M-xylene, also known as o-xylene, is a clear, colorless liquid with a distinctive aromatic odor. It is one of the three isomers of xylene and plays a crucial role in various industries due to its unique properties. M-xylene is highly flammable and has a flash point of 37°C (99°F). Its molecular formula is C8H10, and it boils at approximately 139°C (282°F) under standard atmospheric pressure. This compound is commonly used as a solvent in the production of polyester fibers, plastics, and resins. Additionally, M-xylene serves as a precursor for the synthesis of phthalic anhydride, which is essential for manufacturing polyvinyl chloride (PVC) and other thermoplastic materials. Due to its volatility and flammability, proper handling and storage procedures are necessary in industrial settings to ensure safety.