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Chemical Name: Methacrylic Anhydride
Common Synonyms: 2-Methyl-2-propenoic anhydride
CAS Number: 760-93-0
Physical State: Colorless, clear liquid
Odor: Acrid, pungent
Molecular Formula: C8H10O3
Main Hazards: Corrosive to skin, eyes, and respiratory system
GHS Classification: Skin Corrosion/Irritation: Category 1, Eye Damage: Category 1, Acute Toxicity: Oral and Dermal - Category 4
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage, harmful if swallowed, causes respiratory irritation
Major Risks: Immediate injury on contact, potential for severe respiratory outcomes in poorly ventilated spaces
Methacrylic Anhydride Content: More than 90% purity
Impurities: Trace amounts of methacrylic acid and polymerization inhibitors
Physical Additives: Often stabilized with trace inhibitors to reduce runaway reactions
Skin Contact: Flush with large volumes of water for at least 15 minutes, remove contaminated clothing
Eye Contact: Rinse cautiously with water for several minutes, seek immediate medical care
Inhalation: Move to fresh air, ensure breathing is not labored; oxygen may help; medical attention is necessary if symptoms persist
Ingestion: Rinse mouth with water, avoid inducing vomiting, get professional attention without delay
Long-Term Concerns: Exposure can lead to burns, scarring, and ongoing respiratory issues if not treated swiftly
Suitable Extinguishing Media: Use foam, dry chemical, or carbon dioxide; avoid water jets
Combustion Hazards: Fumes of carbon monoxide, carbon dioxide, and possibly acrylic acid may result
Protective Equipment: Firefighters should use self-contained breathing apparatus and full protective gear
Special Procedures: Approach from upwind to contain vapors and avoid inhaling decomposition products
Precautions: Ensure adequate ventilation, stay upwind of spill
Personal Protection: Chemical-resistant gloves, goggles, face shield, long sleeves
Containment: Dike with non-combustible absorbent materials like sand; prevent entry into drains
Clean-Up: Use clean, non-sparking tools to pick up and remove spill; ventilate area well
Disposal: Collected material goes with hazardous waste under local regulations
Handling Methods: Avoid breathing vapors and direct skin or eye contact, use local exhaust ventilation
Safe Storage: Store in a tightly closed container, away from moisture, direct sunlight, and incompatible chemicals such as strong bases and oxidizers
Protect against: Heat sources, polymerization triggers
General Practices: Incorporate proper labeling, maintain spill control and eyewash stations, and keep containers dry
Engineering Controls: Work in fume hoods or well-ventilated environments, implement closed systems where possible
Personal Protective Equipment: Impermeable gloves, chemical splash goggles, face shields, and protective clothing for the whole body
Respiratory Protection: Use NIOSH-approved respirators when handling large quantities or during spill responses
Hygiene Measures: Wash hands thoroughly after handling, avoid eating, drinking, or smoking in areas of use
Exposure Limits: Limited data available; treat as a strongly hazardous substance with no safe exposure threshold
Appearance: Colorless liquid
Boiling Point: Around 112°C
Melting Point: Below room temperature
Flash Point: Below 100°C (closed cup)
Solubility: Reacts with water, not freely miscible
Odor Threshold: Low, detection at low concentrations
Vapor Pressure: Moderate at room temperature
Density: Slightly less than water, about 1.035 g/cm³
pH: Not applicable; hydrolyzes in water to acidic solution
Chemical Stability: Tends to polymerize in presence of heat, moisture, or contamination
Hazardous Reactions: Vigorous reaction with water, forming methacrylic acid; possible exothermic polymerization with strong bases or peroxides
Incompatible Materials: Strong oxidizers, acids, bases, moisture
Decomposition Products: Acrylic acid, carbon oxides
Acute Toxicity: Harmful if ingested, inhaled, or upon skin contact
Corrosivity: Causes severe irritation and burns to skin, eyes, and mucous membranes
Chronic Effects: Prolonged or repeated exposure risks dermatitis and long-term respiratory harms
Sensitization: May cause allergic reactions in susceptible individuals
Carcinogenicity: No reputable evidence linking to cancer in humans, but not enough data to rule out hazard
Environmental Fate: Reacts with water, forming methacrylic acid, which can lower pH locally
Aquatic Toxicity: Toxic to aquatic organisms, likely to cause long-term negative impacts in the environment
Persistence and Degradation: Breaks down through hydrolysis but breakdown products may remain harmful
Community Risk: Release to waterways can disrupt aquatic life and downstream water users
Waste Method: Incinerate in a chemical incinerator equipped with afterburner and scrubber
Alternative Disposal: Consult local authorities for hazardous waste collection and treatment
Container Management: Decontaminate, puncture and render empty containers unusable before disposal
Do Not: Flush into drains, waterways, or soil
UN Number: 2531
Hazard Class: Corrosive and flammable liquid
Packing Group: II
Transport Advice: Use corrosion-resistant containers, clear hazard labeling, and keep upright during travel
Spill Protocol: Emergency teams should have access to full PPE, containment, and ventilation equipment
Classification: Strictly regulated as a corrosive and hazardous chemical
Labeling Requirements: GHS pictograms and clear statements of risk
Restrictions: Tight controls on public and occupational exposure levels
Documentation: Facilities must keep up-to-date usage, storage, and disposal records for official review
