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Chemical Name: Ethyl Methyl Carbonate
Common Synonyms: EMC
CAS Number: 623-53-0
Physical Form: Colorless liquid, mild odor, fast evaporating
Main Uses: Lithium-ion battery electrolytes, solvents in chemical synthesis
Routes of Use: Common in lab and industrial scale energy storage manufacturing
Main Risks: Flammable, can aggravate respiratory issues, irritation to eyes and skin, mild central nervous system symptoms when inhaled in high amounts
Exposure Routes: Inhalation, skin contact, accidental ingestion
Potential Immediate Hazards: Fire and explosion risks at low flash points, fumes irritate lungs, may cause dizziness
Long-Term Concerns: Chronic exposure may increase respiratory sensitivity, amplifying reactions to future exposures
Signal Words on Labels: Danger (high flammability), Warning (eye and skin irritant)
Active Ingredient: Ethyl Methyl Carbonate (purity often above 99%)
Impurities: Smaller amounts of methanol, ethanol, trace water, catalysts from production
Physical Formula: C4H8O3
Inhalation: Remove to fresh air, support breathing, seek medical advice if discomfort remains, monitor for coughing or dizziness
Skin Contact: Wash with soap and water, remove soaked clothing, treat persistent irritation with medical attention
Eye Contact: Rinse with clean water for at least 15 minutes, hold eyelids apart, consult an eye specialist if pain or redness continues
Ingestion: Do not induce vomiting, rinse mouth, get immediate medical help
Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide; water sprays work best for cooling storage containers
Special Hazards: Vapors may travel and ignite at distant points; fire produces carbon oxides and toxic gases
Protective Gear: Use self-contained breathing apparatus, chemical-resistant suit, stay upwind
Safety Tips: Move containers away from heat if safe to do so, cool surfaces with water to prevent pressure build-up
Personal Protection: Wear goggles, gloves, long sleeves, and stay in ventilated areas
Spill Response: Eliminate ignition sources, use absorbent sand or vermiculite, contain and collect in tightly sealed drums
Clean-Up: Ventilate, wash residue with water but avoid letting runoff reach waterways
Waste Disposal: Dispose under guidance from environmental authorities, as liquid waste with high flammability cannot go with regular solid waste
Storage: Keep in cool, dry chemical storage areas, tightly closed drums or bottles, shaded from direct sunlight with good ventilation
Handling: Ground all equipment to avoid static build-up, avoid breathing vapors, never handle around open flames, carefully pour to minimize splashes
Incompatible Materials: Avoid contact with oxidizers, acids, strong bases as these can trigger dangerous reactions
Engineering Controls: Use fume hoods, vented enclosures, explosion-proof electrical systems
Personal Protection: Chemical goggles for eyes, nitrile gloves for hands, lab coats or full coverage clothing, sometimes full-face respirators where vapors collect
Work Habits: Wash hands thoroughly after work, never eat or drink in the area, always label transfer containers
Appearance: Clear colorless liquid
Odor: Ether-like, faintly sweet
Boiling Point: Around 107°C
Flash Point: Around 25°C (highly flammable)
Melting Point: Near -55°C
Vapor Density: Heavier than air
Solubility: Miscible with many organic solvents, limited solubility in water
Explosive Properties: Vapors form explosive mixtures with air
Stability: Stable under cool, dry, isolated storage, but quickly breaks down in heat or with acid contact
Reactive Hazards: Violent reaction with strong acids and oxidizers, heat triggers fire risk
Hazardous Byproducts: Combustion produces carbon monoxide, carbon dioxide, possibly smaller organic fragments
Acute Effects: Vapors bring drowsiness, headache, throat irritation, eye watering; skin dries out with repeat exposure
Chronic Effects: May worsen pre-existing asthma, causes increased sensitivity to solvents after long-term handling
Carcinogenicity: No clear links, but always prioritize proper ventilation and PPE to reduce risk
Routes of Entry: Inhalation remains most common in workplace settings
Aquatic Impact: EMC can harm water organisms; high concentrations deplete oxygen, disrupt fish and microbe activity
Degradation: Breaks down with sunlight and microbes, but persists if spilled in large amounts
Bioaccumulation: Not likely in food chains, still warrants care with waste
Spill Impact: Avoid runoff to soil and drains to keep groundwater safe
Waste Disposal: Collect all waste, drain off excess, send to hazardous chemical burn facility
Labeling: Clearly mark containers as flammable solvent waste, store tightly until collection
Never Pour Down Drains: EMC disrupts water treatment and reaches natural waterways, so always keep it separate
Classification: Dangerous goods by road, air, and sea
Packing Group: Flammable liquid category, requires explosion-proof transit
Handling: Keep drums upright, pad to absorb movement, never ship with acids or oxidizers
Labeling: DOT/UN flammable liquid label, with plain warnings on every package
Compliance: Listed under national and international dangerous goods codes for storage and transport
Labels: Flammable liquid warnings required by OSHA and GHS guidelines
Personal Protection: Mandatory PPE in regulated plants, required documentation for each shipment
Reporting: Large spills trigger mandatory environmental authority reports and cleanup plans
Public Health Law: Restricted in many urban and residential zones due to fire risk; must document storage and use
