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中文简体Walk through any plant that extrudes flexible PVC and you will find a small group of additives doing the heavy lifting. Plasticizers sit at the top of that list. Among them, dioctyl adipate plasticizer, usually shortened to DOA, has built a steady reputation for one job in particular: keeping polymers soft and workable when the temperature drops.
If you have ever watched a garden hose crack in winter or a cable jacket stiffen in a cold warehouse, you already understand why adipate esters matter. This guide covers what DOA is, how it performs, where it fits best, and what to check before you place an order.
Content
What Is Dioctyl Adipate Plasticizer?
Dioctyl adipate is the diester formed from adipic acid and 2-ethylhexanol. In technical literature you will also see it written as bis(2-ethylhexyl) adipate, DEHA, or di-2-ethylhexyl adipate. Its CAS number is 103-23-1.
Chemically, DOA belongs to the aliphatic adipate family, which sets it apart from the aromatic phthalate esters that dominate general-purpose plasticizing. That difference is not a technicality. Aliphatic esters interact less strongly with PVC chains, so less energy is needed to keep those chains moving when the material turns cold.
At room temperature DOA is a clear, nearly colorless, oily liquid with a mild odor. It is practically insoluble in water but freely soluble in common organic solvents, which makes it easy to handle in standard blending and dosing equipment.
| Property | Typical value |
|---|---|
| Appearance | Clear, colorless to pale yellow oily liquid |
| Chemical name | Bis(2-ethylhexyl) adipate |
| CAS number | 103-23-1 |
| Molecular formula | C22H42O4 |
| Molecular weight | 370.6 g/mol |
| Density at 20 °C | 0.921 to 0.927 g/cm3 |
| Flash point | 190 to 210 °C |
| Viscosity at 20 °C | 13 to 15 mPa·s |
| Acid value | 0.1 mg KOH/g maximum |
| Pour point | Below -60 °C |
Dioctyl AdipateProperties and Specifications :View Product →Why DOA Excels in Low-Temperature Applications
Every plasticizer is a trade-off between flexibility, permanence, cost, and processing behavior. DOA makes its trade in one direction: cold flexibility. Because of its low viscosity and relatively weak polymer interaction, it lowers the temperature at which a compound becomes stiff and brittle far more effectively than most general-purpose phthalates.
In practice, formulators reach for DOA whenever a finished part has to survive a cold chain, a winter installation, or a freezer aisle. Common examples include:
- Freezer-grade films and packaging where cold cracking is unacceptable
- Cold-storage conveyor belts, hoses, and gaskets
- Outdoor cable jackets, geomembranes, and roofing sheet
- Automotive interior skins, seals, and under-hood tubing
- Coated fabrics and tarpaulins used in cold climates
DOA is not only a PVC additive, either. It also serves as a softening and lubricating agent in nitrocellulose lacquers, adhesives, printing inks, rubber compounds, and some cellulose-based systems.
How DOA Compares with Other Plasticizers
Choosing a plasticizer is rarely a matter of finding one universal best product. It is a matter of matching chemistry to the performance the end product must deliver. The table below places DOA beside the esters most often specified in the same formulations.
| Plasticizer | Family | Low-temperature performance | Permanence | Typical role |
|---|---|---|---|---|
| DOA | Aliphatic adipate | Excellent | Moderate | Cold flexibility, often blended |
| DOP | Aromatic phthalate | Moderate | Good | General-purpose benchmark |
| DINP | Aromatic phthalate | Moderate | Very good | Durable general purpose |
| DOTP | Terephthalate | Moderate | Very good | Non-ortho-phthalate alternative |
The takeaway is simple. DOA is seldom the whole answer, but it is often the difference between a compound that survives a cold snap and one that fails. A familiar approach is to replace part of a higher-molecular-weight general-purpose plasticizer with DOA, gaining low-temperature performance while limiting the effect on volatility and extraction resistance.
How much DOA to use depends on the target brittle point, the permanence requirements, and the processing method. Blends where DOA makes up 20 to 40 percent of the total plasticizer content are a common starting point, and the final figure should always be confirmed by testing the finished compound.
Dioctyl PhthalateProperties and Specifications:View Product →Typical Applications and Formulation Guidance
Because DOA works well alone and in blends, it appears across a wide spread of industries. The most common applications include:
- Flexible PVC films and sheeting for cold environments
- Wire and cable insulation and jacketing
- Hoses, tubing, and extruded profiles
- Coated textiles and synthetic leather
- Adhesives, sealants, and caulks
- Rubber goods, inks, and lacquers
Loading levels depend on how much flexibility the formulation needs. In flexible PVC, DOA typically appears as part of a total plasticizer system of 20 to 60 parts per hundred resin, while plastisols may run higher. Because adipate esters are somewhat more volatile than high-molecular-weight phthalates, it is worth checking oven aging and volatility loss in any application that sees sustained heat.
Handling, Storage, and Compliance Notes
DOA is an established industrial ester with a well-documented handling profile. Store it in closed, clean steel or HDPE containers away from direct sunlight, moisture, and strong oxidizing agents. Bulk storage should be kept at moderate temperatures, and drummed product is best used on a first-in, first-out basis.
Regulatory treatment varies by market and by end use. DOA is registered under the major chemical frameworks and is not classified as a carcinogen, but direct food-contact and medical applications are governed by specific national approvals. Confirming the current local requirements for your intended use is always the right first step, and a reliable supplier will provide the certificate of analysis, safety data sheet, and supporting documentation for every batch.
Blending DOA for Balanced Performance
Where a formulation has to avoid ortho-phthalates altogether, the natural partner for DOA is a terephthalate or trimellitate. A system built around DOTP delivers strong permanence and heat resistance, and adding DOA sharpens the low-temperature behavior that DOTP alone cannot match. Together the two cover a much wider service window than either product manages on its own.
Dioctyl TerephthalateProperties and Specifications:View Product →Why Sourcing DOA From Us Makes Sense
Zhejiang Great Chemical Science & Technology Co., Ltd. has been manufacturing plasticizers since 2008, and DOA has been part of our range for most of that time. Our plant sits on the south side of Provincial Road 01 at the northern end of the Qiantang River bridge, about three kilometers from Jiaxing Port, with direct access to the Hangpu, Zhajiasu, and Shanghai-Hangzhou expressways. Raw materials arrive and finished product leaves by both road and water.
Our team of more than 180 people produces a family of plasticizers and fine chemicals that includes DOP, DOTP, DINP, DOA, TOTM, and phthalic anhydride. Our stated capacity covers 150,000 tonnes of plasticizers and 50,000 tonnes of phthalic anhydride per year. Products are manufactured to national high-grade standards, and our environmentally friendly grades are made to meet European requirements.
Technical questions about DOA rarely arrive at a convenient moment, so we keep the answers close at hand. For a closer look at how DOA performs against other esters, our article on how dioctyl adipate compares with other plasticizers works through the numbers. To see the wider range we produce, start at our company homepage.
Dioctyl adipate is one of those products that rarely dominates a formulation on paper, yet frequently decides whether it performs in the field. Specified thoughtfully, it delivers cold-weather flexibility that few general-purpose plasticizers can match, and it blends easily with almost anything already in your system.
If you are weighing DOA for an upcoming project, our technical team is happy to discuss loading levels, blend options, and documentation. Send us your target properties and we will help you find the grade and combination that fits.
