What is Dioctyl Phthalate DOP CAS 117-81-7?

Dioctyl Phthalate DOP, also called DEHP or bis(2-ethylhexyl) phthalate, CAS 117-81-7, is a general-purpose phthalate plasticizer with the molecular formula C24H38O4. It is a colorless to pale-yellow oily liquid used to make PVC and other polymers softer and easier to process.

What is the main function of DOP in PVC processing?

DOP separates and lubricates PVC polymer chains, increasing free volume and allowing the chains to move more easily. This turns rigid PVC into a flexible material with better elongation, low-temperature performance and processability for cables, films, sheets, flooring and synthetic leather.

What are the main industrial applications of DOP?

DOP is widely used as a plasticizer in PVC cables, wires, films, sheets, flooring and synthetic leather. It also appears in rubber processing, adhesives, sealants, coatings and other industrial compounds where flexibility and durability are required.

What is the difference between DOP and DOTP?

DOP is a phthalate-based plasticizer, while DOTP is a terephthalate-based non-phthalate alternative. DOP is cost-effective and has long been a standard plasticizer, but it faces restrictions in toys, childcare articles, food-contact and medical uses in some regions; DOTP is chosen when a non-phthalate option is required.

What are typical specifications for industrial DOP?

Industrial DOP is typically a clear oily liquid with density around 0.982-0.986 g/cm3 at 20 C, refractive index about 1.483-1.488, molecular weight about 390.56, low acid value and water content, and open-cup flash point generally at least 210 C. Exact limits vary by grade, so the supplier COA controls the batch.

Dioctyl Phthalate DOP CAS 117-81-7

Dioctyl Phthalate (CAS 117-81-7), universally abbreviated as DOP or chemically known as Di(2-ethylhexyl) phthalate (DEHP), is the most widely used general-purpose plasticizer in the global polymer industry. Chemically identified as the diester of phthalic acid and 2-ethylhexanol, this clear, colorless, and viscous oily liquid functions to impart flexibility, softness, and processability to rigid polyvinyl chloride (PVC) resins. Phthalic Anhydride is a related upstream aromatic intermediate in phthalate-ester production. Considered the industry standard for cost-performance balance, it is extensively integrated into the manufacturing of soft PVC products, including wire and cable insulation, artificial leather, flexible hoses, footwear soles, and waterproof membranes. Its excellent compatibility with PVC, low volatility, and good electrical insulating properties make it the primary choice for industrial soft plastic applications where phthalate restrictions do not apply. Where a terephthalate plasticizer is specified, Dioctyl Terephthalate (DOTP) is a separate product to evaluate against the applicable regulatory and performance requirements. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific color (APHA) and purity standards (typically >99.5% Industrial Grade). Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

CAS: 117-81-7
Synonyms: DOP, DEHP, Di(2-ethylhexyl) phthalate, Bis(2-ethylhexyl) phthalate, Di-sec-octyl phthalate
Einecs: 204-211-0
Molecular Formula: C₂₄H₃₈O₄
Grade: Industrial Grade (Plasticizer)
Package: 200 kg iron drum / 1000 kg IBC (customizable)

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Product Description

DOP is a colorless to pale-yellow oily liquid with low volatility and good thermal stability. It provides excellent plasticizing efficiency, improving flexibility, elongation, and low-temperature performance of polymer materials. Due to its balanced properties and cost efficiency, it has long been used as a standard plasticizer in industrial formulations.

1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

Typical values based on common Chinese factory COA. Final specifications subject to batch analysis.

Item	Typical Value
Appearance	Colorless to pale-yellow transparent oily liquid
CAS No.	117-81-7
EC No.	204-211-0
Molecular formula	C₂₄H₃₈O₄
Molecular weight	390.56 g/mol
Density (20°C)	0.982–0.986 g/cm³
Refractive index (20°C)	1.484–1.488
Flash point (open cup)	≥ 210 °C
Boiling point	~ 385 °C
Pour point	≤ −50 °C
Water content	≤ 0.10%
Acid value	≤ 0.05 mg KOH/g
Water solubility	Insoluble

Applications

PVC plasticizer for cables, wires, films, sheets, flooring, and synthetic leather
Rubber processing to improve flexibility and processing behavior
Adhesives and sealants as a plasticizing component
Coatings and industrial compounds requiring flexibility and durability

Note: Due to regulatory restrictions, DOP is mainly used in industrial applications. User compliance verification is recommended.

For alternative plasticizer options, see Dioctyl Terephthalate (DOTP) and Diisodecyl Phthalate (DIDP).

Storage Conditions

Store in sealed containers in a cool, dry, and well-ventilated area
Avoid direct sunlight, moisture, and strong oxidizing agents
Recommended storage temperature: ambient
Shelf life: 12–24 months under proper storage conditions

Safety Precautions

Avoid prolonged skin contact and eye exposure; wear protective gloves and safety goggles
Ensure adequate ventilation during heated processing
Spilled material may cause slipping—clean immediately
Regulatory note: Classified as SVHC under EU REACH; restricted in toys, childcare articles, and certain consumer products
SDS available upon request

FAQ - Technical & Supply Chain

Q:
What is Dioctyl Phthalate DOP CAS 117-81-7?

A: Dioctyl Phthalate DOP, also called DEHP or bis(2-ethylhexyl) phthalate, CAS 117-81-7, is a general-purpose phthalate plasticizer with the molecular formula C24H38O4. It is a colorless to pale-yellow oily liquid used to make PVC and other polymers softer and easier to process.
Q:
What is the main function of DOP in PVC processing?

A: DOP separates and lubricates PVC polymer chains, increasing free volume and allowing the chains to move more easily. This turns rigid PVC into a flexible material with better elongation, low-temperature performance and processability for cables, films, sheets, flooring and synthetic leather.
Q:
What are the main industrial applications of DOP?

A: DOP is widely used as a plasticizer in PVC cables, wires, films, sheets, flooring and synthetic leather. It also appears in rubber processing, adhesives, sealants, coatings and other industrial compounds where flexibility and durability are required.
Q:
What is the difference between DOP and DOTP?

A: DOP is a phthalate-based plasticizer, while DOTP is a terephthalate-based non-phthalate alternative. DOP is cost-effective and has long been a standard plasticizer, but it faces restrictions in toys, childcare articles, food-contact and medical uses in some regions; DOTP is chosen when a non-phthalate option is required.
Q:
What are typical specifications for industrial DOP?

A: Industrial DOP is typically a clear oily liquid with density around 0.982-0.986 g/cm3 at 20 C, refractive index about 1.483-1.488, molecular weight about 390.56, low acid value and water content, and open-cup flash point generally at least 210 C. Exact limits vary by grade, so the supplier COA controls the batch.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

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Send the CAS number, grade, quantity, packing preference and destination.

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Storage & Shipping

Product-specific conditions are confirmed before order.

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