Antioxidant 1010 and Antioxidant 1076 are both sterically hindered phenolic primary antioxidants used to protect polymers against thermo-oxidative degradation, but they are not identical in formulation behavior. In practical terms, Antioxidant 1010 is usually preferred when very low volatility, high molecular weight, strong retention in the polymer, and long-term stabilization are priorities. Antioxidant 1076 is also an effective long-term primary antioxidant, but its lower molecular weight and much lower melting range can make it easier to incorporate in some polymer, elastomer, adhesive, coating, and resin systems. The better choice therefore depends on the polymer, processing temperature, required service life, compatibility, extraction conditions, and the rest of the stabilization package.
Quick Comparison: Antioxidant 1010 vs 1076
| Selection Factor | Antioxidant 1010 | Antioxidant 1076 |
| Primary function | Long-term primary phenolic antioxidant | Long-term primary phenolic antioxidant |
| Molecular weight | Approx. 1,178 g/mol | Approx. 531 g/mol |
| Melting range | Approx. 110–125°C | Approx. 50–55°C |
| Volatility tendency | Extremely low; excellent retention | Low; higher than 1010 but still designed for polymer stabilization |
| Typical advantage | High retention and durability in demanding polymer systems | Easy incorporation and good compatibility in many organic substrates |
| Common use areas | PE, PP, EVA, engineering polymers, ABS, elastomers, adhesives | PE, PP, styrenics, PU, elastomers, adhesives, coatings |
| Best choice when… | Long-term retention and minimum antioxidant loss are key | Formulation compatibility and lower melting behavior are important |
Neither product should automatically be described as “stronger” in every formulation. Antioxidant performance is system-dependent. A polymer compound that performs best with 1010 may not be optimized by replacing it one-for-one with 1076, and vice versa. Laboratory trials are the correct way to confirm dosage, processing stability, color retention, melt-flow behavior, and long-term aging performance.
Product Overview
The first point to understand in an Antioxidant 1010 vs 1076 comparison is that both products belong to the same broad functional family: primary phenolic antioxidants. Their role is to interrupt free-radical oxidation reactions that can damage polymers during processing and throughout service life. Thermal oxidation can cause chain scission, crosslinking, discoloration, loss of mechanical properties, odor formation, surface deterioration, and changes in melt flow. A suitable phenolic antioxidant helps slow these reactions and preserve the original properties of the material for longer.
What Is Antioxidant 1010?
Antioxidant 1010 is pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), CAS No. 6683-19-8. It is a high-molecular-weight, sterically hindered phenolic antioxidant widely used in plastics and other organic substrates. Its molecular weight is approximately 1,178 g/mol, and commercial grades are commonly supplied as white powder, granules, or pellets. The molecule contains multiple hindered phenolic groups, which contributes to its effectiveness as a durable primary antioxidant.
A major practical advantage of Antioxidant 1010 is its very low volatility. This matters in polymer production because stabilizers can be exposed to elevated temperatures during compounding, extrusion, pelletizing, molding, or repeated heat histories. A high-retention antioxidant is especially useful when the polymer must maintain stabilization not only during the first processing step but also through storage, conversion, recycling, or long-term end use.
Read more: What Are Polymer Antioxidants? A Complete Industrial Guide
What Is Antioxidant 1076?
Antioxidant 1076 is octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, CAS No. 2082-79-3. It is also a sterically hindered phenolic primary antioxidant, but its molecular structure is different from 1010. Its molecular weight is approximately 531 g/mol, and its melting range is around 50–55°C. It is commonly supplied as powder, fine granules, or dust-reduced pastilles depending on the grade.
Antioxidant 1076 combines good compatibility, low volatility, extraction resistance, color retention, and broad usefulness across polymers, elastomers, adhesives, coatings, and related organic substrates. Because it melts at a much lower temperature than 1010, formulators may find it convenient in systems where early melting, distribution, or incorporation of the antioxidant is desirable. This does not automatically make 1076 superior in processing; it simply gives it a different physical profile that can be advantageous in selected formulations.
Technical Comparison
The technical difference between Antioxidant 1010 and 1076 becomes clearer when molecular weight, physical form, volatility, melting behavior, compatibility, and stabilization objectives are considered together. These factors influence how the antioxidant behaves during compounding and how well it remains in the polymer during long-term use.
| Property | Antioxidant 1010 | Antioxidant 1076 | Why It Matters |
| Chemical type | Sterically hindered phenolic | Sterically hindered phenolic | Both are primary antioxidants that interrupt radical oxidation reactions. |
| CAS No. | 6683-19-8 | 2082-79-3 | Useful for procurement, SDS, COA, and regulatory identification. |
| Molecular weight | ~1,178 g/mol | ~531 g/mol | Higher molecular weight generally supports lower volatility and stronger retention. |
| Melting range | ~110–125°C | ~50–55°C | 1076 melts much earlier; 1010 remains solid to a higher temperature. |
| Volatility | Very low | Low | Lower volatility reduces stabilizer loss during heat exposure. |
| Compatibility | Good in many polymer matrices | Good in many polymers and organic substrates | Compatibility must still be checked for the actual formulation. |
| Synergy with phosphites | Yes | Yes | Both can be combined with secondary antioxidants such as phosphites for broader stabilization. |
Thermal Stability and Volatility
Antioxidant 1010 is often selected when formulators want a phenolic antioxidant with excellent retention under elevated processing or service temperatures. Its high molecular weight and extremely low vapor pressure make it attractive for demanding polymer applications where antioxidant migration or loss should be minimized. This can be particularly important in high-temperature compounding, multiple-pass processing, durable molded articles, engineering polymers, and applications requiring long-term heat aging.
Antioxidant 1076 is also designed for thermal stabilization and has low volatility, but its molecular weight is less than half that of 1010. The practical consequence is not that 1076 is unsuitable for heat; it is widely used for exactly that purpose. Rather, 1010 generally offers an advantage when the formulation places exceptional emphasis on low volatility and retention. The final result still depends on polymer polarity, antioxidant concentration, residence time, processing temperature, and exposure conditions.
Processing Performance
Both 1010 and 1076 can support processing stability, but a primary phenolic antioxidant should not be evaluated in isolation when severe processing oxidation is expected. During polymer processing, hydroperoxides are generated as part of the oxidation cycle. Secondary antioxidants such as phosphites are designed to decompose these hydroperoxides and can work synergistically with primary phenolic antioxidants. This is why combinations such as Antioxidant 1010 with Antioxidant 168 are common in polyolefin stabilization packages.
For processors, the important question is therefore not only “1010 or 1076?” but also “what complete antioxidant package matches the process?” A resin processed once at moderate temperature may need a different stabilizer balance from a recycled polymer exposed to multiple extrusion cycles, or from polypropylene used in an application requiring long-term heat aging. Melt-flow retention, yellowness index, oxidative induction time, mechanical-property retention, and odor can all be relevant evaluation criteria.
Read more: Primary vs Secondary Antioxidants: What’s the Difference?
Compatibility, Migration, and Extraction Resistance
Both antioxidants are known for good compatibility and resistance to extraction in many organic substrates. However, there is no universal compatibility ranking that applies to every polymer, plasticizer, adhesive, coating, or elastomer formulation. Antioxidant 1076 contains a long octadecyl chain and has a relatively low melting point, while 1010 is a much larger multifunctional molecule. These structural differences can influence solubility, diffusion, migration, and distribution in a specific matrix.
If a product will contact oils, detergents, water, solvents, or aggressive media, extraction resistance should be evaluated under conditions that represent actual service. Similarly, for films, fibers, thin-wall parts, food-contact materials, and sensitive color applications, migration behavior and applicable regulatory requirements should be reviewed using the exact commercial grade and intended use.
Applications
Antioxidant 1010 and 1076 overlap in many applications, particularly polyolefins, elastomers, adhesives, and styrenic materials. The key is to match the physical and stabilization profile to the polymer and the production process rather than selecting solely by product familiarity or price.
Polyethylene and Polypropylene
Both products are used in polyethylene and polypropylene. In polyolefins, a primary phenolic antioxidant protects against radical-driven thermo-oxidative degradation and is frequently paired with a phosphite secondary antioxidant for processing protection. Antioxidant 1010 is a strong default option when long-term thermal stability, low volatility, and retention are priorities. Antioxidant 1076 can also perform effectively and may be attractive when its lower melting behavior and compatibility fit the compounding system.
For PP and PE formulations, the final choice should consider whether the material will be used in film, fiber, injection molding, blow molding, pipe, sheet, rotomolding, or recycled compounds. Each route subjects the resin to a different heat history, shear level, surface-area-to-volume ratio, and service environment.
Engineering Plastics and ABS
Antioxidant 1010 is widely referenced for polymers beyond commodity polyolefins, including polyacetals, polyamides, polyurethanes, polyesters, PVC, styrene homo- and copolymers, and ABS. Its combination of broad compatibility and very low volatility makes it a practical candidate for polymer systems that experience high processing temperatures or require long-term retention. Antioxidant 1076 is also used in engineering plastics and styrenic systems, but formulators should compare stabilization efficiency and physical compatibility under the exact processing conditions.
Elastomers, Adhesives, and Tackifier Resins
Both antioxidants are relevant to elastomers and adhesives. Antioxidant 1076 is frequently considered in these applications because its chemical structure, low melting range, and compatibility profile can suit organic resin and elastomer systems. Antioxidant 1010 is also used in synthetic rubbers, SBS, SEBS, EPM, EPDM, butyl rubber, adhesives, and tackifier resins. For hot-melt adhesives, formulators should evaluate viscosity stability, color, odor, thermal aging, open time, substrate compatibility, and any interaction with other additives.
Coatings and Other Organic Substrates
Antioxidant 1076 has broad use in coatings and other organic substrates exposed to heat during processing, cure, baking, or service. Antioxidant 1010 is also used in coating and resin applications. In these systems, antioxidant selection may be influenced by solubility in the resin or solvent package, bake temperature, color sensitivity, film appearance, and compatibility with light stabilizers. For outdoor applications, a phenolic antioxidant does not replace a dedicated UV stabilization package; UV absorbers and HALS may be required depending on the coating or polymer system.
Check it: Why Antioxidants Are Essential in Plastic Manufacturing
Which One Is Better?
There is no single winner in the Antioxidant 1010 vs 1076 comparison. Antioxidant 1010 is generally the stronger choice when the formulation needs exceptionally low volatility, high molecular weight, strong retention, and durable long-term thermal stabilization. Antioxidant 1076 is an excellent alternative when good long-term phenolic stabilization is needed together with a lower melting range and a compatibility profile that suits the specific resin, elastomer, adhesive, or coating.
| Choose Antioxidant 1010 when… | Choose Antioxidant 1076 when… |
| • Very low volatility is a major requirement. | • A lower-melting primary antioxidant is advantageous for incorporation. |
| • The polymer experiences demanding heat histories. | • The formulation is based on polyolefins, elastomers, adhesives, tackifiers, or coatings where 1076 has proven compatibility. |
| • Long-term antioxidant retention is especially important. | • Color retention and broad organic-substrate compatibility are important. |
| • You need a broadly used option for PE, PP, EVA, ABS, engineering polymers, and elastomers. | • The process benefits from a primary antioxidant that melts and distributes earlier. |
| • The formulation will be paired with a phosphite such as 168 for a robust processing/long-term package. | • Trials show equal or better total formulation performance at the target dosage and cost. |
A one-for-one substitution based only on antioxidant percentage is not always appropriate. Because the molecules are different, the number of phenolic groups, molecular weight, solubility, diffusion, and formulation interactions are different. If a manufacturer is considering a switch for cost, availability, or sourcing reasons, the formulation should be revalidated rather than assuming identical performance.
How to Choose the Right Antioxidant Package
A reliable selection process starts with the polymer and the actual failure mode. If the main problem is degradation during extrusion, the formulation may need stronger processing stabilization. If the problem is embrittlement, color change, or property loss after months or years of heat exposure, long-term phenolic stabilization becomes more important. In many industrial compounds, the optimum solution is a balanced primary/secondary antioxidant package rather than a single additive.
- Define the polymer or resin system, including grade, melt flow, fillers, pigments, flame retardants, plasticizers, and other additives.
- Record the real processing profile: melt temperature, residence time, shear, oxygen exposure, drying conditions, and number of heat cycles.
- Define the end-use requirement: service temperature, expected lifetime, color requirement, contact media, outdoor exposure, and regulatory constraints.
- Select a starting antioxidant system. Use 1010 when retention and very low volatility are dominant priorities; evaluate 1076 when its lower melting behavior and compatibility may provide formulation benefits.
- Consider a secondary antioxidant such as a phosphite when processing oxidation is significant. Do not expect a primary phenol alone to provide the same hydroperoxide-decomposition function.
- Run laboratory and pilot trials across a reasonable dosage range instead of relying on a single inherited formulation.
- Measure relevant outcomes such as melt flow, color, oxidative induction time, viscosity, mechanical retention, odor, migration, and accelerated heat aging.
- Confirm the commercial grade, COA limits, packaging, storage, regulatory status, and supplier consistency before final approval.
Common Selection Mistakes
- Choosing only by price per kilogram. The lowest additive price does not necessarily produce the lowest stabilized compound cost if a higher dosage or additional stabilizer is required.
- Treating 1010 and 1076 as chemically identical substitutes. They share a functional class, but their molecular structures and physical properties differ.
- Ignoring the secondary antioxidant. Processing degradation in polyolefins often requires a phosphite or another co-stabilizer for optimum results.
- Using a generic dosage without trials. Antioxidant demand changes with polymer type, process severity, recycled content, pigments, fillers, and end-use requirements.
- Focusing only on initial color. A compound can look acceptable immediately after extrusion yet perform poorly after long-term heat aging.
- Ignoring additive interactions. HALS, UV absorbers, acid scavengers, lubricants, flame retardants, pigments, and catalyst residues can change stabilization behavior.
- Approving a product name without checking the commercial specification. Always review TDS, SDS, COA, regulatory declarations, storage conditions, and the exact grade supplied.
Frequently Asked Questions
Is Antioxidant 1010 better than Antioxidant 1076?
Not in every formulation. Antioxidant 1010 is generally favored for very low volatility and strong long-term retention, while Antioxidant 1076 can be advantageous where its lower melting range and compatibility profile are useful. The better product is the one that delivers the required processing and aging performance in the actual polymer system.
Can Antioxidant 1076 replace Antioxidant 1010 directly?
A direct one-for-one replacement should not be assumed. The two antioxidants differ in molecular weight, structure, melting range, volatility, and formulation behavior. A replacement should be validated with processing and long-term aging tests.
What is the main difference between Antioxidant 1010 and 1076?
The most practical differences are molecular structure, molecular weight, melting behavior, and volatility. Antioxidant 1010 has a much higher molecular weight and extremely low volatility, while Antioxidant 1076 has a lower molecular weight and a melting range around 50–55°C.
Can Antioxidant 1010 and 1076 be used with Antioxidant 168?
Yes. Both are primary phenolic antioxidants and can be combined with secondary antioxidants such as phosphites. Antioxidant 168 is commonly used as a processing stabilizer that decomposes hydroperoxides, while the phenolic antioxidant provides radical-trapping and longer-term protection.
Which antioxidant is commonly used in polypropylene?
Both 1010 and 1076 can be used in polypropylene. The selection depends on processing severity, long-term heat requirements, color, volatility, migration, other additives, and cost. Primary/secondary antioxidant blends are common in PP formulations.
Which antioxidant has lower volatility?
Antioxidant 1010 generally has the lower volatility because of its much higher molecular weight and extremely low vapor pressure. This is one reason it is widely selected for long-term retention in demanding polymer applications.
Does a higher melting point mean Antioxidant 1010 is more heat resistant?
Not by itself. Melting point and antioxidant performance are different concepts. The higher melting range of 1010 affects its physical behavior during incorporation, while long-term stabilization depends on chemistry, volatility, compatibility, concentration, process conditions, and the full additive package.
How should the dosage of Antioxidant 1010 or 1076 be selected?
Dosage should be established through laboratory or production trials. The required level depends on polymer type, process temperature, residence time, recycled content, service temperature, expected lifetime, other stabilizers, and regulatory requirements. Supplier starting ranges can guide trials but should not replace validation.
Conclusion
Antioxidant 1010 and Antioxidant 1076 are both proven primary phenolic antioxidants for protecting polymers and other organic substrates against thermo-oxidative degradation. Antioxidant 1010 stands out for its high molecular weight, extremely low volatility, and excellent retention, making it a strong option for demanding polymer processing and long-term thermal stabilization. Antioxidant 1076 offers effective phenolic protection with a significantly lower melting range and broad compatibility across polyolefins, elastomers, adhesives, coatings, and related formulations.
For most industrial users, the correct decision is application-specific rather than product-specific. Define the polymer, process, service conditions, and target properties; then evaluate 1010, 1076, and—where necessary—a secondary antioxidant such as 168 as part of a complete stabilization package. A controlled formulation trial is the most reliable way to determine which antioxidant delivers the best balance of processing stability, long-term performance, color, migration resistance, dosage, and total cost.
