Product Name: Dimethyl Methylphosphonate (DMMP)
Chemical Formula: C3H9O3P
Synonyms: Methylphosphonic acid, dimethyl ester; Methylphosphonic acid dimethyl ester
CAS Number: 756-79-6
Intended Use: Mainly seen in flame retardants, plasticizer chemistry, organic synthesis labs
Manufacturer Contact: Supplied from chemical distributors; safety and contact number must appear on label or accompanying documentation
Emergency Phone: Always consult manufacturer’s emergency line on shipment papers
GHS Classification: Acute toxicity (oral and inhalation), skin and eye irritation possible
Signal Word: Warning
Hazard Statements: Harmful if swallowed, harmful if inhaled, causes eye and skin irritation
Pictograms: Exclamation mark
Routes of Exposure: Ingestion, inhalation, skin contact, eye contact
Possible Symptoms: Throat and digestive discomfort, coughing, irritation, redness in skin or eyes
Chemical Name: Dimethyl Methylphosphonate
Concentration: More than 99% pure (technical grade); trace water or alcohols may be present depending on supplier
CAS Number: 756-79-6
Impurities: Trace impurities determine toxicity; main ingredient dominates hazard profile
Inhalation: Take person to fresh air, keep comfortable, rinse mouth if needed
Skin Contact: Remove contaminated clothing, wash skin thoroughly with water, use soap if available
Eye Contact: Rinse eyes gently with running water for at least 15 minutes, remove contact lenses if easy
Ingestion: Rinse mouth, do not induce vomiting, drink water to dilute, seek medical attention
Most Important Symptoms: Irritation, headache, possible nausea; alert paramedics to chemical exposure details
Medical Attention: Fast medical evaluation important for large exposures, bring MSDS to clinic or hospital
Suitable Extinguishing Media: Foam, dry chemical, water spray, or CO2 fire extinguishers
Specific Hazards: Vapors can be irritating, may release phosphorus oxides and other toxic fumes
Protective Equipment: Chemical-resistant suits, self-contained breathing apparatus for fire teams
Precautions: Stay upwind of fire, avoid runoff entering sewers or waterways, cool containers with water spray
Personal Precautions: Wear gloves, goggles, and suitable protective clothing; avoid breathing vapor or mist
Environmental Precautions: Prevent spill from reaching water bodies, soil, or drains
Spill Clean-Up Methods: Use absorbent (sand, vermiculite), collect residue into sealable drums, ventilate area
Disposal: Use certified chemical waste contractor for collected material, never pour down drain
Handling: Work in well-ventilated area, avoid direct contact or inhalation, keep containers tightly closed; wash hands after handling
Storage: Store in cool, dry, well-ventilated facility away from heat sources and incompatible substances (acids, oxidizers, bases)
Container: Use original or compatible chemical-resistant containers with properly labeled hazard information
Occupational Exposure Limits: No established OSHA or ACGIH exposure limits in most locations; consult local guidance
Engineering Controls: Use chemical fume hood or local exhaust ventilation
Personal Protective Equipment: Nitrile gloves, splash goggles, protective lab coat or coveralls; use vapor respirator if ventilation insufficient
Hygiene Measures: Wash hands and exposed skin thoroughly with soap and water before eating, drinking, smoking, or leaving work area
Appearance: Clear, colorless liquid
Odor: Weak, slightly sweet or chemical odor
Molecular Weight: 124.08 g/mol
Boiling Point: 181°C (358°F)
Melting Point: -50°C (-58°F)
Density: 1.145 g/cm³ @ 20°C
Vapor Pressure: 0.5 mmHg @ 20°C
Solubility: Miscible with water and many organic solvents
Flash Point: 82°C (179°F) closed cup
Auto-Ignition Temperature: 527°C (980°F)
pH: Neutral to slightly acidic in solution
Chemical Stability: Stable under standard storage conditions
Incompatible Materials: Strong oxidizing agents, strong acids and bases
Hazardous Decomposition Products: Phosphorus oxides, carbon oxides, methylphosphonic acid, toxic fumes
Polymerization: Not expected under normal conditions
Conditions to Avoid: Prolonged heating, open flames, spark sources, UV light
Routes of Exposure: Inhalation, ingestion, skin, and eyes
Acute Toxicity: LD50 oral (rat): 825–1880 mg/kg; LD50 dermal (rabbit): >5,000 mg/kg
Irritation: May cause irritation to eyes, skin, and respiratory tract
Chronic Effects: No data on long-term effects in humans; some animal data suggest mild neurological and liver impact at very high exposure
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, OSHA
Aquatic Toxicity: Harmful to aquatic organisms in concentrated form
Persistence and Degradability: Moderately persistent, slow breakdown in water and soil
Bioaccumulation Potential: Low; does not easily build up in food chains
Environmental Fate: Water soluble, may migrate in groundwater; use strong controls on accidental releases near waterways
Disposal Impact: Avoid direct release to the environment, never rinse into sewers
Waste Disposal: Send to licensed chemical disposal contractor; burn or bury using approved techniques only
Contaminated Packaging: Rinse containers with water, treat as hazardous waste; do not reuse or puncture
Legislation: Dispose of following local, state, national, and international regulations; document the waste transfer
UN Number: 2810
Shipping Name: Toxic liquid, organic, n.o.s. (contains Dimethyl Methylphosphonate)
Transport Hazard Class: 6.1 (Toxic Substances)
Packing Group: III
Special Precautions: Avoid transport with food and animal feed, seal securely, ensure labeling shows toxic warning symbols
Regulations: Follow U.S. DOT, IATA, IMDG rules for toxic liquid shipments
OSHA: Listed as hazardous chemical under HazCom; keep workplace records up to date
SARA Title III: Not on the list of extremely hazardous substances, but subject to reporting for spills
TSCA: Listed
REACH: Subject to registration in the EU
Other Regulations: Restrictions in place for chemical weapon precursor usage, subject to government tracking for certain purchasers
Label Elements: Ensure GHS-compliant pictograms and signal words on all storage and shipping units
