Description

Antioxidant 168 CAS NO 31570-04-4 is a high-performance phosphite processing stabilizer widely used as a secondary antioxidant in polymer systems. It functions synergistically with primary phenolic antioxidants to provide superior long-term thermal stability and color protection during high-temperature processing. This product is essential for manufacturers in the plastics, synthetic fiber, and rubber industries seeking to enhance the durability and lifespan of their polymer products.

Application

• Primary use as a synergistic processing stabilizer in combination with phenolic antioxidants (e.g., Irganox 1010) for polyolefins (PP, HDPE, LDPE).
• Protection of engineering plastics such as polyamides (nylon), polyesters (PET, PBT), and polycarbonates against thermal degradation during extrusion and molding.
• Stabilization of synthetic rubbers and elastomers to prevent chain scission and maintain mechanical properties.
• Enhancement of color stability in pigmented masterbatches and compounded polymers, preventing yellowing.
• Application in adhesives and hot-melt formulations to ensure consistent performance under thermal stress.
• Use in wire and cable insulation compounds to meet long-term thermal aging requirements.

Basic Information

Product Name	Antioxidant 168
CAS No.	31570-04-4
Molecular Formula	C42H63O3P
Molecular Weight	646.9 g/mol
Synonyms	Tris(2,4-di-tert-butylphenyl) phosphite; Phosphorous acid, tris(2,4-bis(1,1-dimethylethyl)phenyl) ester; Irgafos 168; Alkanox 240; Ultranox 626; Hostanox PAR 24; Songnox 1680; AO-168
EINECS	250-709-6

Quality Control

Our Antioxidant 168 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets the high-purity standards required for sensitive polymer applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the original container tightly sealed to prevent absorption of atmospheric moisture, which can lead to hydrolysis and reduced efficacy.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 99.0 %
Melting Point	180 - 185 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.1 %
2,4-Di-tert-butylphenol	≤ 0.2 %
Solution Color (APHA)	≤ 50

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.