Dioctyl Phthalate (DOP)

Dioctyl Phthalate (DOP), also known as Di(2-ethylhexyl) phthalate (DEHP) or Bis(2-ethylhexyl) phthalate, is a widely used, cost-effective general-purpose plasticizer for polyvinyl chloride (PVC) and other polymers. With CAS Number 117-81-7 and molecular formula C₂₄H₃₈O₄, DOP provides excellent flexibility, durability, and processing characteristics to flexible vinyl products while maintaining low cost and broad compatibility.

Appearance:
transparent oily liquid
CAS No.:
117-84-0
Molecular Formula:
C24H38O4
Molecular Weight:
390.56
EINECS:
204-214-7
Solubility:
Insoluble in water

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Product Description

Product Description

DOP is a colorless, odorless (or very mild odor), oily liquid with low volatility, superior heat and UV stability, and excellent resistance to hydrolysis. It remains one of the most common plasticizers in non-restricted industrial applications, offering balanced performance for flexible PVC formulations.

Technical Specifications

ITEMS	SPECIFICATIONS
Appearance	Transparent oily liquid
Content	≥99.5%
Chroma(Pt-Co)	≤30
Density (20℃), g/cm³	0.982-0.988
Acidity (calculated as benzoic acid)	≤0.01%
Moisture	≤0.1%
Flash point	≥196°C
Volume resistivity ×10⁹Ω·m	≥1.0

Packaging and Storage

Net weight 200kgs steel drum, 16MT/FCL with pallets
Store in cool place. Keep container tightly closed in a dry and well-ventilated place.

Primary Uses and Applications of Dioctyl Phthalate (DOP)

DOP is primarily used as a plasticizer to impart flexibility and softness to rigid polymers, especially PVC. Key applications include:

Flexible PVC products:

Wire and cable insulation, medical tubing (non-restricted uses), flooring, vinyl sheets, artificial leather, tarpaulins, garden hoses, conveyor belts, and weather stripping

Construction materials:

Roofing membranes, swimming pool liners, carpet backing, floor tiles

Automotive and industrial:

Sealants, gaskets, adhesives, coatings

Other:

Dielectric fluids in capacitors, hydraulic fluids, nitrocellulose lacquers, and as a solvent/carrier in some formulations

DOP offers excellent plasticizing efficiency, low migration, good electrical properties, and compatibility with a wide range of resins.

Frequently Asked Questions (FAQs)

Q: What is DOP used for?

A: DOP is a general-purpose plasticizer mainly for making PVC flexible in products like cables, flooring, hoses, and industrial coatings.

Q: What is the difference between DOP and DEHP?

A: DOP and DEHP refer to the same compound: Di(2-ethylhexyl) phthalate. The names are used interchangeably.

Q: Is DOP safe?

A: DOP has low acute toxicity but is suspected of reproductive/developmental effects with prolonged exposure. It is restricted in children's products and some medical/food applications in many countries.

Q: Why is DOP still used despite regulations?

A: It provides excellent cost-performance balance, heat/UV stability, and compatibility in non-sensitive industrial applications where alternatives may be more expensive.

Q: What are phthalate-free alternatives to DOP?

A: Common alternatives include DOTP, ATBC, DINCH, and adipates, which offer similar performance with improved regulatory profiles.