Dioctyl phthalate purified

Dioctyl phthalate purified is a high-purity grade of the plasticizer dioctyl phthalate (DOP), also known as bis(2-ethylhexyl) phthalate. It is typically supplied as a clear, colorless or slightly yellowish oily liquid with assay ≥99.5% and very low impurity/moisture content.​

Chemical properties

Chemical name: Dioctyl phthalate

Synonyms: Bis(2-ethylhexyl) phthalate, DEHP, DOP.​

CAS number: 117-81-7 (also 117-84-0 for di-n-octyl phthalate).​

Molecular formula: C₂₄H₃₈O₄.​

Molecular weight: ~390.54 g/mol.​

Appearance: Clear, colorless to light yellow oily liquid.​

Density: 0.985–0.988 g/mL at 20–25 °C.​

Boiling point: 384 °C.​

Melting point: −50 °C.​

Refractive index: 1.483–1.488 at 20–27 °C.​

Acid value: ≤0.01% as phthalic acid.​

Moisture content: ≤0.1%.​

Applications

Used as a primary plasticizer in the manufacture of flexible PVC products, resins, elastomers, and rubber.​

Often selected for high-purity/plasticizer-sensitive applications including laboratory, medical device, and analytical reagent use where low UV absorbance and minimal impurities are necessary.​

Purification notes

Highly purified DOP may be further processed to reduce levels of phthalide and UV-absorbing impurities, meeting ISO standards for medical applications.​

Typical methods involve filtration or adsorption (activated carbon, silica gel, diatomaceous earth) to remove color bodies and phthalide by-products, resulting in DOP with UV absorbance <0.1 at 230 nm.​

Safety and handling

Store in tightly closed containers at room temperature, away from heat and strong oxidizers.​

Handle with appropriate PPE due to potential health and environmental risks; not for food, drug or cosmetic use.​