Antioxidant 3114 is a sterically hindered phenolic primary antioxidant used to protect polymers and other organic materials from thermo-oxidative degradation during processing and long-term service. Its combination of low volatility, high resistance to extraction, good substrate compatibility, and non-discoloring performance makes it a practical choice for demanding polymer stabilization programs. It is used in polyolefins and can also be applied in styrenics, linear polyesters, PVC, polyamides, polyurethanes, elastomers, adhesives, tackifier resins, and other organic substrates. For formulators dealing with elevated processing temperatures, repeated heat histories, or long-term thermal exposure, Antioxidant 3114 is best considered as one component of an application-specific stabilization package rather than as a universal one-additive solution.
Quick Technical Summary
| Property | Practical summary |
| Additive type | Sterically hindered phenolic primary antioxidant |
| Chemical identity | 1,3,5-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6-trione; CAS 27676-62-6 |
| Molecular weight | Approximately 784 g/mol |
| Commercial form | White free-flowing powder or free-flowing granules, depending on supplier and grade |
| Key strengths | Thermo-oxidative protection, low volatility, extraction resistance, compatibility, color stability |
| Common polymer families | PE, PP, polybutene, styrenics, polyesters, PVC, polyamides, polyurethanes, elastomers |
| Typical polyolefin use level | About 0.05–0.3% according to BASF technical guidance; optimum dosage is application-specific |
| Common synergistic partner | Phosphite processing stabilizers such as Antioxidant 168 |
What Is Antioxidant 3114?
Antioxidant 3114 belongs to the hindered phenol family of primary antioxidants. Primary antioxidants are commonly described as chain-breaking stabilizers because they interrupt the free-radical oxidation cycle that develops when a polymer is exposed to heat, oxygen, shear, catalyst residues, or repeated processing. In practical terms, the additive helps slow the chemical reactions that can lead to molecular-weight change, embrittlement, discoloration, loss of mechanical performance, odor development, and reduced service life.
The chemical is identified by CAS No. 27676-62-6 and has a molecular weight of approximately 784 g/mol. BASF lists a melting range of about 218–223 °C for its Irganox® 3114 grade and supplies it as a white free-flowing powder or as free-flowing granules. SONGWON likewise classifies SONGNOX® 3114 as a phenolic primary antioxidant and offers powder and free-flowing forms. These physical characteristics matter because additive handling, feeding consistency, dispersion, dust generation, and the processing profile can influence the choice of commercial form.
How a Hindered Phenolic Antioxidant Works
Polymer oxidation generally proceeds through radical chain reactions. Once polymer radicals and peroxy radicals are generated, the degradation cycle can continue and accelerate under heat. Hindered phenolic antioxidants can donate hydrogen to reactive peroxy radicals, converting them into less reactive species and interrupting the propagation stage. This is why Antioxidant 3114 is described as a primary antioxidant rather than a hydroperoxide decomposer.
The distinction between Primary and secondary antioxidants is essential when designing a stabilizer package. A primary hindered phenol mainly targets radical propagation, while a secondary antioxidant such as a phosphite is intended to react with hydroperoxides formed during oxidation and processing. The two mechanisms can complement one another. BASF specifically notes the effectiveness of blends of Irganox® 3114 with Irgafos® 168, which is why Antioxidant 168 is often evaluated alongside a phenolic primary antioxidant when processing stability is important.
Why the Molecular Structure Matters
The bulky, sterically hindered phenolic groups in Antioxidant 3114 are designed to provide antioxidant activity while limiting undesirable side reactions. Its triazine-based core and relatively high molecular weight contribute to a low-volatility profile. In many polymer applications, low volatility is important because a stabilizer that is lost during compounding, extrusion, molding, drying, or long-term heat exposure cannot continue protecting the polymer effectively. High resistance to extraction is also valuable where the finished material may contact liquids, oils, detergents, or other media that could gradually remove mobile additives.
Technical Benefits
The practical value of Antioxidant 3114 comes from the balance of thermal protection, physical retention, compatibility, and color performance. The final benefit in a specific formulation depends on polymer type, process temperature, residence time, oxygen exposure, additive interactions, pigment system, fillers, and the required service life. For that reason, the additive should be evaluated as part of the complete formulation rather than selected only from a single data point such as melting range.
1. Protection Against Thermo-Oxidative Degradation
Its central function is to reduce oxidative damage caused by heat and oxygen. This is relevant both during polymer processing and during the useful life of the finished article. In a well-designed formulation, improved oxidative stability can help preserve mechanical properties, appearance, and processing consistency. This is particularly important for materials that may experience several heat histories, such as compounded polymers that are pelletized, molded, reprocessed, or mechanically recycled.
2. Low Volatility for Demanding Processing Conditions
Low volatility is a significant advantage when polymers are processed at elevated temperatures or held in hot equipment for meaningful residence times. Antioxidant 3114 is specifically characterized by BASF as a low-volatility stabilizer. This does not mean it is automatically the best choice for every high-temperature process, but it makes it a relevant candidate where additive retention during compounding and fabrication is a priority. Process trials should confirm retention, color, melt-flow behavior, odor, plate-out, and final physical properties.
3. High Resistance to Extraction
Extraction resistance helps the stabilizer remain in the polymer when the finished product encounters liquids or other contact media. This can be valuable in durable articles, technical parts, elastomeric systems, adhesives, and applications where long-term additive retention matters. Extraction resistance must still be judged in the context of the actual polymer, contact medium, temperature, and regulatory requirements of the end use.
4. Color and Appearance Stability
BASF describes Irganox® 3114 as a non-discoloring stabilizer that is stable to light. For manufacturers of natural, white, pastel, translucent, or color-sensitive compounds, this can be a meaningful formulation advantage. Antioxidant selection is only one part of color control, however. Resin quality, processing history, pigments, catalyst residues, UV exposure, other additives, and contamination can all influence final color.
5. Compatibility With Synergistic Stabilizer Systems
Antioxidant 3114 can be used with costabilizers such as phosphites, phosphonites, thioethers, light stabilizers, and other functional additives. A common concept is to combine a primary phenolic antioxidant with a secondary processing stabilizer. Antioxidant 168 is a phosphite secondary antioxidant that reacts with hydroperoxides during processing and can extend the useful performance of the primary antioxidant. This complementary chemistry can improve process stability compared with relying on one mechanism alone.
Combined antioxidants can also simplify formulation and dosing when a fixed primary/secondary ratio matches the process requirement. Commercial systems such as Antioxidant B-215 and Antioxidant B225 are examples of premixed approaches used in polymer stabilization markets. They should not be treated as direct substitutes for Antioxidant 3114 without checking chemistry, ratios, polymer compatibility, processing conditions, required long-term stability, and regulatory status.
Applications
The application range for Antioxidant 3114 is broad. Manufacturer technical literature lists polyolefins, styrenic polymers, linear polyesters, PVC, polyamides, polyurethanes, elastomers, adhesives, tackifier resins, and other organic substrates. The most suitable dosage and supporting stabilizers vary significantly by polymer family and final use.
Polyolefins: Polyethylene and Polypropylene
Polyethylene and polypropylene are among the most important application areas for phenolic antioxidants. During extrusion, pelletizing, film production, injection molding, blow molding, fiber spinning, and recycling, polyolefins can experience thermo-oxidative stress that changes molecular weight and performance. Antioxidant 3114 can provide primary antioxidant protection in these systems. BASF indicates typical polyolefin concentration levels of approximately 0.05–0.3%, depending on the substrate, processing conditions, and long-term thermal-stability requirements.
That range is a technical starting point, not a universal recipe. A thin film, high-MFI polypropylene fiber, thick injection-molded part, recycled HDPE compound, and filled PP automotive formulation can require very different stabilization strategies. Laboratory screening should evaluate melt-flow retention, color, oven aging, mechanical properties, odor, migration, and any application-specific compliance requirements.
Engineering Plastics and Higher-Temperature Processing
Engineering polymer systems often place greater demands on additives because processing temperatures, residence times, shear, and service temperatures can be higher than in many commodity applications. BASF includes polyamides, polyurethanes, linear polyesters, PVC, and styrenic polymers within the application range for Irganox® 3114. In these systems, the low-volatility and extraction-resistant character of Antioxidant 3114 can be attractive when formulators need a primary antioxidant that remains effective through demanding processing and service conditions.
However, “high-temperature stabilizer” should not be interpreted as unlimited temperature resistance. The polymer itself, the antioxidant’s thermal history, residence time, oxygen level, moisture, metals, catalysts, flame retardants, fillers, and co-additives all affect performance. The safest formulation practice is to define the degradation problem first and then validate the complete additive package under realistic processing conditions.
Elastomers, Adhesives, and Tackifier Resins
BASF also identifies SBS, EPR, EPDM, other synthetic rubbers, adhesives, and natural or synthetic tackifier resins as suitable substrate groups. In these materials, oxidation may appear as viscosity drift, hardening, loss of elasticity, color development, odor, reduced adhesion, or changes in aging performance. The low-volatility and extraction-resistant profile of Antioxidant 3114 can be useful where the stabilizer must remain in the formulation during processing and service.
Other Organic Substrates
Manufacturer literature also refers to synthetic fibers, waxes, oils, fats, and other organic substrates. The formulation logic remains the same: determine the oxidation pathway, processing exposure, storage conditions, and end-use requirements before selecting the antioxidant level and any synergistic partners.
Comparison
A useful comparison starts by separating antioxidant function from product name. Antioxidant 3114, Antioxidant 1010, and Antioxidant 1076 are all hindered phenolic primary antioxidants, while Antioxidant 168 is a phosphite secondary antioxidant. The first three are not identical, and Antioxidant 168 is not a like-for-like replacement because it addresses a different stage of the oxidation process.
| Product | Antioxidant type | Main technical role | When it may be considered |
| Antioxidant 3114 | Primary, hindered phenol | Long-term thermo-oxidative protection; low volatility; extraction resistance | Demanding polymer stabilization systems where retention, color stability, and primary antioxidant performance are important |
| Antioxidant 1010 | Primary, hindered phenol | Broad polymer stabilization with low volatility and high extraction resistance | General-purpose long-term stabilization across many polymer families; often combined with phosphites |
| Antioxidant 1076 | Primary, hindered phenol | Long-term thermal stabilization with broad compatibility and good color retention | Polyolefins, engineering plastics, elastomers, adhesives, and other organic substrates where formulation compatibility is important |
| Antioxidant 168 | Secondary, phosphite | Decomposes hydroperoxides during processing and helps protect primary antioxidant capacity | Compounding, fabrication, and recycling systems that benefit from synergistic processing stabilization |
Antioxidant 3114 vs. Antioxidant 1010
Both Antioxidant 3114 and Antioxidant 1010 are high-molecular-weight hindered phenolic antioxidants intended for processing and long-term thermal stabilization. Both are described by BASF as having good compatibility, low volatility, and high resistance to extraction. Therefore, the decision between them should not be reduced to a simplistic “stronger versus weaker” ranking. Polymer type, process temperature, additive package, solubility or dispersion behavior, color target, regulatory needs, availability, cost-in-use, and aging results should drive the final choice.
Antioxidant 3114 vs. Antioxidant 1076
Antioxidant 1076 is another widely used sterically hindered phenolic primary antioxidant. BASF describes it as non-discoloring, light-stable, compatible with many substrates, low in volatility, and resistant to extraction. Antioxidant 3114 offers a different molecular structure and a high melting range, which can be relevant in certain formulation and processing contexts. The preferred option should be confirmed by side-by-side testing in the actual resin and process.
Antioxidant 3114 vs. Antioxidant 168
This is not a direct substitution comparison. Antioxidant 3114 is a primary antioxidant, while Antioxidant 168 is a secondary phosphite processing stabilizer. BASF states that Irgafos® 168 reacts with hydroperoxides formed during polymer autoxidation and helps prevent processing-induced degradation while extending the performance of primary antioxidants. In many systems the technical question is therefore not “3114 or 168?” but “what ratio and total stabilization package provide the required processing and long-term performance?”
How to Select and Use Antioxidant 3114
Selection should start with the failure mode. If the key problem is melt-flow drift after multiple extrusion passes, color formation during compounding, loss of impact strength after heat aging, or oxidation during long-term service, the formulation team should identify which stage of degradation is dominant. That assessment determines whether a primary antioxidant alone is sufficient or whether a synergistic package is more appropriate.
- Define the polymer, resin grade, fillers, pigments, flame retardants, catalyst residues, and other additives already present.
- Record realistic processing temperature, residence time, shear history, drying conditions, and the number of heat histories expected.
- Select a practical screening range. For polyolefins, BASF lists approximately 0.05–0.3% Antioxidant 3114 as a typical concentration range, while emphasizing that the optimum level is application-specific.
- If processing oxidation is significant, evaluate a synergistic secondary antioxidant such as Antioxidant 168 rather than simply increasing the phenolic antioxidant level.
- Run controlled comparisons using melt-flow retention, color, oven aging, mechanical properties, odor, volatile loss, migration or extraction, and any application-specific compliance tests.
- Confirm that the final formulation meets regulatory, food-contact, medical, electrical, automotive, or other market-specific requirements before commercialization.
Common Formulation Mistakes to Avoid
- Assuming a higher antioxidant dosage always produces better performance. Excess additive can create cost, compatibility, color, migration, or processing issues.
- Treating a primary antioxidant and a phosphite as interchangeable. They perform different stabilization functions.
- Choosing an antioxidant only from melting point or molecular weight without testing it in the real resin and process.
- Ignoring interactions with pigments, fillers, UV stabilizers, flame retardants, metal residues, and other additives.
- Using a supplier’s typical dosage as a guaranteed formulation. Technical guidance is a starting point; the optimum concentration is application-specific.
Frequently Asked Questions
Is Antioxidant 3114 a primary or secondary antioxidant?
Antioxidant 3114 is a sterically hindered phenolic primary antioxidant. Its role is to interrupt radical oxidation reactions. It can be combined with a secondary antioxidant, such as a phosphite, when a broader processing and long-term stabilization package is required.
What is the CAS number of Antioxidant 3114?
The CAS number is 27676-62-6. The chemical is commonly described as tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate or by the more systematic triazine-trione chemical name used in supplier literature.
What polymers can use Antioxidant 3114?
Manufacturer technical literature includes polyethylene, polypropylene, polybutene, styrene homo- and copolymers, linear polyesters, PVC, polyamides, polyurethanes, SBS, EPR, EPDM, other synthetic rubbers, adhesives, tackifier resins, and other organic substrates.
What is the typical dosage of Antioxidant 3114 in polyolefins?
BASF technical guidance states that typical levels in polyolefins are about 0.05–0.3%, depending on the substrate, processing conditions, and long-term thermal-stability requirements. The optimum level must be confirmed for the specific application.
Can Antioxidant 3114 be combined with Antioxidant 168?
Yes. BASF specifically highlights the effectiveness of Irganox® 3114 used with Irgafos® 168. This pairing combines a primary hindered phenol with a secondary phosphite processing stabilizer, giving complementary antioxidant mechanisms.
Is Antioxidant 3114 better than Antioxidant 1010?
Not universally. Both are effective primary hindered phenolic antioxidants with low-volatility and extraction-resistant characteristics. The better choice depends on polymer chemistry, processing conditions, additive interactions, color requirements, regulatory needs, and actual aging data.
Does Antioxidant 3114 replace a UV stabilizer?
No. BASF notes that the product contributes to light stability, but an antioxidant is not automatically a replacement for a dedicated UV absorber or hindered amine light stabilizer when the application requires strong resistance to ultraviolet exposure.
Conclusion
Antioxidant 3114 is a versatile hindered phenolic primary antioxidant for polymers and other organic substrates where thermo-oxidative protection, low volatility, high extraction resistance, compatibility, and color stability are important. Its broad application range includes polyolefins, styrenics, polyesters, PVC, polyamides, polyurethanes, elastomers, adhesives, and tackifier resins. In polyolefins, supplier guidance places typical use levels around 0.05–0.3%, but the correct concentration must be established through application testing.
For demanding processing conditions, the most effective strategy is often to think in terms of a stabilization system rather than a single additive. Antioxidant 3114 can provide the primary radical-scavenging function, while Antioxidant 168 or another appropriate secondary stabilizer can address hydroperoxides formed during processing. Comparing Antioxidant 3114 with Antioxidant 1010 or Antioxidant 1076 should likewise focus on the complete formulation, process history, performance targets, and cost-in-use. A technically validated package will normally outperform a decision based only on a product name or generic dosage recommendation.
