SUNNOX® 168 is a phosphite processing stabilizer (equivalent to Irgafos® 168) based on tris(2,4-di-tert-butylphenyl) phosphite, providing excellent processing stability and color retention for polyolefins and engineering plastics. It works synergistically with hindered phenolic antioxidants to provide comprehensive thermal and oxidative protection during polymer processing. SUNCHEM supports international buyers with SUNNOX® 168 sourcing from qualified Chinese producers, with quality documentation, export coordination, and logistics support.
Applications & Uses
Processing stabilizer for polyolefins (PE, PP)
Phosphite antioxidant in polymer compounding
Synergistic co-stabilizer with phenolic antioxidants
SUNNOX® 168 sourcing requires careful verification of manufacturers, compliance with export documentation, and proper logistics management. SUNCHEM supports global customers by connecting them with qualified Chinese producers and managing the key steps from sourcing to shipment.
Qualified Producer Selection
We help customers identify suitable Chinese manufacturers based on product specifications, production scale, quality records, and export capability.
Quality & Document Support
We coordinate documents including COA, MSDS, TDS, product specifications, and other export-related documents required for international trade.
Export & Logistics Coordination
SUNCHEM works with experienced logistics partners to ensure safe and compliant shipment arrangements, including proper handling for regulated materials.
Flexible Sourcing Solutions
Whether you require regular commercial supply, trial orders, or long-term procurement support, we match suitable supply sources to your requirements.
Long-Term Supply Management
We help manage supplier communication, quality follow-up, shipment schedules, and supply chain stability.
Ready to Source SUNNOX® 168 from China?
Send us your required purity, quantity, destination port, and documentation needs. Our team will respond with quotation details and available product documents.
SUNNOX® 168 is a phosphite secondary antioxidant for polymer processing. Used with phenolic primary antioxidants, it helps improve stability during thermal processing.
CAS 31570-04-4 · Phosphite antioxidant · White crystalline powder
Antioxidant 168 decomposes hydroperoxides formed during polymer thermal processing. The supplied TDS describes use with phenolic primary antioxidants such as 1010 or 1076 in polyolefins, polyamide, polycarbonate and ABS. Select the grade and combination against your resin, processing conditions and agreed specification.
The specifications below are from the SUNNOX-168 TDS. Confirm the specification for the offered grade before ordering.
Key Benefits
Processing stabilization
Helps decompose hydroperoxides generated during thermal processing of polymer materials.
Complementary protection
Used with phenolic primary antioxidants as part of a combined stabilization system; the TDS states that it is generally not used alone.
Multiple polymer families
The TDS lists PE, PP, PA, PC and ABS. Suitability and addition level need evaluation in the intended formulation.
Technical Specifications
Specifications from the SUNNOX-168 TDS. Confirm agreed limits before ordering; request a batch COA for supplied material.
Parameter
Information
Product Name
Antioxidant 168
Brand
SUNNOX® 168
CAS No.
31570-04-4
Chemical Name
Tris(2,4-di-tert-butylphenyl) phosphite
Molecular Formula
C42H63O3P
Molecular Weight
646
Antioxidant Type
Phosphite / secondary antioxidant
Appearance
White crystalline powder
Assay
≥99.0%
Melting Point
183–187 °C
Light Transmittance (425 nm)
≥98%
Light Transmittance (500 nm)
≥98%
Volatile Matter
≤0.5% (105 °C, 2 hours)
Applications by Polymer Industry
Choose a material family to review its application context. These are the polymer families listed in the supplied TDS.
📦
Polymer Applications
Polyolefin Processing — PE & PP
The supplied TDS identifies polyethylene and polypropylene as application materials for antioxidant systems containing 168 and phenolic primary antioxidants.
What to confirm for your application
Specify the PE or PP resin grade and the processing operation.
Include existing stabilizers and any masterbatch carrier in the evaluation.
Agree trial conditions and acceptance criteria before changing the package.
Polyamide is listed in the TDS as an application material. Review the proposed antioxidant combination for the specific PA grade and production conditions.
What to confirm for your application
Identify the PA grade and relevant processing history.
Provide the complete additive package for compatibility review.
Confirm performance through application-specific trials.
ABS resin is listed as a potential application for combined antioxidant systems. Selection should consider the actual resin formulation and processing requirements.
What to confirm for your application
Provide the ABS grade and any other additives in the system.
Describe the processing issue and expected heat history.
Confirm dosage and suitability in a documented trial.
25 kg net bags or cartons, as stated in the supplied TDS. Customer-specific packaging may be arranged; confirm the configuration in the quotation.
Storage
Protect from moisture and heat, following the supplied TDS. Confirm grade-specific handling instructions in the SDS. No storage temperature or shelf life is stated in this TDS.
Intended use
For general chemical use; not for use as a food additive, as stated in the TDS. Food-contact suitability is a separate, grade- and end-use-specific documentation review.
Technical & Buying Information
Selecting an Antioxidant System
Customer Requirement
Selection Direction
Processing stability during extrusion or molding
Antioxidant 168
Long-term oxidative stability
Primary phenolic antioxidant
Processing + long-term protection
Primary + secondary antioxidant combination
PE / PP processing
168 commonly used as part of antioxidant systems
Masterbatch production
Consider compatibility with complete additive package
Antioxidant Comparison
Product
Type
Main Role
Typical Use
SUNNOX® 168
Phosphite / Secondary
Processing stabilization
Combined with primary antioxidant
SUNNOX® 1010
Phenolic / Primary
Long-term oxidative protection
Primary stabilization
SUNNOX® 1076
Phenolic / Primary
Long-term oxidative protection
Primary stabilization
SUNNOX® DLTDP
Thioester / Secondary
Long-term heat-aging support
Synergistic with primary antioxidants
Available Documents
COA
Certificate of Analysis — Batch-specific quality information
TDS
Technical Data Sheet — Product specification and information
SDS
Safety Data Sheet — Handling and safety information
Specification
For supplier qualification and comparison
Packing Info
Packaging configuration and shipping details
Regulatory Docs
Available based on grade, application and destination
Antioxidant 168 Buyer Guide
Define the processing problem
Record the resin grade, processing sequence and observed change. Distinguish protection during processing from long-term service performance. Include rework or recycled content where relevant.
Review the complete formulation
Identify existing stabilizers, pigments, fillers and processing aids. The TDS describes combinations with phenolic primary antioxidants; it does not prescribe one dosage or blend ratio for every resin.
Compare documents and run a trial
Compare the offered specification, test conditions and batch COA with your approved requirements. Evaluate a candidate under documented processing conditions before approving a production change.
Confirm the supply and end-use requirements
Agree packaging, quantity, destination and required documents. Check any end-use approvals separately from processing performance. A matching CAS number alone does not qualify a replacement grade.
Request a Quotation for Antioxidant 168
Start with your polymer, required quantity and destination. Include your current grade or specification if available.
Which polymers are listed in the Antioxidant 168 TDS?
The supplied TDS lists polyethylene (PE), polypropylene (PP), polyamide (PA), polycarbonate (PC) and ABS. These are application families, not blanket approval for every formulation or finished article. Confirm the grade, additive package and processing requirements before selection.
Can Antioxidant 168 be used alone?
The supplied TDS states that it is generally used with phenolic primary antioxidants such as 1010 or 1076. It does not specify a universal addition level or mixing ratio. Select and evaluate the combination for the actual polymer formulation.
Can I qualify a second supply source without changing my approved specification?
Use your current approved specification as the starting point and ask whether the proposed supply option can be assessed against it. Keep the document comparison, sample evaluation and internal approval steps separate. A second source should remain a candidate until your qualification process is complete.
Can we start a discussion if our formulation is confidential?
You can begin with non-confidential information such as the polymer family, application, processing concern and required product specification. Identify which details cannot be shared openly and ask how a more detailed technical exchange can be arranged.
Is a small sample enough to approve a commercial order?
A sample can support an initial evaluation, but the scope of approval depends on your qualification procedure and the representativeness of the material tested. Before relying on the result, confirm the sample identity, accompanying documentation and relationship to the proposed commercial grade.
What should I do if the received COA differs from the agreed specification?
Identify the specific parameter, unit or test method that differs and send the agreed specification together with the relevant COA to the supply contact. Ask for clarification before accepting the material into the approved process.
Discuss Your Antioxidant 168 Requirements
Send your application, specification and quantity to request a quotation or supporting documents.
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Characteristics
Melting Point181-184 °C(lit.)
Boiling Point594.2 °C at 760 mmHg
Flash Point394 °C
Frequently Asked Questions
Yes. SUNCHEM helps international buyers source SUNNOX® 168 from qualified Chinese producers and supports quotation, documentation, packaging, and export coordination according to customer requirements.
The CAS number of SUNNOX® 168 is 31570-04-4.
Available documents may include COA, SDS / MSDS, TDS, product specification, packing information, and other export-related documents depending on supplier availability and order requirements.
Yes. For suitable orders, SUNCHEM can coordinate COA and MSDS / SDS documents for customer review before shipment.
Please provide the product name, CAS number, required purity or specification, order quantity, destination port or country, packaging requirements, and any required documents.
Yes. SUNCHEM can coordinate export documentation, packaging discussion, and logistics arrangements with experienced partners according to product properties and destination requirements.
SUNNOX® 168 may be subject to regulatory control in certain countries or regions. Customers should confirm local import requirements before placing an order. SUNCHEM can support documentation and shipment coordination based on applicable trade requirements.
Yes. SUNCHEM can support regular supply, trial orders, and long-term procurement projects by matching suitable Chinese producers and following up on quality, documents, shipment schedules, and supply stability.
Antioxidant 168 Supplier in China for Polymer Processing Stability
A phosphite secondary antioxidant that decomposes hydroperoxides formed during polymer processing, protecting color and mechanical properties — engineered to work alongside Antioxidant 1010 for complete oxidative protection.
CAS 31570-04-4Secondary Antioxidant · PhosphiteSame Category as Irgafos® 168✓ Quality-Controlled Sourcing✓ Export Documentation Support✓ Multi-Office Global Team
Direct Technical ContactNot a generic contact-form black hole
Export & Compliance SupportDocumentation coordinated per shipment
Product Overview
WHAT IS ANTIOXIDANT 168?
Antioxidant 168 (SUNNOX® 168, CAS 31570-04-4) is a phosphite secondary antioxidant belonging to the same product category as Irgafos® 168, a widely recognized industry reference point. It is based on tris(2,4-di-tert-butylphenyl) phosphite and used across polyolefins, engineering plastics, and other polymer systems as a processing stabilizer.
WHY IS IT USED?
As a secondary antioxidant, Antioxidant 168 decomposes hydroperoxides — unstable intermediates that form when polymers are exposed to heat and shear during processing. Left untreated, hydroperoxides break down into new free radicals and accelerate degradation. Antioxidant 168 converts them into stable, non-radical products before that chain reaction can restart, which is a different mechanism from a primary antioxidant such as Antioxidant 1010, which scavenges free radicals directly.
WHAT CHALLENGES DO BUYERS FACE WITHOUT IT?
Processing-stage discoloration — hydroperoxide buildup during melt processing drives yellowing and loss of clarity, even when a primary antioxidant is already present. Reduced antioxidant system life — without a phosphite secondary, hydroperoxides accelerate the consumption of primary phenolic antioxidants, shortening their effective protection window. Quality consistency — as with any polymer additive, inconsistent performance from batch to batch creates unpredictable finished-product quality.
HOW DOES IT HELP POLYMER MANUFACTURERS?
Antioxidant 168 helps hold color and clarity steady through repeated heat history in extrusion, injection molding, and compounding, and extends the effective protection window of the primary antioxidant it is paired with. Antioxidant 168 is frequently used alongside a primary antioxidant such as Antioxidant 1010 for broader, complementary protection — see the synergy section below.
Technical Specifications
CHEMICAL INFORMATION
CAS No.
31570-04-4
Chemical Formula
C42H63O3P
Chemical Synonyms
Irgafos® 168; Irganox® 168; Songnox® 1680; Hostanox PAR 24; ADK Stab 2112; Alkanox 240; Tris(2,4-di-tert-butylphenyl) phosphite — full synonym list available on request
PROPERTIES
Melting Point
181–184 °C (lit.)
Boiling Point
594.2 °C at 760 mmHg
Flash Point
394 °C
Appearance
Pending SUNCHEM confirmation — typical commercial form (e.g. powder/granule) to be confirmed against the actual sourced grade
Storage Recommendation
Pending SUNCHEM confirmation — phosphite antioxidants are generally moisture/hydrolysis-sensitive; specific storage temperature and shelf-life data to be confirmed
APPLICATION NOTES
Antioxidant Type
Secondary (phosphite), hydroperoxide decomposer
Common Pairing
Frequently combined with a primary phenolic antioxidant — e.g. Antioxidant 1010 — for synergistic protection
Dosage
Pending SUNCHEM confirmation — varies by polymer and process; contact SUNCHEM's technical team for guidance specific to your application
Applications & Industries Served
Polyolefins (PE / PP)
Melt-processing stabilizer that helps prevent chain scission and color degradation during extrusion and injection molding.
Engineering Plastics (PA, PET)
Processing stabilizer for higher-temperature compounding, where oxidation risk rises with processing temperature.
Film & Fiber Extrusion
High-surface-area processes are especially oxidation-sensitive; helps maintain clarity and mechanical strength through repeated thermal cycling.
Compounding & Masterbatch
Standard co-stabilizer paired with a primary phenolic antioxidant, such as Antioxidant 1010, in stabilizer packages.
Food-Contact Polymer Packaging
Used in food-contact resin systems in the industry. Pending SUNCHEM confirmation of the specific regulatory reference (FDA/EU) for the sourced grade before this is stated as a compliance claim.
Why Antioxidant 168 Is Used With Antioxidant 1010
Antioxidant 168 (secondary, phosphite) and Antioxidant 1010 (primary, hindered phenolic) protect polymers at two different points in the oxidative degradation cycle. Antioxidant 1010 scavenges free radicals as they form, interrupting the chain reaction. Antioxidant 168 decomposes the hydroperoxides that accumulate as a by-product of that same reaction, before they can break down into new radicals and restart the cycle.
Used together, the two provide more complete and longer-lasting protection than either used alone — Antioxidant 168 also helps protect Antioxidant 1010 from being consumed too quickly, extending the useful stabilization window during high-temperature processing.
Dosage guidance pending SUNCHEM confirmation: industry practice commonly pairs primary and secondary antioxidants at roughly a 1:1 to 2:1 ratio (primary : secondary) in polyolefin stabilizer packages, though the exact ratio depends on resin type, processing conditions, and end-use requirements. This range is general industry guidance, not a verified SUNCHEM-specified figure — to be confirmed by SUNCHEM's technical team before publishing.
Comparison / Equivalents — Antioxidant 168 vs Antioxidant 1010
Antioxidant 168 (SUNNOX® 168)
Antioxidant 1010 (SUNNOX® 1010)
CAS No.
31570-04-4
6683-19-8
Type
Secondary antioxidant (phosphite)
Primary antioxidant (hindered phenolic)
Mechanism
Hydroperoxide decomposer
Free-radical scavenger
Primary Role
High-temperature processing stability
Long-term thermo-oxidative protection
Often Combined With
Antioxidant 1010 (see right)
Antioxidant 168 (see left)
Antioxidant 168 and Antioxidant 1010 act through different, complementary mechanisms — peroxide decomposition versus radical scavenging. Combining them provides broader protection across both the high-heat processing stage and the long-term service life of the finished polymer, a standard antioxidant system pairing in the plastics industry. For a full breakdown of when to use each, or both, see Antioxidant 1010 vs 168: How to Choose. View Antioxidant 1010 →
SUNNOX® 168 is SUNCHEM's sourced equivalent to the phosphite antioxidant widely known by the trade name Irgafos® 168, sharing the same CAS number (31570-04-4) and chemical structure.
Why Source Antioxidant 168 From SUNCHEM
Sourcing SUNNOX® 168 requires careful verification of manufacturers, compliance with export documentation, and proper logistics management — including packaging and handling suited to a moisture-sensitive phosphite antioxidant. SUNCHEM supports global customers by connecting them with qualified Chinese producers and managing the key steps from sourcing to shipment.
Qualified Producer Selection
We help customers identify suitable Chinese manufacturers based on product specifications, production scale, quality records, and export capability.
Quality & Document Support
We coordinate documents including COA, SDS, TDS, product specifications, and other export-related documents required for international trade.
Export & Logistics Coordination
SUNCHEM works with experienced logistics partners to ensure safe and compliant shipment arrangements, including proper handling for moisture-sensitive materials.
Flexible Sourcing Solutions
Whether you require regular commercial supply, trial orders, or long-term procurement support, we match suitable supply sources to your requirements.
Long-Term Supply Management
We help manage supplier communication, quality follow-up, shipment schedules, and supply chain stability.
SUNCHEM Supply Chain Process
1
Customer Requirement
Purity, packaging, and destination captured.
2
Supplier Evaluation
Manufacturers qualified for phosphite-antioxidant handling and consistency.
3
Quality Confirmation
Assay, appearance, melting point verified against spec.
4
Production Coordination
Scheduling and tracking managed with the manufacturer.
5
Inspection & Documentation
Pre-shipment inspection; COA and packing docs prepared.
6
Export Management
Export documentation and compliance requirements handled.
7
Global Delivery
Coordinated through to destination, one point of contact.
Phosphite antioxidants are moisture-sensitive, quality-sensitive inputs — small purity or handling variation can measurably affect polymer processing results. This process gives Antioxidant 168 buyers consistent, verified quality batch to batch, without managing supplier relationships in China directly.
Documents & Quality
Public Documents
Certificate of Analysis (COA), Safety Data Sheet (SDS), and Technical Data Sheet (TDS) are available upon request.
Pending SUNCHEM confirmation: a published assay/purity specification (e.g. an exact percentage figure) is not yet stated on this page. Recommend confirming the typical sourced-grade specification so it can be published directly rather than only offered on request.
Controlled Documents
For a batch-specific Certificate of Analysis matching your order, or customer-specific documentation, contact our team — we'll provide current documents for your shipment.
Typical packaging options are available for Antioxidant 168. Contact SUNCHEM to confirm current packaging options for your order.
MOQ & Lead Time
Minimum order quantities and lead times depend on current production and your specific requirements — contact SUNCHEM for a solution tailored to your order.
Export & Shipping
SUNCHEM manages export documentation and shipping coordination, arranged per order based on destination and customer requirements.
Frequently Asked Questions
What is Antioxidant 168 used for?
Antioxidant 168 is a phosphite processing stabilizer used during polymer manufacturing to protect against heat- and shear-induced oxidative degradation, primarily in polyolefins (PE, PP) and engineering plastics. It is typically used alongside a primary antioxidant such as Antioxidant 1010.
What is the difference between Antioxidant 168 and Antioxidant 1010?
Antioxidant 168 is a secondary (phosphite) antioxidant that decomposes hydroperoxides; Antioxidant 1010 is a primary (phenolic) antioxidant that scavenges free radicals. They address different stages of polymer oxidative degradation and are commonly used together.
Is Antioxidant 168 the same as Irgafos® 168?
SUNNOX® 168 shares the same CAS number (31570-04-4) and chemical structure as the antioxidant widely known under the trade name Irgafos® 168. SUNCHEM sources it from qualified Chinese manufacturers as a specification-equivalent product.
What ratio of Antioxidant 168 to Antioxidant 1010 is typically used?
Pending SUNCHEM technical confirmation. General industry practice ranges roughly 1:1 to 2:1, depending on resin and processing conditions — contact SUNCHEM's technical team for guidance specific to your application.
Is Antioxidant 168 suitable for food-contact applications?
Pending SUNCHEM regulatory confirmation. A specific FDA/EU reference for the sourced grade has not yet been confirmed — contact SUNCHEM for current compliance documentation.
How is Antioxidant 168 packaged and stored?
Pending SUNCHEM confirmation. Phosphite antioxidants are generally moisture-sensitive; contact SUNCHEM to confirm current packaging and storage recommendations.
Sourcing Antioxidant 168? Let's manage it together.
Request TDS, COA, sample availability or a quotation for Antioxidant 168 based on your polymer, application and destination market.
Sample AvailableSmall-quantity samples for trial and evaluation
COA AvailableCertificate of Analysis provided per batch
Export ExperienceDocumentation and shipment coordination for international buyers
Technical SupportDirect contact with our technical team, not a generic contact form
Tell us your specification, application, and destination — SUNCHEM will manage supplier evaluation, quality verification, and export, from requirement to delivery.
Or contact our team directly — Email: david@sunchemgroup.com · Tel/WhatsApp: +86-18605204888
Antioxidant 168 is part of SUNCHEM's Polymer Antioxidants range — compare it with Antioxidant 1010, 1076, DSTDP, and DLTDP, or browse buyer guides for your application.
