Chemical Name: Hydrazine Hydrate
Common Names: Hydrazine monohydrate, Diamide hydrate
Appearance: Clear, colorless, fuming liquid often carrying an ammonia-like sharp, musky odor
Recommended Use: Used in water treatment, pharmaceuticals, rocket propellants, polymerization processes, chemical synthesis
Known Synonyms: N2H4·H2O
Odor Threshold: Often detectable at low concentrations, around 1 ppm, depending on individual sensitivity
Hazard Classes: Acute toxicity (oral, dermal, inhalation), carcinogenicity, skin corrosion, serious eye damage, aquatic toxicity
Signal Words: Danger
Pictograms: Skull and crossbones, corrosion, exclamation mark, environment
Major Risks: Severe irritation or burns to eyes, skin, and respiratory tract, risk of cancer, possible organ damage on prolonged exposure, dangerous vapors at room temperature
Potential Routes of Exposure: Inhalation of vapor, skin absorption, accidental ingestion, eye splashes
Active Substance: Hydrazine hydrate (typically between 40-80% hydrazine by weight in water solution)
Impurities: Minimal, but small amounts of ammonia or volatile organic residues may be present depending on synthesis
Chemical Formula: N2H4·H2O
Molecular Weight: 50.06 g/mol
Inhalation: Move affected person into fresh air, loosen any tight clothing, seek medical attention for cough, breathing difficulty, or persistent irritation
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with running water (and mild soap if available), medical help is necessary for burns or continued irritation
Eye Contact: Flush eyes with large amounts of lukewarm water for at least 15 minutes, keeping eyelids apart, contact an ophthalmologist promptly
Ingestion: Rinse mouth, do not induce vomiting, give water if conscious, lay person on side to reduce aspiration risk, transport to emergency care as quickly as possible
Symptoms to Watch: Difficulty breathing, bluish lips, confusion, fits, severe redness or blistering of the skin or eyes
Suitable Extinguishing Media: Water spray, alcohol-resistant foam, dry chemical, carbon dioxide
Unsuitable Media: Water jets may spread spilled material
Specific Hazards: Releases toxic and flammable vapors, decomposes into nitrogen, ammonia, and hydrogen gases, strong risk of violent reaction on contact with oxidizers or certain metals
Special Protective Equipment: Full-body suit, positive-pressure self-contained breathing apparatus, heat-resistant gloves
Additional Advice: Approach from upwind, remove all ignition sources, douse contaminated clothes on fire with water
Explosion Risk: Vapors form explosive mixtures with air at certain concentrations, static electricity sparks can ignite the substance
Personal Precautions: Evacuate personnel, ventilate space, isolate area to prevent unauthorized access, avoid breathing vapors
Protective Gear: Chemical-resistant gloves, safety goggles or face shield, long-sleeved chemical-resistant clothing, respiratory equipment if vapor concentrations expected
Spill Response: Absorb spills on vermiculite, dry sand, or earth, carefully collect and transfer to labeled waste containers, wash down residue with plenty of water, prevent runoff into drains, surface water, or soil
Environmental Precautions: Block entry into sewers, notify relevant authorities if contamination may occur
Handling Practices: Work with the material only in fume hood or well-ventilated area, avoid direct contact with skin or eyes, never eat, drink, or smoke in work areas, keep containers tightly closed when not in use
Storage Conditions: Store in cool, dry, well-ventilated location away from acids, oxidizers, chlorine, copper, nickel, and silver, use containers with chemical-resistant liners
Incompatibilities: Avoid storing with peroxides, oxidizing agents, strong acids, many metals
Engineering Controls: Install vapor detection system and spark-proof ventilation in storage areas
Permissible Exposure Limit: OSHA and ACGIH recommend airborne exposure limits, typically below 0.1 ppm as an eight-hour Time-Weighted Average
Monitoring: Use continuous monitoring for airborne vapor, install alarms for leaks
Recommended PPE: Impervious gloves, chemical splash goggles, face shields, lab coat or apron, respirators fitted with organic vapor cartridges in high-risk settings
Hygiene: Immediate washing of any exposed skin, proper laundering of contaminated clothing, workplaces need safety showers and eye-wash stations within close reach
Boiling Point: Around 120°C for hydrate (higher for more concentrated solutions)
Melting Point: Approximately 2°C
Flash Point: Around 75°C (closed cup)
Solubility: Fully miscible with water, reacts with many organic solvents
Vapor Pressure: Moderate at room temperature, increases rapidly with heat
Density: Around 1.03 g/cm³ for standard solutions
pH: Strongly alkaline
Odor: Ammonia-like sharpness, easily detectable by most people
Evaporation Rate: High at open surface, vapor rises easily
Chemical Stability: Unstable at elevated temperatures, may decompose violently in contact with incompatible materials
Hazardous Reactions: Intense reactions with oxidizing agents, metals, or acidic substances; can produce toxic ammonia, nitrogen oxides, and hydrogen gases
Polymerization: May occur under specific thermal or catalytic conditions
Conditions to Avoid: Heat, flames, sparks, contamination by acids or oxidizers, confined or poorly ventilated spaces
Acute Effects: Toxic by ingestion, skin contact, and inhalation; symptoms include nausea, vomiting, headache, respiratory distress, and severe eye or skin burns
Chronic Effects: Prolonged exposure increases risks for liver and kidney damage, nervous system effects, cancer (IARC classifies hydrazine as possibly carcinogenic to humans)
Sensitization: Can trigger allergic reactions in sensitive individuals
Mutagenicity: Demonstrated in some laboratory tests; ongoing debate and research on long-term genetic risks
Target Organs: Liver, kidneys, central nervous system, lungs, skin, eyes
Routes of Entry: Inhalation, dermal, oral
Aquatic Impact: Highly toxic to fish, aquatic invertebrates, and algae, with lethal concentrations in small amounts
Degradation: Degrades slowly in the environment, breaking down by hydrolysis and microbial action
Persistence: May persist in water and soil for days to weeks, depending on temperature and microbial activity
Bioaccumulation: Not significantly expected, but disruption of aquatic life cycles makes accidental release extremely hazardous
Environmental Guidelines: Spills require rigorous cleanup, direct discharges can affect entire ecosystems quickly
Waste Treatment: Incinerate only in a licensed facility with scrubbers to neutralize exhaust, do not landfill
Small Quantities: Neutralize carefully with dilute hydrogen peroxide, sodium hypochlorite or potassium permanganate while controlling reaction temperature and venting
Avoid: Pouring into drains, natural bodies of water, or general landfill
Disposal Containers: Use corrosion-resistant, tightly sealed drums labeled with contents and hazards
Labeling: Corrosive, toxic, environmentally hazardous substance
Packaging: Use certified containers that resist corrosion and leakage
Cargo Requirements: Separate from food, animal feed, oxidizers, acids; temperature-controlled containers may be required for large shipments
Accident Mitigation: Emergency response kits on hand along shipping route; transport crews trained in spill containment
Reporting: Regulatory reporting in case of significant release during transit
Legislation: Listed as hazardous by most global regulatory bodies, including EU REACH, OSHA, and US EPA
Occupational Limits: Strictly enforced exposure limits in workplaces; compulsory training for those handling the substance
Label Requirements: Strict hazard labeling, including pictograms, toxicity, and safety warnings on all containers
Banned Uses: Restricted in consumer products in many countries; controlled for transport, storage, and disposal
Worker Protection: Employers required to provide personal protective gear, emergency wash stations, and regular health monitoring under federal workplace safety laws
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