disposal
UN Number: 3085
UN Proper Shipping Name: Oxidizing solid, n.o.s. (Contains BCDMH)
Transport Hazard Class: 5.1 (oxidizer)
Packing Group: II
Hazard Labels: Oxidizer, corrosive
Environmental Hazards: Dangerous for the environment, especially aquatic
Transport Precautions: Ship in original, properly sealed packaging, protect from mechanical shock, secure against movement, follow international guidelines such as IMDG, IATA, ADR
OSHA Status: Regulated as hazardous chemical under Hazard Communication Standard
TSCA Status: Listed
SARA Title III: Section 313 reportable chemical
EPA Registration: Registered for some water treatment uses
Labeling Requirements: Includes hazard symbols, precautionary and response statements, supplier information
Right-to-Know Laws: Subject to reporting in multiple U.S. states
REACH Registration (EU): Notified substance, safety data sheets compliant with EU requirements
Other International Regulations: Covered under international marine, air, and ground transport rules as listed above
