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Structure:
| Chemical Name | Tris(2,4-di-tert-butylphenyl) Phosphite |
| Synonym | Antioxidant 168/Phosphite 168 |
| Color and Appearance | White crystalline powder or particle |
| CAS | 31570-04-4 |
| Molecular Formula | C42H63O3P |
| Molecular Weight (g/mol) | 646.9 |
| Melting Range °C | 183-187 |
| Heating Loss % | ≤0.3 |
| Acid Value(mgKOH/g) | ≤0.3 |
| Transmittance % | 425nm≥98 500nm≥98 |
| Solubility% | Clear |
| Main Content% | ≥99 |
| Content of 2.4-Di-Tert-Butylphenol % | ≤0.2 |
| Anti-hydrolytic Property | Qualified(in the water at 95°C ,5H) |
| HS CODE | 29209090 |
| Package | Cardboard box lined with plastic bags or Cardboard drum lined with plastic bags 25kg/box(drum) |
| Use | This product provides outstanding long-term heat resistance stabilization, ensuring polymer materials maintain performance under continuous thermal exposure |
Antioxidant 168 is a high-performance organophosphite secondary antioxidant that provides exceptional
processing stability to polymers. By effectively decomposing hydroperoxides, it prevents thermal degradation and
maintains the mechanical properties of plastics during high-temperature extrusion and molding.
—Exceptional Hydrolytic Stability
Unlike standard phosphites, our Antioxidant 168 is engineered for superior hydrolytic stability, ensuring
it remains effective even after long-term storage in humid environments.
—Synergistic Performance with Primary Antioxidants
To achieve maximum protection, Antioxidant 168 is typically used in combination with hindered phenolic
antioxidants (such as Antioxidant 1010 or 1076). This synergy prevents yellowing and maintains the melt flow index (MFI)
of the polymer.
—Low Volatility and High Heat Resistance
Its high molecular weight ensures minimal loss during high-heat processing, making it ideal for
polycarbonate (PC) and polypropylene (PP) applications.
Our Antioxidant 168 is a versatile additive used across various industries to extend product lifecycle:
—Polyolefins:Critical for PE and PP film, fiber, and injection molding.
—Engineering Plastics:Used in ABS, PC, Polyamides, and Polyesters.
—Adhesives & Coatings:Provides thermal stability for hot-melt adhesives and solvent-based coatings.
—Food Packaging:Complies with FDA regulations for indirect food contact applications
—What is the primary function of Antioxidant 168 in polymers?
Antioxidant 168 acts as a secondary antioxidant (process stabilizer). It works by decomposing hydroperoxides
formed during the thermal processing of polymers (like extrusion or injection molding), effectively preventing polymer
degradation, yellowing, and changes in melt flow index.
—Can Antioxidant 168 be used alone?
While it can be used alone, it is highly recommended to use it in combination with primary hindered phenolic antioxidants
(such as Antioxidant 1010 or 1076). This synergistic blend provides both processing stability and long-term thermal
aging protection for the final product.
—Is Antioxidant 168 safe for food-contact packaging?
Yes, our Antioxidant 168 is FDA-compliant for use in many food-contact applications, including polyolefins and
engineering plastics. Please contact our technical team for specific migration limits and regulatory documentation
(REACH/RoHS) tailored to your region.
—How does the hydrolytic stability of your Antioxidant 168 compare to others?
Our product undergoes a specialized crystallization process to ensure high purity (≥99.0%), which significantly improves
its hydrolytic stability. This means it is less prone to moisture absorption and decomposition during storage compared
to lower-grade phosphites.
—What is the typical addition level (dosage) for PP and PE?
For most polyolefins (PP/PE), the recommended dosage is between 0.05% and 0.20%. The exact amount depends on your specific
resin grade, processing temperature, and whether you are using a pre-blended system like Antioxidant B215 or B225.
—What are the available packaging and shipping options for bulk orders?
We offer standard 25kg moisture-proof bags . As a global supplier, we provide flexible shipping terms (FOB, CIF, DAP) with
strategic warehousing to ensure shortened lead times for high-volume industrial users.
The company pursues the concept of “continuous innovation, the pursuit of first-class”, and is willing to provide domestic and foreign customers with high-quality products and satisfactory service.
