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Chemical Name: 1-Methyl-4-Propylbenzene
Synonyms: 4-n-Propyl-toluene
CAS Number: 1074-19-5
Molecular Formula: C10H14
Physical Appearance: Colorless liquid
Odor: Aromatic, similar to other alkylbenzenes
Main Hazards: Flammable liquid and vapor. Can irritate eyes, skin, respiratory tract. Fire generates toxic fumes. May cause drowsiness or dizziness if inhaled in large amounts.
GHS Classification: Flammable liquids (Category 3), Skin irritation (Category 3), Specific target organ toxicity - single exposure (Category 3)
Signal Word: Warning
Pictograms: Flame, Exclamation Mark.
Precautionary Statements: Keep away from heat, sparks, open flames. Avoid breathing vapors. Use only outdoors or in well-ventilated areas. Wear protective gear.
Chemical Composition: Contains 1-Methyl-4-Propylbenzene near 100 percent by weight.
Impurities: May include trace amounts of related alkylbenzenes if synthesized by common methods, mostly as low-level background rather than as major hazards.
Inhalation: Move affected person to fresh air. Breathing may become difficult, coughing common. If symptoms persist, seek medical attention.
Skin Contact: Remove contaminated clothing. Wash skin with soap and water for at least fifteen minutes. Irritation sometimes lingers; medical advice helps if skin problems arise.
Eye Contact: Rinse eyes with plenty of clean water for several minutes, holding eyelids open. Persistent irritation or pain calls for a medical exam.
Ingestion: Rinse mouth thoroughly. Never give anything by mouth to an unconscious person. If symptoms develop, get immediate medical advice.
Suitable Extinguishing Agents: Foam, dry chemical, carbon dioxide. Water spray cools exposed containers but doesn't reliably extinguish chemical fires.
Hazards from Fire: Burning releases irritating and potentially harmful vapors such as carbon monoxide, carbon dioxide, smaller aromatic compounds.
Precautions for Firefighters: Use self-contained breathing apparatus. Wear full protective gear. Ventilate area thoroughly after fire control.
Special Procedures: Containers near heat may rupture due to pressure buildup. Remove containers from fire area if possible to do so safely.
Personal Precautions: Avoid skin and eye contact. Avoid breathing vapors. Remove ignition sources.
Environmental Measures: Prevent entry into watercourses and sewers. Alert local authorities in case of large spills.
Cleanup Methods: Use inert absorbent material such as sand or vermiculite for small spills. Gather for disposal in appropriate chemical waste containers. Wash contaminated area with detergent and water.
Handling: Wear chemical-resistant gloves, safety goggles, and protective clothing. Work in well-ventilated spaces. Keep containers closed between uses. Minimize formation of vapor or mist.
Storage: Store in cool, fireproof area with good ventilation. Keep away from oxidizers, strong acids, and ignition sources. Use containers made for flammable liquids. Label containers clearly.
Engineering Controls: Use mechanical exhaust or local ventilation to keep airborne concentrations below recommended exposure levels. Avoid confined spaces.
Respiratory Protection: Use organic vapor cartridges if ventilation isn't sufficient.
Hand Protection: Butyl rubber or nitrile gloves work well.
Eye Protection: Chemical splash goggles guard against accidental splashes.
Skin Protection: Long sleeves and lab coats, chemical-resistant apron for larger volumes.
Appearance: Clear, colorless to slightly yellowish liquid
Odor: Distinct aromatic hydrocarbon smell
Boiling Point: Approximately 200–210 °C
Melting Point: Below room temperature
Vapor Pressure: Low at room temperature, rises with heat
Solubility: Insoluble in water, soluble in organic solvents such as ethanol and ether
Flash Point: Around 70–80°C, so not the most volatile but still requires caution
Chemical Stability: Stable at normal temperatures and pressures if handled properly.
Incompatibilities: Vigorous reactions with strong oxidizers. Avoid contact with acids and peroxides.
Hazardous Decomposition: At high temperatures, breaks down into smaller aromatics, carbon monoxide, carbon dioxide.
Polymerization Risk: Not known to polymerize under typical storage or handling.
Routes of Exposure: Inhalation, skin, and eye contact.
Potential Health Effects: Short-term exposure irritates eyes, skin, and lungs. Headache, dizziness, and nausea may follow inhalation of high vapor levels. Prolonged skin contact sometimes leads to dryness or red rash. Acute oral toxicity data isn’t detailed for humans, but general caution is needed due to resemblance to other alkylbenzenes.
Carcinogenicity: Not classified as carcinogenic by major authorities, but long-term effects of related substances prompt careful use.
Chronic Effects: Rare with normal handling; repeated exposure without protection can lead to dermatitis or nervous system effects.
Aquatic Effects: Harmful to aquatic life. Poorly soluble in water, but even minor releases contaminate surface waters.
Mobility: Doesn’t migrate far in soil because of low water solubility and tendency to cling to organic material.
Persistence and Degradability: Breaks down slowly in the environment, due to aromatic ring structure. Some risk of accumulation in wildlife.
Bioaccumulation: Potential for build-up in aquatic organisms, so limiting releases helps protect ecosystems.
Disposal Methods: Incineration at licensed facility is the most effective disposal option. Do not pour down drains or into the environment.
Container Cleaning: Rinse empty containers with suitable solvent, then send for recycling or supervised disposal.
Legal Requirements: Dispose under local and national hazardous waste controls. Waste tracking prevents mishandling.
UN Number: Usually shipped as a flammable liquid, specific classification may vary.
Hazard Class: 3 (Flammable Liquids)
Packing Group: III, signifying moderate hazard
Labeling: Red diamond with flame symbol; clear hazard designation reduces accidents during transit.
Precautions: Secure containers, keep upright, avoid stacking. Transport vehicles require proper ventilation.
Chemical Inventories: Listed on major chemical inventories such as TSCA in the US.
Workplace Limits: Some jurisdictions have exposure limits based on related aromatics; consult local standards.
Restrictions: Use in consumer products may face tighter controls due to flammability and potential for misuse.
Employee Protection: Right-to-know laws support training and information for anyone expected to handle the chemical at work.
