Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

SI Group AT-168 Antioxidant

SI Group AT-168 Antioxidant is a high-performance phosphite-based stabilizer from SI Group’s AT-series, widely used in polyolefins and engineering plastics to prevent thermal oxidative degradation during processing and long-term service. It offers excellent melt stability, low volatility, and synergistic effects with phenolic antioxidants.
  • si group at 168 antioxidant_b632809b
  • si group at 168 antioxidant_b632809b

Features Of SI Group AT-168 Antioxidant

  1. Highly effective secondary antioxidant based on tris(2,4-di-tert-butylphenyl) phosphite.

  2. Excellent hydrolytic stability and low volatility for long-term thermal protection.

  3. Superior compatibility with polyolefins, engineering thermoplastics, and elastomers.

  4. Minimizes color formation during processing and end-use aging.

  5. Non-staining and non-migrating—ideal for demanding appearance-critical applications.

Typical Applications Of SI Group AT-168 Antioxidant

  1. Polypropylene (PP) fibers and nonwovens for medical and hygiene products.

  2. Polyethylene (PE) blow-molded containers and HDPE pipes.

  3. Automotive interior components including PP dashboards and trim parts.

  4. Food-contact packaging films requiring FDA-compliant stabilization.

  5. Recycled polyolefin compounds where processing stability is critical.

Specifications Of SI Group AT-168 Antioxidant

Chemical TypeOrganophosphite secondary antioxidant
Product FormFree-flowing white to off-white crystalline powder
AppearanceCrystalline solid, free from visible impurities
Melting Point195–205 °C (determined by DSC)
Assay (by HPLC)≥ 99.0%
Loss on Drying≤ 0.3% at 105 °C, 2 hours
SolubilityFreely soluble in chloroform, toluene, and xylene; insoluble in water
Primary ApplicationsPolyolefins, engineering plastics, elastomers, and recycled resins


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