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Product Manager

Grade Food Grade/Tech Grade
Formula C41H82O6P2
CAS No. 3806-34-6
EC No. 223-276-6
Molecular Weight 733.0337
3,9-Bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; O,O-dioctadecylpentaerythritol bis(phosphite); Distearylpentaerythritol Diphosphite; Distearylpenta-di-phosphite; Antioxidant 618; Distearic pentaerythritol diphosphite; Distearyl pentaerythrityl diphosphite; Distearyl pentaerythritol diphosphate;


Antioxidant 618 is a chemical compound commonly employed as an antioxidant and stabilizer in various industrial applications. Also known as Octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, Antioxidant 618 belongs to the family of hindered phenolic antioxidants. Its primary function is to inhibit the oxidation processes that can lead to the degradation of materials such as polymers, plastics, and rubbers.


Antioxidant 618 is like a protector for materials used in different industries. It prevents these materials, like plastics and rubbers, from getting damaged due to a process called oxidation. This protector is especially good at stopping reactions that can harm the structure of these materials. By doing this, Antioxidant 618 helps these materials last longer and stay strong. It’s like a shield that keeps things in good shape, especially when they face heat and other factors that could cause damage.


Antioxidant 618 excels in extending the lifespan of materials and is especially effective in environments where protection against heat and oxidative stress is crucial. Choose UniVOOK Chemical’s Antioxidant for a trusted solution that keeps your materials in top-notch condition, enhancing their longevity and performance.


Features: Antioxidant 618

  • Oxidative Protection: Effectively protects materials, such as polymers, plastics, and rubbers, by inhibiting oxidation processes that can lead to damage.
  • Extended Shelf Life: By preventing oxidative degradation, this antioxidant contributes to the extension of the shelf life of treated materials, promoting long-lasting durability.
  • Structural Integrity: The stabilizing properties of 618 help maintain the structural integrity of materials, reducing the risk of deterioration over time.
  • Versatile Application: Suitable for a wide range of industries, including polymer, plastic, and rubber sectors, making it a versatile solution for oxidative stabilization.
  • Effective Heat Protection: It is particularly effective in environments where materials are exposed to elevated temperatures, offering reliable heat stability and protection against thermal degradation.
  • Consistent Performance: UniVOOK Chemical ensures that antioxidant 618 delivers reliable and consistent performance, meeting the high standards of various industries.



Find more antioxidant solutions for your plastic and rubber industry: Antioxidant DLTDP

Antioxidant 618 appears as a white waxy flake solid, also known as pentaerythritol distearyl diphosphite, or pentaerythritol distearyl diphosphite.

Production process of antioxidant 618:

1- Pentaerythritol reacts with phosphorus trichloride to produce dichloropentaerythritol diphosphite, and dichloropentaerythritol diphosphite reacts with octadecyl alcohol to produce antioxidant 618;

2- By the ester reation between pentaerythritol and triphenyl phosphite to produces intermediates, and the intermediates are transesterified with octadecanol to produce antioxidant 618.

Features and Application
mark Antioxidant 618 is a phosphorus-containing high-temperature antioxidant with excellent performance: high effective phosphorus content and good transparency. Used in the production process of products like ABS, PS, HIPS, NBR, SBS, PP, PE, LLDPE, PVC, PC, PA, PET, UP, amide fiber, polyester fiber, adhesives, coatings, inks, etc;
mark Antioxidant 618 is used as antioxidant for the production of food packaging materials: polyethylene, polystyrene, polypropylene, ABS resin, ethylene-vinyl acetate copolymer, polyvinyl chloride and polycarbonate.
mark Food grade pentaerythritol dioctadecyl diphosphite can replace the antioxidant BHT in food production processes;
Health & Safety

For more details and safety recommendations regarding the use of the product, please consult our MSDS of Antioxidant 618 (cas no. 3806-34-6), or contact with our product manager.


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