– Diheptyl phthalate belongs to the class of phthalate esters and consists of two heptyl (C7) chains attached to the main phthalate backbone. This compound is commonly used as a plasticizer in various polymer materials, such as PVC, to enhance flexibility and durability. It also serves as a lubricant, solvent, or additive in diverse industrial applications, including coatings, adhesives, and sealants. However, Diheptyl phthalate is identified as an environmental pollutant and health hazard due to its potential endocrine disruption and toxicity.