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Chemical Name: 3-Methyl-1-pentene
Molecular Formula: C6H12
Description: Colorless liquid with a faint hydrocarbon odor
Synonyms: 3-Methylpent-1-ene
CAS Number: 107-83-5
Classification: Flammable liquid, possible irritant to eyes and skin
Hazard Statements: Liquid and vapor ignite easily, fumes can irritate respiratory tract, high concentrations may cause dizziness or headache, skin contact dries or cracks skin
Pictograms: Flame symbol often marks containers in labs and storage
Label Warnings: “Keep away from heat, sparks, open flames” usually printed boldly; avoid inhaling vapors or direct spill on body
Main Component: 3-Methyl-1-pentene (nearly pure in most lab and industrial sources)
Impurities: Trace amounts of similar hexenes or methylpentene isomers, which change slightly based on manufacturing process
Concentration: Often provided at 98% or higher in controlled environments
Eye Contact: Flush eyes with water for several minutes, keep lids open, remove contact lenses
Skin Contact: Wash with mild soap and water, remove contaminated clothing, avoid delayed attention because dryness or redness may develop
Inhalation: Move to fresh air, keep person at rest, supply oxygen if breathing feels strained
Ingestion: Rinse mouth, don’t induce vomiting, seek medical check if any symptoms appear
Suitable Extinguishing Media: Use dry chemical, foam, or CO2; water spray may help cool nearby surfaces but could spread liquid
Fire Hazards: Vapors form explosive mixtures with air, heavier than air so they sink and travel far, sources of ignition need strict control
Special Protective Equipment: Use self-contained breathing apparatus and chemical-resistant gear in confined fires
Decomposition Products: Burning produces carbon monoxide, carbon dioxide and possibly other hydrocarbons
Personal Precautions: Wear gloves and goggles, control sparks and open flames nearby
Spill Response: Absorb liquid with inert materials such as sand or earth, ventilate area, avoid release into sewers or waterways
Cleanup: Use explosion-proof equipment for cleanup, seal waste in labeled containers for later disposal
Handling: Operate in well-ventilated spaces, close containers tightly after use, ground and bond vessels to prevent static build-up
Storage: Keep away from sources of ignition, store in cool, dry locations with proper spill containment, segregate from oxidizing agents and acids
Exposure Limits: No precise occupational exposure limit commonly recognized, but keeping concentrations minimized a standard practice
Engineering Controls: Use fume hoods or local exhaust systems in labs, regularly check ventilation
Personal Protection: Nitrile gloves, goggles or face shield, chemical-resistant apron for extended contact jobs, respirators required in poorly ventilated spaces
Appearance: Clear, colorless liquid
Odor: Slight hydrocarbon smell
Boiling Point: Near 63°C
Melting Point: Below conventional freezer temperatures
Flash Point: Flammable in open air
Density: Lower than water, so spills float
Solubility: Insoluble in water, mixes with many organic solvents
Chemical Stability: Stable in closed containers under normal conditions, heat and open flames accelerate breakdown
Reactivity: Reacts with strong oxidizers, may generate explosive gases in rare mixing scenarios
Hazardous Decomposition: Generates carbon oxides and possibly unburned hydrocarbons if fire occurs
Polymerization: Unlikely in typical storage but may occur with extreme heat or catalysts
Routes of Exposure: Inhalation, skin contact, eye contact, accidental ingestion
Acute Effects: Eye and skin irritation, dizziness, respiratory discomfort at high vapor levels
Chronic Exposure: Not well studied in humans; repeated exposure to similar alkenes dries skin, prolongs headache episodes
Aquatic Toxicity: Spills in freshwater disrupt oxygen transfer, threaten aquatic life by coating gills and disrupting food chains
Environmental Fate: Volatilizes rapidly, persistent hydrocarbons may linger in soil and water
Bioaccumulation: Unlikely in top predators, but small aquatic organisms may suffer longer presence in tissues
Recommended Precautions: Prevent entry into waterways, drain systems, or open soil pits
Waste Methods: Collect spill residues in sealed drums or containers, label as hazardous, arrange for incineration at licensed sites
Do Not: Pour down drains or discard with common trash
Recycling: Only conduct with proper permits and specialized facilities, avoid open-air burning or evaporation
Hazard Class: Flammable liquid
Packing Group: Typically assigned based on boiling and flash point
Labeling: Marked with flame pictogram, “Flammable Liquid” tags required during shipment by rail, road, or air
Storage During Transit: Use metal drums or certified plastic jugs, avoid routes through densely populated or wildlife-sensitive regions whenever possible
Global Listings: Included in chemical inventories of United States, EU, and select Asian countries as a hazardous substance
Worker Safety: OSHA and similar agencies set enforceable standards for ventilation and exposure in factories and labs
Community Prevention: Reporting spills and losses often compulsory, emergency planning needed in neighborhoods near large storage
