June 30, 2026

Sulfur Antioxidants vs Phenolic Antioxidants: Key Differences

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Chemical Classification

Phenolic Antioxidants (Primary)

  • Antioxidant 1010 (CAS 6683-19-8): High MW tetrafunctional, polyolefin standard
  • Antioxidant 1076 (CAS 2082-79-3): Monofunctional, cost-effective
  • Antioxidant 1098 (CAS 23128-74-7): Preferred for polyamides

Sulfur (Thioester) Antioxidants (Secondary)

  • DLTDP (CAS 123-28-4): C12 chains, standard polyolefin grade
  • DSTDP (CAS 693-36-7): C18 chains, high-temperature preferred

Mechanism Comparison

Phenolic antioxidants scavenge free radicals directly — donating hydrogen to peroxy radicals to break chain propagation. They are primary antioxidants.

Thioester antioxidants decompose hydroperoxides (ROOH → ROH), preventing reinitiation of the radical chain. They are secondary antioxidants.

Application Selection

  • Choose phenolic-dominant system when service-life thermal aging is the primary concern
  • Include thioester when long-term thermal stability is required, or for cost optimization
  • For processing temperatures >220°C, prefer phosphite (Antioxidant 168) over thioester as secondary
  • For food contact, verify specific regulatory clearance for each grade

Contact SUNCHEM

Both phenolic and thioester antioxidant grades available from SUNCHEM with full technical documentation. Contact us for pricing and samples.

Article written by market
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