About This Product
Antioxidant 168, tris(2,4-di-tert-butylphenyl) phosphite, CAS 31570-04-4, is a white powder or granule and the most widely used phosphite secondary antioxidant. Its role is different from that of a hindered phenol. A primary antioxidant stops radicals that already exist; a secondary antioxidant removes the hydroperoxides that would otherwise decompose into two new radicals each, cutting off the branching step that makes autoxidation accelerate. The phosphite is oxidised to a phosphate in doing so. Used together, the two classes are markedly more effective than either alone, which is why phenol-phosphite blends are standard in polyolefin stabilisation packages. Phosphite is particularly valuable during melt processing, where it protects colour and melt-flow stability through repeated extrusion. Declared applications are the same polyolefin resins, ABS, polyurethane, polyformaldehyde, synthetic rubber and petroleum products as the phenolic grades.
Specifications
Applications
Packaging Options
- White powder or granule; 20 kg or 25 kg/bag, 12,000 kg/20' container
- White powder or granule; 20 kg/carton, 10,000 kg/20' container
Supply notes
- Exact chemical identity
- Our team confirms the agreed specification with your quotation.
- Product documentation
- Contact our team for current specifications, safety data and available batch documentation.
- Packaging
- Our team confirms pack size and packaging material with your quotation.
Indicative price: $1.00–8.50/kg
Indicative bulk guide only. Prices are market-linked and updated regularly - please request a quote for current pricing and volume rates.
