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Product Name: Mixture of Nitrogen Monoxide and Dinitrogen Tetroxide
Chemical Family: Inorganic gases
Synonyms: NO/N2O4 mixture, Nitric Oxide – Dinitrogen Tetroxide blend
Product Use: Rocket propellant, chemical synthesis, laboratory reagent
Supplier Information: Industrial gas supplier details available on request
Emergency Phone: Refer to local poison control or emergency response
Manufacturer Contact: Provided upon purchase order or specific inquiry
GHS Classification: Oxidizing gas, Toxic gas, Gas under pressure
Hazard Statements: Causes severe respiratory irritation, fatal if inhaled, supports combustion, may cause methemoglobinemia, toxic to aquatic life
Pictograms: Skull and crossbones, gas cylinder, flame over circle
Signal Word: Danger
Precautionary Statements: Avoid breathing gas, keep away from heat/sparks/flames, use explosion-proof equipment, avoid release to environment
Effects of Exposure: Coughing, difficulty breathing, chest pain, headache, dizziness, skin and eye irritation, lung damage
Nitrogen Monoxide (NO): 30-70%, CAS Number: 10102-43-9
Dinitrogen Tetroxide (N2O4): 30-70%, CAS Number: 10544-72-6
Impurities: Trace nitrogen dioxide, water vapor depending on storage conditions
Exposure Limits: OSHA, NIOSH, ACGIH have set strict limits for both gases
Other Components: Purposeful absence of stabilizers or additives
Inhalation: Move person to fresh air without delay, call emergency services, administer oxygen if breathing is difficult, perform artificial respiration if not breathing
Skin Contact: Remove contaminated clothing, flush skin with copious running water for at least 15 minutes, seek immediate medical attention
Eye Contact: Rinse eyes gently with water for several minutes, hold eyelids apart, remove contact lenses if easy to do, continue rinsing and call a doctor
Ingestion: Gas is unlikely to be ingested but risk arises from mouth-to-mouth in contaminated atmosphere, seek prompt medical help
Symptoms of Overexposure: Blue-tinted skin (cyanosis), rapid breathing, delayed fluid buildup in lungs (pulmonary edema)
Medical Note: Immediate treatment is critical; blood oxygenation monitoring required
Suitable Extinguishing Media: Water spray, dry chemical, carbon dioxide for adjacent fire – product itself does not burn but supports combustion
Specific Hazards: Releases toxic fumes of nitrogen oxides when heated, reacts vigorously with combustibles
Protective Equipment: Full-face self-contained breathing apparatus and chemical protective clothing
Fire-Fighting Instructions: Isolate area, avoid inhaling fumes, cool containers with water spray, remain upwind, evacuate personnel
Explosion Sensitivity: Gas under pressure, risk of cylinder rupture if heated
Special Precautions: Avoid extinguishing leaks unless safe to do so; let venting gas burn under controlled conditions
Personal Precautions: Evacuate unprotected personnel, ventilate area, use respirators and chemical-resistant clothing
Environmental Precautions: Prevent releases to sewers or watercourses, notify authorities if large volume escapes
Spill Response: Stop source if safe, use gas detectors, dilute with air or neutralize with alkaline scrubbers, ventilate
Decontamination: Clean surrounding surfaces with copious water and detergent where safe
Special Hazards: Contact with combustibles increases risk, ensure electrical sources are controlled
Disposal of Residues: Absorb small leaks into incombustible material if possible before disposal
Handling: Use only in well-ventilated areas or fume hoods, never breathe vapors, utilize equipment rated for oxidizer gases, prevent contact with organic matter
Storage Conditions: Store in tightly closed, approved gas cylinders, in cool, dry well-ventilated locations away from sunlight, incompatible substances, and ignition sources
Segregation: Keep away from fuels, reducing agents, combustibles, acids, bases
Storage Temperatures: Do not expose containers to temperatures exceeding 50°C, prevent freezing of valves
Empty Cylinder Handling: Mark as empty, secure, ventilate before disposal
Exposure Limits: Nitrogen Monoxide OSHA PEL: 25 ppm TWA, Dinitrogen Tetroxide OSHA PEL: 1 ppm
Engineering Controls: Use explosion-proof ventilation and continuous monitoring, local exhaust at point of release
Personal Protective Equipment: NIOSH-approved full-face respirator with supplied air or self-contained breathing apparatus, chemical-resistant suit, rubber gloves, goggles
Workplace Practices: Regular leak checks, training on hazards, emergency shower/eyewash stations
Hygiene Measures: Prohibit eating, drinking, or smoking in areas of use, wash hands after handling
Monitoring: Conduct frequent air monitoring for nitric oxides
Appearance: Colorless to reddish-brown gas mixture depending on proportions
Odor: Sharp, pungent, irritating
pH: Acidic if dissolved in water
Boiling Point: NO: -151.8°C, N2O4: 21.2°C
Melting Point: NO: -163.6°C, N2O4: -9.3°C
Vapor Pressure: Variable depending on mix, both gases at high vapor pressure at room temperature
Solubility: Soluble in water; forms nitric and nitrous acids
Specific Gravity: Heavier than air
Stability: Reacts with water, air and combustibles
Decomposition Products: Nitrogen dioxide, nitric oxide
Chemical Stability: Stable under specified storage and handling, decomposes in heat and on exposure to air or moisture
Conditions to Avoid: Heat, open flames, direct sunlight, contact with water
Incompatible Materials: Organic substances, reducing agents, alkalis, metals
Hazardous Reactions: Violent oxidizing reactions, explosive with some compounds
Hazardous Decomposition: Nitrogen oxides, ozone generation possible
Polymerization: Will not polymerize under normal use
Acute Toxicity: NO and N2O4 are both highly toxic by inhalation, cause methemoglobinemia and delayed pulmonary edema
Chronic Exposure: Prolonged inhalation may cause permanent lung injury, risk of respiratory illnesses
Carcinogenicity: Not classified as carcinogen by IARC, NTP, OSHA but ongoing study of related compounds
Reproductive Effects: High exposures may negatively impact fetal development
Other Effects: Headache, confusion, chest tightness, risk of death from respiratory failure
Routes of Exposure: Inhalation primary, rare dermal absorption risk
Target Organs: Lungs, blood (methemoglobin formation)
Environmental Fate: Rapidly hydrolyzes in moist air to nitric/nitrous acids, contributes to acid rain
Aquatic Toxicity: Harmful to aquatic organisms, causes local pH drop, oxygen depletion
Persistence: Reactive, not bioaccumulative, persists as secondary acid pollutants
Release Considerations: Small leaks disperse rapidly but large releases can devastate nearby water/soil
Biodegradability: Non-biodegradable, broken down chemically in atmosphere
Mobility: High as gases, moves quickly in air, deposits locally with rainfall as acids
Waste Handling: Neutralize gases in alkaline scrubbers before release, recover unused product where possible
Contaminated Containers: Purge with inert gas, label and return to supplier or dispose via licensed hazardous waste contractor
Environmental Disposal Guidance: Prohibit discharge to watercourses, open land; incineration or chemical conversion recommended
Regulatory Status: Listed hazardous waste under US EPA, strict European and Asian controls
Waste Code: Dependent on proportions and local regulations
UN Number: 1660
Proper Shipping Name: Nitrogen oxides, compressed
Hazard Class: 2.3 (Toxic Gas), 5.1 (Oxidizer, if applicable)
Packing Group: Not applicable to gases, follow cylinder code
Labels: Toxic gas, oxidizer (if present above threshold)
Transport Precautions: Use approved gas cylinders, leak-proof packaging, vehicle placarding
Regulations: Complies with ADR, IMDG, IATA, DOT for gas transport
US Regulations: OSHA regulated, CERCLA reportable quantity for NO and N2O4, SARA Title III Section 313 listing
TSCA Status: All components listed
EU Regulations: REACH registration required, CLP Labeling as oxidizer and acute toxicant
National Inventories: Australia AICS, Canada DSL, China IECSC, Japan ENCS, Korea ECL – all listed
Labeling Requirements: Strict hazard communication, emergency procedures posted, employee right-to-know enforced
Workplace Regulations: Mandatory written hazard assessment, training, medical surveillance for users
