1,3,5-trimethylbenzene

1,3,5-trimethylbenzene is an aromatic hydrocarbon also known as mesitylene, with the molecular formula C9H12 and CAS number 108-67-8. It consists of a benzene ring with three methyl groups positioned symmetrically at the 1, 3, and 5 positions. This colorless liquid has a molecular weight of 120.19 g/mol and belongs to the family of methylated benzenes. It is classified as a flammable liquid with specific health and environmental hazards requiring proper handling precautions.

1,3,5-trimethylbenzene is a colorless liquid at room temperature with a characteristic aromatic odor. It has low solubility in water but is miscible with most organic solvents including alcohols, ethers, and hydrocarbons. The compound has a boiling point of approximately 165°C and a flash point around 50°C. Its density is lower than water at about 0.86 g/cm³. The substance exhibits typical aromatic stability while the methyl substituents influence its reactivity and physical properties.

1,3,5-trimethylbenzene serves primarily as a chemical intermediate in the synthesis of various industrial compounds. It is used in the production of trimesic acid, polymers, and specialty chemicals. The compound finds applications in the manufacture of high-performance materials, including heat-resistant plastics and engineering polymers. It also serves as a solvent in certain industrial processes and as a starting material for the synthesis of pharmaceuticals and agrochemicals in specialized chemical manufacturing operations.

1,3,5-trimethylbenzene requires careful handling due to its flammable nature and health hazards. Always wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Ensure adequate ventilation to prevent vapor accumulation and avoid inhalation. Keep away from ignition sources, heat, and sparks. Use non-sparking tools and equipment. Avoid skin and eye contact, and do not ingest. Work in well-ventilated areas or under fume hoods when handling significant quantities.

1,3,5-trimethylbenzene must be stored in a cool, dry, well-ventilated area away from heat sources and ignition points. Keep containers tightly sealed and store in appropriate chemical storage cabinets designed for flammable liquids. Maintain storage temperature below 25°C and protect from direct sunlight. Store separately from oxidizing agents and incompatible materials. Ensure proper grounding of containers during transfer operations. Use original containers or approved chemical storage vessels with proper labeling and safety information clearly visible.

Immediate action is required upon contact with 1,3,5-trimethylbenzene. For skin contact, remove contaminated clothing and wash affected area thoroughly with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for 15 minutes while holding eyelids open. If inhaled, move person to fresh air and seek medical attention if breathing difficulties occur. If ingested, do not induce vomiting and seek immediate medical attention. Always consult a physician when exposure occurs.

1,3,5-trimethylbenzene disposal must comply with local, national, and EU waste regulations as it is classified as hazardous waste. The substance cannot be disposed of in regular waste streams or sewerage systems due to its flammable properties and environmental impact classification. Contact licensed hazardous waste disposal companies for proper treatment, which typically involves high-temperature incineration or specialized chemical treatment. Maintain proper documentation of disposal activities and ensure containers are properly labeled before collection by authorized waste management services.

1,3,5-trimethylbenzene is classified under ADR Class 3 (flammable liquids), Packing Group III for transportation purposes. It requires appropriate hazardous goods packaging, labeling, and documentation during transport. Vehicles must comply with ADR regulations including proper placarding and emergency equipment. Drivers need valid dangerous goods training certificates. Packages must display proper hazard labels (GHS02, GHS07, GHS09) and shipping names. Transport should avoid extreme temperatures and ensure containers remain upright and secure during transit.

1,3,5-trimethylbenzene is subject to EU REACH regulation requiring registration for manufacture or import above specified tonnages. It falls under CLP regulation for classification, labeling, and packaging with assigned hazard classes including Flam. Liq. 3, STOT SE 3, and Aquatic Chronic 2. The substance is not currently listed as an SVHC (Substance of Very High Concern). Companies must maintain safety data sheets, implement risk management measures, and comply with occupational exposure limits where established by member states.

1,3,5-trimethylbenzene is available through OYSI, a specialized European chemical distributor offering high-quality industrial chemicals. OYSI provides reliable supply chains across Europe with proper regulatory compliance and technical support. As a professional chemical distributor, OYSI ensures products meet industry standards and provides complete documentation including safety data sheets, certificates of analysis, and regulatory compliance information. Contact OYSI directly for availability, technical specifications, packaging options, and delivery arrangements to your specific European location.