Phthalic anhydride is a chemical compound commonly used in the production of plastics, resins, and dyes. It appears as a white crystalline solid and is primarily produced through the oxidation of naphthalene or o-xylene. This compound plays a crucial role in manufacturing various materials, including polyester and alkyd resins. In addition to its use in plastics, phthalic anhydride is also utilized in the production of certain types of pigments and as a chemical intermediate in the synthesis of other compounds. Its versatility makes it an important substance in the chemical industry, contributing to a wide range of products.