Di-Octhyl Phathalate (DOP)
Dioctyl Phthalate (DOP) is a plasticizer used in the production of flexible polyvinyl chloride (PVC) plastic.
Dioctyl Phthalate is one of the most widely used plasticizers in PVC due to its low cost. DOP is a general-purpose plasticizer and long-time industry standard known for its good stability to heat and ultraviolet light, and broad range of compatibility for use with PVC resins. Dioctyl Phthalate can also be used as dielectric and hydraulic fluids.
CAS Number: 117-81-7
Chemical Name: Bis(2-ethylhexyl) phthalate
Common Names: DOP (Di-Octyl Phthalate)
Chemical Formula: C₂₄H₃₈O₄
Molecular Weight: 390.56 g/mol
Appearance: Clear, colorless to light yellow oily liquid
Odor: Mild, characteristic odor
Solubility: Insoluble in water; soluble in alcohol, ether, benzene, and other organic solvents
Boiling Point: ~384 °C
Density: ~0.985 g/cm³ at 25 °C
Flash Point: ~210 °C (closed cup)
Viscosity: ~70–85 cP at 25 °C
Application in areas:
- Primary Plasticizer for PVC:
Most common use is in flexible PVC products, including:- Cables and wires
- Flooring, wall coverings
- Synthetic leather
- Tubing, hoses, and seals
- Plastic films and sheets
- Rubber and Polymers
- Used in nitrile rubber, chloroprene rubber, and other elastomers to improve flexibility and durability.
- Paints and Coatings
- Used to modify viscosity and enhance film-forming properties.
- Adhesives and Sealants
- Improves flexibility and tackiness in formulations
Safety & Handling:
- Hazards:
- Suspected to be reprotoxic (may harm fertility or unborn children)
- Can cause environmental harm (persistent in soil and water)
- Skin contact may cause irritation with prolonged exposure
Regulatory Restrictions:
- Banned or restricted in toys and childcare articles in many countries (e.g., EU REACH, U.S. CPSIA)
- Frequently being replaced by non-phthalate alternatives like DINCH, DOA, or DOTP
PPE Requirements:
- Use gloves, safety goggles, and proper ventilation when handling
Storage Guidelines:
- Store in tightly closed containers away from heat, sparks, and direct sunlight
Packaging: Drum