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Chemical Name: 2-Methyl-3-Pentanone
Synonyms: Methyl sec-butyl ketone
CAS Number: 565-69-5
Appearance: Clear, colorless liquid
Odor: Unmistakable, sharp, acetone-like smell fills the workspace fast, a heads-up every time someone cracks the cap.
Recommended Use: Used as a solvent. Ask anyone who’s worked a solvent bench—chemists don’t forget to keep this one checked due to its volatility.
Classification: Flammable liquid, irritant
Hazard Pictograms: Flame, Exclamation mark
Hazard Statements: Catches fire easily; causes eye and skin irritation; inhaling vapor leads to drowsiness or dizziness.
Precautionary Statements: Avoid sparks, hot surfaces, and open flames. Don’t breathe the vapor. Wash hands after handling. Use protective gloves, goggles, and if you don’t want a splitting headache at the end of the day, keep the ventilation strong. Even the most safety-conscious people get caught off guard by quick evaporation and a strong headache if they're lazy about PPE.
Ingredient: 2-Methyl-3-Pentanone
Concentration: Typically pure—the simplicity doesn’t excuse not double-checking bottle labels since variants sometimes get stored together.
Eyes: Rinse with water for several minutes, lifting eyelids. If irritation sticks around, get checked out by a professional.
Skin: Remove contaminated clothing. Wash with soap and water. Skin reactions might not show for a bit—don’t shrug off tingling or redness.
Inhalation: Out to fresh air right away. Anyone old enough to remember that sharp solvent whiff will agree—never take shallow breathing for granted.
Ingestion: Don’t induce vomiting. Rinse mouth and get medical help. True for this ketone as with most lab organics—you won’t shake nausea just waiting around for symptoms to fade.
Suitable Extinguishing Media: Foam, dry chemical, CO2. Water can spread spilled material.
Hazards: Vapors form explosive mixtures with air and travel fast. Firefighters get told to watch for low flash points. Anyone in shop safety walks should know these vapors sink and reach ignition sources at ankles.
Special Equipment: Self-contained breathing apparatus and structural turnout gear—better to sweat through layers than try to air out lungs after a room full of smoke and chemical fumes.
Personal Protection: Evacuate the area if necessary. Use gloves, chemical splash goggles, and chemical-resistant aprons. Workers who get too casual face slippery floors and headaches.
Spill Cleanup: Ventilate area. Absorb with sand or earth, shove into metal containers. Avoid water—prevents spreading. Getting a spill under control depends on hustle and teamwork, and leaving puddles is a rookie mistake.
Handling: Work in well-ventilated spaces. Ground and bond containers while transferring. Keep out of direct sunlight, away from static, sparks, and hot surfaces. Real job site experience says don’t wear synthetic clothes, as static is a bigger problem than most manuals let on.
Storage: Keep in tightly sealed containers, in cool, dry, explosion-proof rooms. Never store with oxidizers or acids—someone will always have a story about learning that lesson the hard way.
Engineering Controls: Good general ventilation. If levels get high, opt for local exhaust.
Personal Protection: Nitrile or neoprene gloves, safety goggles, flame-resistant lab coats.
Respiratory Protection: Organic vapor respirator in poorly ventilated spaces.
Exposure Limits: Not sharply defined for 2-Methyl-3-Pentanone, but similar ketones trigger symptoms at low exposures, so err on the side of caution. Long-timers know headaches, dizziness, and skin irritation stack up over time.
Physical State: Liquid
Color: Colorless
Odor Threshold: Detectable at low concentrations—easy to notice leaks or spills without fancy sensors.
Boiling Point: Around 120 °C
Melting Point: Below -50 °C
Vapor Pressure: Moderate at room temperature
Flash Point: About 22 °C (open cup)—sets the tone for how careful storage needs to be.
Solubility: Slightly soluble in water, mixes well with organics
Density: About 0.8 g/cm³
Evaporation Rate: Rapid enough to pay attention to small open vessels—solvent bills and air quality take a hit.
Stability: Stable under normal conditions, but reacts around strong oxidizers.
Reactivity: Forms explosive peroxides if left open too long—a reason for regular bottle checks and shelf-life reminders.
Conditions to Avoid: Heat, sparks, open flames, and long-term air exposure.
Incompatible Materials: Oxidizing agents, acids, bases—cross-contamination stories always float through poorly labeled labs.
Hazardous Decomposition: Carbon monoxide, carbon dioxide—especially under fire. Any lab veteran who’s smelled burnt ketone won’t want a repeat experience.
Acute Effects: Irritates skin, eyes, and respiratory tract. Inhalation leads to headache, nausea, and central nervous system symptoms. Industry old-timers remember this stuff giving people a “solvent hangover” faster than you’d think.
Chronic Effects: Prolonged exposure sets up dermatitis or drives up risk for nervous system issues—numb fingers, shaky hands, poor focus. Keeping track of long days in enclosed areas means tracking time around open bottles.
Routes of Exposure: Skin, eyes, inhalation, ingestion.
Carcinogenicity: No clear data linking 2-Methyl-3-Pentanone to cancer, but solvent exposure in general gets flagged for caution.
Toxicity: Harmful to freshwater life if it enters waterways. People dumping old solvents down the drain still do it, even though it mucks up wastewater plants and hurts fish. It builds up in the ecosystem and doesn’t break down as fast as you’d like.
Persistence: Moderate—sticks around in soils and water.
Mobility: Moves through soil or drains quickly due to low viscosity and high volatility.
Bioaccumulation: Not expected to build up in food chains. Still, repeated releases magnify the impact.
Waste Handling: Dispose as hazardous chemical waste—never down the sink or together with household trash.
Contaminated Packaging: Rinse only if allowed, then discard as hazardous waste as well. Shops that tried shortcuts ended up paying for environmental cleanup.
Regulations: Local and national hazardous waste rules apply. Proper labeling keeps waste haulers and landfill operators safe.
UN Number: 1224
Proper Shipping Name: Ketones, liquid, n.o.s. (contains 2-Methyl-3-Pentanone)
Transport Hazard Class: 3 (flammable liquid)
Packing Group: II (medium danger)
Special Precautions: Secure tightly, label clearly. Vehicles carrying large volumes need proper fire suppression and ventilation. Drivers remember shipping logs get checked, and tight seals on drums go a long way toward avoiding fines and spills.
US Regulatory: Listed as flammable and hazardous by OSHA, managed under SARA Title III, CERCLA.
International: Covered by the European Union’s REACH guidelines, plus similar chemical safety mandates in Canada, Asia, and Australia.
Labeling: Label as required on all secondary containers; don’t rely on sticky tape and faded markers—people make mistakes in a rush.
Worker Guidelines: Training on safe handling and spill response matters for new and veteran hires alike. Employers in real-life workplaces know orientations save skin burns and insurance headaches. Staying current with updates prevents gaps in compliance and daily safety.
