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Substance name: Methyl Acetoacetate Chemical formula: C5H8O3 Synonyms: MAA, acetoacetic acid methyl ester CAS number: 105-45-3 Appearance: Clear colorless liquid, sometimes carrying a faint odor Common uses: Intermediary in pharmaceuticals, flavors, agrochemicals
Hazard class: Flammable liquid; can irritate skin, eyes, and respiratory system Main risks: Vapors can catch fire easily; exposure may cause headaches or nausea Chronic exposure: Repeated skin contact dries and cracks skin; inhaling large amounts brings greater health risks Pictograms: Flammable, Health hazard
Ingredient: Methyl acetoacetate Concentration: 99% or more in most commercial forms Impurities: Usually present in trace amounts, not typically listed unless they pose health hazards
Inhalation: Move to fresh air quickly; breathing trouble can call for medical help Eye contact: Rinse eyes with water for several minutes, keep eyelids open Skin contact: Wash area with soap and water, strip off contaminated clothing Swallowing: Do not make person vomit; rinse mouth, seek medical assistance
Suitable extinguishing media: Dry chemical, foam, carbon dioxide Specific hazards: Combustion releases toxic fumes, including carbon monoxide Protective equipment: Firefighters use self-contained gear and avoid inhaling vapors Special instructions: Stay upwind from fire, cool containers near flames with water spray
Personal protection: Ventilate area, wear gloves and eye protection Environmental precautions: Prevent material from entering sewers or waterways Spill cleanup: Use inert absorbent like sand, scoop up, store in closed container Waste disposal: Follow local regulations; keep it out of storm drains
Safe handling: Use in well-ventilated areas, avoid direct skin and eye contact Storage conditions: Keep closed, away from heat, open flames and oxidizers Packaging: Use chemical-resistant drums or bottles kept out of sunlight Special notes: Ground and bond containers when dispensing to prevent static sparks
Ventilation: Use fume hoods or exhaust fans to reduce vapor buildup Personal protective equipment: Safety glasses, gloves impervious to chemicals, lab coat Respiratory protection: Respirators come out for high vapor levels or poor ventilation Exposure limits: No established legal limits in most locations, but staying below 10 ppm as a guideline lowers risk
Physical state: Liquid Color: Ranges from colorless to pale yellow Odor: Mild, sweet, sometimes like fruit Boiling point: Near 169°C Flash point: Roughly 63°C Solubility: Mixes with water in small amounts, better in ethanol and ether Density: About 1.08 g/cm³ at 20°C
Chemical stability: Stays stable under normal room conditions, can slowly form peroxides on air contact Reactive conditions: Avoid strong oxidizers, acids, or bases Decomposition products: Carbon oxides, acetic acid, methane in severe heat Potential hazards: Heating above flash point increases ignition danger
Routes of exposure: Swallowing, breathing vapors, skin absorption Acute effects: Exposure brings irritation to eyes and airways, headache, drowsiness Long-term risks: Repeated low doses can dry skin and sensitize, kidney effects reported in lab animals at higher exposures Aspiration hazard: Swallowing and breathing in vapor both raise risk—never siphon by mouth
Aquatic effects: Harmful to water organisms in larger concentrations Persistence and degradability: Tends to break down under sunlight and microbes Bioaccumulation: Not likely to build up in living things, but quick large spills bring short-term problems Soil mobility: Moves through soil, could reach groundwater if not contained
Disposal method: Burn in approved incinerators or deliver to hazardous waste specialists Container precautions: Triple-rinse and puncture empty containers before discarding Regulatory aspects: Local and national rules apply, often bans ejection in household or municipal waste
Shipping classification: Flammable liquid, UN number required for bulk transport Packing group: III, moderate hazard Transport notes: Vehicles carrying larger loads must label boxes and carry spill containment kits Precautions: Keep upright, away from heat or possible sparks
Labeling requirements: Flammable, possible health hazard pictograms Restriction highlights: Some regions restrict commercial use or impose extra reporting above certain amounts SDS requirements: Safety Data Sheets needed for workplaces and shipping Worker safety standards: Employers responsible for proper training and clear spill instructions
