Chemical name:

Isodecyl diphenyl phosphite


specialty products, specialty additives

Markets and applications:

building & construction, other applications, CASE, adhesives, coatings, elastomers, paints & coatings, plastics, polymer additives, transportation, other applications


antioxidants, heat stabilizers, thermal & processing stabilizers




PCC Rokita SA Phosphorus Chemistry Business Unit

CAS No.:



Rostabil DPDP is a secondary antioxidant in the form of a homogeneous liquid with a characteristic, delicate fragrance. It effectively prevents degradation of polymeric materials, eliminating the effect of yellowing of finished products. Rostabil DPDP stabilizes the polymer processing process, providing effective thermal protection. At the same time, it significantly enhances the colour stability of pigment-containing materials and provides transparency to non-pigmented products.

 In the context of polymeric materials, the term degradation (aging) is used to determine changes in physical properties caused by chemical reactions. As a result of these reactions, the polymer chain ruptures, which causes a decrease in the molar mass of the macromolecular compound. These changes directly affect the course of the processing process and the functional properties of finished products, i.e. colour, gloss, shade.

By using Rostabil DPDP together with the primary stabilizers, a synergy effect is obtained, effectively inhibiting the degradation process. Rostabil DPDP is one of the ingredients of "mixed metals" mixtures, together with zinc, barium or calcium stearates in PVC processing. It also works effectively in thermal processing processes in the production of powder paints with phenolic and amine stabilizers.

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Properties and applications:

Product application advantages:


  • eliminates the effect of yellowing of materials during processing,
  • enhances the colour stability of polymeric materials containing pigments,
  • provides transparency in non-pigmented materials,
  • prevents degradation processes during thermal processes,
  • acts synergistically with amine and phenolic stabilizers,
  • one of the components of "mixed metals" mixtures in PVC processing,
  • high hydrolytic stability,
  • no negative effect on the mechanical properties of the material.



  • C.A.S.E. (coatings, adhesives, sealants, elastomers),
  • construction (roofing and roofing membranes, construction materials, window frames, PVC pipes),
  • plastics (production of synthetic rubber, SBR, technical films),
  • textiles (coated fabrics, artificial leather),
  • electronics (cables and wires),
  • furniture (polyurethane foam for the production of mattresses),
  • motorization (powder paints, acoustic insulation).

Alternative names:

Show alternative names
DPDP; phosphorous acid isodecyl diphenyl ester; diphenylisodecyl phosphite; phosphite; phosphite ester; organophosphite; organophosphorous compound; alkyl-aryl phosphite; (Hide)


stabilizer antioxidant anti-ageing degradation prevention degradation counteraction degradation decomposition ageing discoloration yellowing yellowness yellowness index oxidation induction time accelerated ageing colour change stability multiple processing polymers cross-linking synergist synergy synergism secondary additive secondary additive co-stabilizer phenolic stabilizers additive phenolic stabilizers synergist stearic stabilizers additive calcium stearate zinc stearate barium stearate long chain fatty acids salts higher fatty acids salts mixtures thermal process processing functional properties phosphorus derivatives phosphite thermal stability plastic additives plastics aid PVC PCW polyvinyl chloride poly(vinyl chloride) soft hard dry blends powders granules masterbatches epoxy resins epoxides polyester resins polyesters acrylic resins acrylates vinyl ester resins vinyl esters sprays coatings
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