Benefos 1626

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Benefos 1626 (26741-53-7) is a phosphite type antioxidant of high phosphorous content.  This secondary antioxidant provides excellent heat stability and reduction in polymer degradation during processing.  Benefos 1626 has good synergism when used with light stabilizers such as benzophenones and benzotriazoles.


Chemical Name:                     Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite

CAS Number:                         26741-53-7

Chemical Structure:

Benefos 1626

Typical Properties         

Product Form:                       Solid

Melting Point:                        170 – 180oC

Molecular Weight:                  605 g/mol


Benefos 1626 is a highly effective processing stabilizer in polyolefins, including polyethylene polypropylene, as well as in olefin copolymers such as EVA. It is also recommended for use in other substrates such as PVC, engineering plastics, polyurethanes, styrenic polymers, elastomers, and adhesives.


  • Extends performance of primary antioxidants (i.e. BNX 1010 or BNX 1076)
  • Protects polymers from chain scission and cross-linking during melt processing
  • Prevents discoloration of polymers during melt processing
  • Improved long-term thermal stability
  • Synergism when used with light stabilizers such as benzophenones and benzotriazoles
  • FDA cleared for use in polyolefins, PVC, and polycarbonate

Guidelines for Use

Recommended loading concentrations range between 0.02% and 0.2% in polyolefins and between 0.05% and 0.25% in other substrates. Combinations of Benefos 1626 with phenolic primary antioxidants (BNX 1010, BNX 1076, and others) often show synergistic performance. Benefos 1626 is also suitable for use in combination with other antioxidants (for example thioethers) and light stabilizers, including hindered amine light stabilizers (HALS), UV absorbers, and benzoates. The exact formulation to be used is dependent on the substrate, performance requirements, and other factors, and should be determined by the user based on testing to simulate actual conditions of use. Please contact Mayzo for specific recommendations.


This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place. This product is moisture sensitive. Guard against exposure to humidity or moisture to maintain product quality. Opened containers should be used as soon as possible to avoid hydrolysis, especially during humid weather.


Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benefos 1626 is FDA cleared under 21 CFR §178.2010, including in olefin polymers, polyvinyl chloride and vinyl chloride copolymers, and polycarbonate resins. Please contact your Mayzo representative for complete details, including restrictions of use.

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