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Name: O-Xylene
Chemical Formula: C8H10
Common Uses: O-xylene comes up a lot in the manufacture of phthalic anhydride, paints, varnishes, and as a solvent for resins and dyes. You might find it in numerous industrial settings, from chemical plants to coating factories. While some folks rarely think of it in daily life, it does hide out in automotive products, adhesives, and cleaning fluids.
Hazard Class: Flammable liquid, health hazard
Major Risks: O-xylene catches fire easily, giving off hazardous fumes. Breathing in its vapors leads to headaches, dizziness, and throat irritation. Longer or repeated exposure can bring liver and kidney troubles. Getting it on your skin can dry it out or trigger redness. Its vapor in high amounts knocks a person unconscious in a closed space.
Chemical Name: O-Xylene
CAS Number: 95-47-6
Typical Concentration: 98% or more
Impurities: May include small amounts of other xylene isomers, ethylbenzene.
Inhalation: Bring affected person outside for fresh air. Call medical help if symptoms linger.
Skin Contact: Wash thoroughly with soap and water. Remove contaminated clothing.
Eye Contact: Rinse eyes carefully with water for at least 15 minutes, holding eyelids open.
Swallowing: Do not make the person vomit. Go straight to a healthcare professional.
Fire Risks: O-xylene forms explosive mixtures with air. Vapors spread along floors and can ignite from a distant spark.
Extinguishing Methods: Use foam, dry chemical, or carbon dioxide. Water spray cools exposed surfaces and keeps vapors from building up.
Special Protective Gear: Fire crews should use self-contained breathing apparatus.
Small Spills: Mop up with an absorbent material—sand or earth works if nothing else is around. Keep away from ignition points and ventilate well.
Large Spills: Dike area to stop spread. Use non-sparking tools for cleanup. Wear gloves and goggles. Avoid letting the chemical get into drains or waterways.
Handling: Keep containers tightly closed. Handle with care in areas with good air flow. Use grounded equipment to dodge static sparks.
Storage: Store o-xylene in cool, dry places away from heat, open flames, and strong oxidizers. Plenty of signs warn folks about the presence of a flammable liquid. Use containers sealed to keep the vapor in and oxygen out.
Engineering Controls: Ventilation stays key—a fume hood or exhaust fan cuts down exposure.
Personal Gear: Splash goggles and gloves stay standard. Lab coats or chemical-resistant coveralls protect clothing and skin. For high vapor levels, a full-face respirator comes into play.
Exposure Limits: OSHA Permissible Exposure Limit is 100 ppm over an 8-hour workday. NIOSH and ACGIH echo this level in their recommendations.
Appearance: Clear, colorless liquid with a sweet odor
Boiling Point: About 144°C
Melting Point: -25°C
Solubility: Barely mixes with water, but dissolves well in organic solvents
Vapor Pressure: Around 6.6 mmHg at 20°C
Density: Just under 0.88 g/cm³
Flash Point: Around 32°C
Auto-Ignition Temperature: About 463°C.
Stability: O-xylene stays stable under usual conditions. Heating or mixing with strong oxidizers breaks that calm, though.
Reactivity: The chemical reacts with acids and halogens. Mixing with concentrated nitric acid or perchloric acid can spark dangerous conditions.
Hazardous Decomposition: Breaks down into carbon monoxide, carbon dioxide, and sometimes toxic smoke during burning.
Main Effects: Inhaling vapor clouds brings on headaches, nausea, confusion, and at high enough doses, blackout. Swallowing irritates the stomach and could depress breathing. Handling o-xylene often leads to dry, cracked skin. Eyes sting when vapor or liquid hits them. Repeated exposure links back to harm in the liver, kidneys, and nervous system.
Long-term Exposure: Animal studies tie ongoing exposure to liver size changes and fertility issues. People working with it every day might notice tiredness or memory problems.
Aquatic Effects: O-xylene doesn’t mix well with water but still poisons fish and water bugs if it leaks. Plants near contaminated soil lose growth and health. The chemical breaks down in soil after several days or weeks, though it spreads through air quickly.
Risk to Wildlife: Spills end up harming local animal populations, especially small aquatic creatures.
Methods: Industrial incineration sits as the main route for safe disposal. Burning must use equipment that captures and scrubs fumy byproducts. Never pour o-xylene down drains—local treatment plants don’t handle it well.
Regulations: Disposal routes depend on local rules, usually demanding labeling as hazardous waste.
Shipping: O-xylene ships as a flammable liquid. Bulk tanks or drums get placards warning of this danger.
Precautions: Containers keep tightly closed and upright. Drivers and carriers take fire safety rules seriously—spills or leaks must get reported and cleaned up fast. Only trained teams should handle large-scale transport.
Labeling: Containers in most regions carry hazard symbols for flammability and toxicity. The chemical makes it onto many regulated lists, including the Clean Air Act air toxics roster and EPA hazardous substances catalog.
Workplace Standards: Federal and state agencies require regular training for workers handling o-xylene, detailed safety paperwork, and plans to deal with accidental releases. Local air quality boards keep track of factories and sites using it in bulk.
