CAS No. [31570-04-4]
Chemical name: Tris-(2.4-di-t-butylphenyl)- phosphite
Molecular formula: C₄₂H₆₃O₃P
Molecular weight: 646.94
Specification:
      Appearance: white crystalline powder
      Melting point: 182 – 186.5°C
      Acidity, mg KOH/g: 0.3% max.
      Volatiles: 0.5% max.
      Free 2,4-di-tert.-butyl-phenol: 0.2% max.
      Transmittance:
                425 nm: 97% min.
                500 nm: 98% min.
      Assay: 99% min.
      Solubility: clear solution
Packing: 25 kg carton
Usage:
      The product is a kind of high-effective solid phosphite ester antioxidant, which is superior to other phosphite ester in the effective protection of polymers’ color. It is often blended with phenolic principal antioxidant (such as Antioxidant 1010) to prepare composite antioxidant which improves the thermo-stability of polymer processing, thus making it widely applied in PE, PP, PS, PA, PC, ABS and many other polymer materials.

Molecular structure: