diisooctyl phthalate (diop or dioctyl isophthalate) is a synthetic phthalate ester widely used as a plasticizer to increase the flexibility, transparency, and durability of plastics, particularly in polyvinyl chloride (pvc) products. it is a colorless, oily liquid with low volatility and is primarily used in industrial and commercial applications.
chemical and physical properties
compound type: aromatic diester (phthalate)
molecular weight: 390.57 g/mol
chemical formula: C₂₄H₃₈O₄
boiling point: ~385°C
solubility: insoluble in water; soluble in most organic solvents
appearance: clear, oily liquid with mild odor
industrial uses and exposure
extensively used as a plasticizer in pvc-based materials such as cables, flooring, hoses, artificial leather, and coatings.
found in products like adhesives, paints, sealants, and rubber compounds.
used in medical devices, although being phased out in favor of safer alternatives due to potential toxicity concerns.
exposure occurs mainly through inhalation, ingestion, or dermal contact, especially in occupational settings.