Antioxidant 168, scientifically known as Tris(2,4-di-tert-butylphenyl) phosphite or simply TNPP, is an effective phosphite antioxidant widely used as a thermal stabilizer for polymers in the plastics industry. It is one of the most important additives for preventing oxidation and chain degradation of polymers during processing and throughout the product’s lifetime.

Physical and Chemical Properties of Antioxidant 168:
• Appearance: White powder
• Solubility: Soluble in organic solvents such as benzene, chloroform, and cyclohexane; slightly soluble in acetone and ethanol; insoluble in water and other polar solvents such as alcohols and esters
• Low toxicity
• Low volatility
• High thermal stability
• Excellent resistance to thermal and light degradation

This compound acts as a secondary antioxidant and is usually used together with primary phenolic antioxidants such as Antioxidant 1010 to enhance the thermal and light stability of polymers.

Applications of Antioxidant 168:
Antioxidant TNPP is widely used in combination with phenolic antioxidants to improve the processing and performance stability of polymers, such as:
• Polyethylene (PE)
• Polypropylene (PP)
• Polystyrene (PS)
• Polycarbonate (PC)
• Acrylonitrile Butadiene Styrene (ABS)
• Polyamide (PA)
• Other olefinic copolymers

Advantages of Using Antioxidant 168 in Industry:
• Increases the service life of plastics
• Prevents discoloration and surface degradation
• Maintains mechanical and physical properties of polymers
• Improves processing stability

Antioxidant 168 is a vital additive in the polymer and plastics industry. As a complementary antioxidant to primary antioxidants, it prevents thermal and oxidative degradation. Its high stability, low toxicity, and wide compatibility with various polymers make it a popular choice for producing heat- and light-resistant plastic products.

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