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Chemical Name: Pseudocumene
Common Names: 1,2,4-Trimethylbenzene
CAS Number: 95-63-6
Appearance: Clear, colorless liquid with an aromatic odor
Classification: Flammable liquid, health hazard to eyes, skin, respiratory system
Risks: Vapors easily ignite, causing fire or explosion in confined spaces; inhalation can irritate nose, throat, lungs, headache and dizziness often set in after only short exposure; prolonged skin contact may lead to dryness, redness or even cracking; repeated contact sometimes worsens symptoms over time; accidental swallowing creates risk of central nervous system effects, chemical pneumonia, and further complications
Main Ingredient: 1,2,4-Trimethylbenzene (more than 95%)
Other Ingredients: May include trace amounts of 1,2,3-Trimethylbenzene and Mesitylene, given its petroleum source, but those usually do not alter main safety outcomes
Eye Contact: Quickly rinse with plenty of running water, gently lifting eyelids; get medical attention if symptoms persist
Skin Contact: Wash immediately with mild soap and water; contaminated clothing needs removal; irritated skin deserves proper care
Inhalation: Remove from exposure; supply fresh air right away; persistent discomfort requires medical evaluation
Ingestion: Do not induce vomiting; seek professional medical attention quickly; risk of aspiration into lungs is serious
Extinguishing Media: Use foam, dry chemical, carbon dioxide—water streams can spread fire by pushing fuel
Hazards: Extremely flammable liquid and vapor; combustion liberates toxic gases, potentially including carbon monoxide; an enclosed area increases explosion risk fast
Protective Actions: Firefighters need full personal protective equipment and self-contained breathing apparatus; containers exposed to flames need cooling by spray to prevent rupture; leaking vapors heavier than air will spread along ground, seeking ignition sources
Cleanup: Eliminate all ignition sources; ventilate area swiftly; soak up with inert absorbent material like sand or earth; never use sawdust
Precautions: Prevent run-off into drains, sewers, waterways; in case of larger spill, contact authorities; those cleaning should equip suitable gloves and respirators
Safe Handling: Work in well-ventilated places to avoid accumulation of vapors; keep away from sparks, static electricity and open flames; avoid breathing vapors or skin contact
Storage: Store in tightly closed containers in cool, dry areas; protect from direct sunlight and incompatible materials such as strong oxidizers; only trained personnel should access storage locations
Engineering Controls: Local exhaust ventilation helps keep airborne concentrations low; explosion-proof equipment becomes essential where large quantities get handled
Personal Protection: Gloves made of nitrile, neoprene, or another chemical-resistant material; splash-proof goggles or face shield; use organic vapor respirator if ventilation fails to keep levels well below limits; change contaminated clothing quickly
Boiling Point: About 168°C
Melting Point: About -44°C
Flash Point: 44°C (Closed cup)
Vapor Density: Heavier than air
Solubility: Very poorly soluble in water
Odor Threshold: Aromatic smell noticeable at low concentrations
Density: Approximately 0.88 g/cm³
Appearance: Liquid, colorless to pale yellow depending on purity
Chemical Stability: Stable under normal ambient and anticipated storage conditions
Reactivity: Reacts strongly with strong oxidizers, such as nitric acid, hydrogen peroxide, or chlorine derivatives; temperatures above flash point increase fire risk
Decomposition: High heat or fire breaks it down into irritating and toxic compounds like carbon monoxide, smoke
Acute Toxicity: Inhalation causes headache, dizziness, sometimes narcosis or unconsciousness in high concentrations—chronic exposure to high vapor levels can trigger central nervous system effects
Dermal Effects: Direct contact leads to dryness, redness, possibly skin cracking after repeat exposures
Eye Effects: Contact often irritates, leading to tearing and redness
Swallowing: Risk of lung aspiration, nausea, and systemic effects
Long-Term Effects: Chronic exposure may result in kidney, liver or blood disorders as observed with other aromatic hydrocarbons
Environmental Fate: Breaks down in environment but stays present in poorly ventilated or confined areas; rises quickly to water's surface if spilled
Aquatic Toxicity: Larger spills threaten aquatic organisms due to its toxicity and ability to form slicks
Persistence: Does not bioaccumulate significantly but remains a risk to aquatic and soil organisms as solvent
Methods: Incineration under controlled conditions in properly permitted facilities stands as responsible disposal; avoid discharge into drains or environment
Regulations: Waste disposal needs to match local, regional, and national regulations for hazardous material
UN Number: Regulated as a flammable liquid for transport; precautions during transit focus on eliminating sources of heat, flame, static, and sparks
Packing: Secure in leak-proof containers capable of resisting chemical action and pressure swings; labeling as hazardous flammable liquid marks a minimum responsibility during transport
Hazards: Subject to national and international controls for flammable substances and specific aromatic hydrocarbons
Worker Protection: Occupational exposure limits published by agencies such as OSHA or ACGIH; reporting, training, and storage requirements increase for facilities using or storing larger volumes
Community Right-to-Know: Included in lists of hazardous chemicals requiring local notification and emergency planning under chemical safety rules
