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Chemical Name: Monomethylamine
Synonyms: Methylamine, Methanamine
CAS Number: 74-89-5
Molecular Formula: CH5N
Molecular Weight: 31.06 g/mol
Supplier Name: Leading chemical suppliers and manufacturing laboratories
Usage: Used in agricultural chemicals, drugs, dyes, rubber chemicals, and water treatment compounds
Phone Number for Emergency: Provided by your regional producer or Poison Control Center
Address: Specific to supplier or manufacturer
GHS Classification: Flammable Gas (Category 1), Acute Toxicity – Inhalation (Category 3), Skin Corrosion/Irritation (Category 1B), Serious Eye Damage/Irritation (Category 1)
Signal Word: Danger
Hazard Statements: Extremely flammable gas; Toxic if inhaled; Causes severe skin burns and eye damage; May cause respiratory irritation
Pictograms: Flame, Skull and Crossbones, Corrosion, Exclamation Mark
Routes of Exposure: Inhalation, skin contact, eye contact
Target Organs: Eyes, skin, respiratory system
Symptoms: Burning sensations, coughing, wheezing, headache, nausea, vision impairment, possible pulmonary edema
Chemical: Monomethylamine
Concentration: 99% or more (anhydrous form)
Impurities: Water, other methylamines in trace amounts depending on purity
CAS Number: 74-89-5
EC Number: 200-820-0
Index Number: 612-001-00-9
General Actions: Immediately remove victim from exposure area to fresh air
Inhalation: Move to fresh air, provide oxygen if breathing is difficult, seek medical attention quickly, administer artificial respiration if breathing stops
Skin Contact: Rinse skin with copious amounts of running water for at least 15 minutes, remove contaminated clothing, call a physician
Eye Contact: Wash eyes thoroughly for at least 15 minutes while holding eyelids open, seek immediate medical advice
Ingestion: Do not induce vomiting, never give anything by mouth to an unconscious person, seek medical help
Delayed Effects: Possible fluid accumulation in lungs, eye injury, severe burns
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, water spray (to cool containers)
Unsuitable Extinguishing Media: Full water jet may spread the fire
Specific Hazards: Forms explosive mixtures with air, vapors are heavier than air, may travel significant distances to ignition source, combustion releases toxic nitrogen oxides
Protective Equipment: Self-contained breathing apparatus, full protective suit
Advice for Firefighters: Evacuate area, stay upwind, avoid inhalation of combustion gases
Personal Precautions: Evacuate area, restrict access, ensure adequate ventilation, wear full protective equipment including chemical-resistant gloves, eye protection, and self-contained breathing apparatus
Environmental Precautions: Prevent flow into sewers, waterways, or soil
Clean-up Procedures: Stop leak if safe to do so, use non-sparking tools, absorb with inert dry material, ventilate area, dispose according to regulations
Special Attention: Evacuate downwind areas, remove ignition sources
Handling: Use only in well-ventilated locations, ground containers, avoid inhalation or contact with skin and eyes, utilize spark-proof tools and explosion-proof equipment, wash thoroughly after handling, keep cylinders upright and secure
Storage Conditions: Store in tightly sealed, corrosion-resistant containers in a cool, dry, well-ventilated area away from incompatible substances such as acids and oxidizers
Storage Temperature: Keep below 25°C (77°F) if possible
Incompatibilities: Acids, oxidizing agents, halogens
Other Notes: Label containers clearly, keep away from sources of heat and ignition
Exposure Limits: OSHA PEL: 10 ppm (18 mg/m³); ACGIH TLV: 5 ppm (8-hour TWA), 15 ppm (STEL)
Engineering Controls: Use with adequate ventilation, local exhaust recommended, gas detectors in place for leakage monitoring
Personal Protective Equipment: Chemical-resistant gloves (nitrile, neoprene), safety goggles or face shield, flame-resistant clothing, respiratory protection if exposure risk exceeds permissible limits
Hygiene Measures: Do not eat, drink, or smoke while handling; wash hands and exposed skin after handling
Physical State: Compressed gas (at room temperature), colorless
Odor: Fishy, ammonia-like
Odor Threshold: 1-10 ppm
Boiling Point: -6.3°C (20.7°F)
Melting Point: -93°C (-135°F)
Flash Point: Flammable gas
Explosion Limits: Lower: 4.9%, Upper: 20.7% (in air)
Vapor Pressure: 3.8 atm at 20°C
Solubility in Water: Very soluble
Specific Gravity (Gas): 0.7 (air=1)
pH: Alkaline in solution
Other Data: Easily forms explosive mixtures with air, strong base, readily absorbs moisture
Chemical Stability: Stable under recommended storage conditions
Polymerization: Not expected to occur
Conditions to Avoid: Direct sunlight, heat, incompatible substances, sources of ignition
Incompatible Materials: Strong acids, oxidizers, copper, zinc, aluminum, halogens
Hazardous Decomposition: Releases toxic nitrogen oxides and ammonia on combustion
Acute Toxicity: Inhalation LC50 (rat): 12,600 ppm/4hr
Chronic Toxicity: Prolonged or repeated exposure can result in dermatitis, respiratory issues, possible sensitization
Skin Corrosion/Irritation: Corrosive, can cause severe burns
Eye Damage: Severe irritation, risk of permanent injury
Respiratory Sensitization: Irritant, may cause bronchospasm, difficulty breathing
Carcinogenicity: Not listed by NTP, IARC, or OSHA as a known carcinogen
Other Effects: May cause headaches, nausea, methemoglobinemia in high exposure cases
Aquatic Toxicity: Harmful to aquatic organisms, possible long-term effects in aquatic environments
Persistence/Degradability: Readily biodegradable in water and soil
Mobility: High mobility in soil and water
Bioaccumulation: Unlikely to persist or bioaccumulate significantly
Other Effects: May raise pH of aquatic systems causing ecosystem imbalance
Waste Treatment Methods: Dilute with water under controlled conditions and neutralize with dilute acid; use approved incineration or chemical destruction
Disposal Containers: Use only approved, leak-proof chemical containers
Disposal of Contaminated Packaging: Rinse thoroughly and dispose in accordance with local, state, and federal regulations
Precautions: Do not allow material to reach drains or watercourses; consult specialized hazardous waste disposal services
UN Number: 1061
UN Proper Shipping Name: Methylamine, anhydrous
Transport Hazard Class: 2.1 (Flammable gas)
Packing Group: Not applicable
Label: Flammable Gas
Environmental Hazards: May be marine pollutant
Special Precautions: Secure cylinders, clearly label, transport in upright position with proper ventilation; follow all legal requirements
US OSHA: Covered under Hazard Communication Standard
TSCA Status: Listed
SARA Title III Section 302/304/313: Listed as an Extremely Hazardous Substance
Canada WHMIS Classification: Compressed Gas, Toxic Material, Corrosive Material
EU Classification: F+; T; N; R12-23/24/25-34-50
Other Regulations: Subject to Transport of Dangerous Goods Rules, International Air and Maritime transport regulations, local hazardous substance regulations
