m-Xylene, identified by its CAS number 108-38-3, is an aromatic hydrocarbon that holds significant importance in the chemical industry. As one of the three isomers of dimethylbenzene, its molecular structure, featuring methyl groups at the 1 and 3 positions of the benzene ring, dictates its unique chemical behavior and physical properties. These attributes make it a highly sought-after compound for various industrial processes and laboratory applications.

The chemical and physical characteristics of m-Xylene are fundamental to its utility. It exists as a colorless liquid with a distinct aromatic odor. With a melting point of -48°C and a boiling point of 139°C, it remains liquid under most ambient conditions, facilitating its handling and use. Its density is approximately 0.868 g/mL at 25°C. Crucially, m-Xylene is miscible with most organic solvents but exhibits very low solubility in water. This property makes it an effective solvent for a range of non-polar substances, which is vital for its applications in areas like histology and industrial cleaning.

The industrial significance of m-Xylene is most prominently seen in its role as a precursor for isophthalic acid. This vital chemical intermediate is extensively used in the production of polyester resins and polymers, including modifications to polyethylene terephthalate (PET). Isophthalic acid imparts enhanced thermal stability, chemical resistance, and mechanical strength to these materials, making them suitable for demanding applications in sectors ranging from automotive to construction. Companies seeking to buy m-Xylene for these purposes often look for high-purity grades to ensure optimal reaction yields and product quality.

In addition to its role in synthesis, m-Xylene is widely employed as an industrial solvent. Its solvency power is leveraged in the printing, rubber, and leather industries for various formulations and processes. In research laboratories, it serves as a standard solvent for chromatographic techniques and is particularly noted for its use in histology as a clearing agent for tissue samples. The availability of m-Xylene from China at competitive prices makes it an accessible resource for global manufacturers and researchers. When sourcing, it is crucial to partner with a reliable manufacturer that guarantees product consistency.

Safety is a critical aspect of working with m-Xylene. It is classified as a flammable liquid and vapor, requiring appropriate storage and handling precautions to prevent fire hazards. Exposure can cause irritation to the skin, eyes, and respiratory system, and prolonged exposure may affect the central nervous system. Consulting the Material Safety Data Sheet (MSDS) for m-Xylene is essential for understanding and implementing safe handling practices. Prioritizing safety ensures the well-being of personnel and the integrity of operations.

In essence, m-Xylene is a chemical compound of considerable versatility and importance. Its contributions to polymer science through isophthalic acid synthesis and its functional role as a robust solvent underscore its value across multiple industries. The consistent demand for this chemical highlights the need for reliable sourcing and adherence to best practices in its handling and application.