Reaxis®  C620

REAXIS® C620 (Zinc Octoate), also commonly referred to as Zinc Ethylhexanoic Acid, is a commonly used zinc catalyst used in polyurethane applications. REAXIS® C620 utilizes octanoic acid as the ligand source and, like a neodecanoic- based ligand, enhances the compatibility with a wide range of polyurethane formulations.  Related catalysts would include REAXIS® C616, a zinc carboxylate based on an neodecanoic acid-derived ligand. REAXIS® C620 is provided as a co-catalyst with bismuth octoate as REAXIS® C717. REAXIS® C620 and its components are present on a wide range of international regulatory lists, including US TSCA and Canadian DSL.

For more information, we invite you to read our technical bulletin on Non-Tin Catalysts for Urethane Chemistries.

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Technical Information

  • Product Category Zinc Carboxylate

  • Chemical Name Zinc Octoate

  • CAS Number 136-53-8

Typical Specifications

Parameter Range
Zinc Content (%) 20.0 - 23.0
Color (Gardner Number) 5 Max
Density (g/ml) 1.1 - 1.2
Viscosity (cP @ 20°C) 5000 - 10000

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • AICS (Australia) Yes

  • KECI (South Korea) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes

  • NDSL (Canada) No

  • REACH (EU) No


REAXIS® C620 is primarily used as a catalyst in polyurethane elastomer and rigid foam applications as well as a lubricant additive.  REAXIS® C620 can also be used as a catalyst in polyurethane coating and adhesive applications. REAXIS® C620 can also be used in petrochemical and oil & gas applications to sequester hydrogen sulfide.  


Zinc carboxylates such as REAXIS® C620 will preferentially catalyze the common polyurethane crosslinking reactions forming biurets and allophanates. Zinc carboxylates are typically not very effective at catalyzing the polyol-isocyanate reaction, resulting in poor urethane formation. This is why zinc carboxylates are typically used in combination with an efficient urethane catalyst such as a bismuth carboxylate. Additionally, these zinc-specific crosslinking reactions usually require additional heat to be effective. Zinc/bismuth co-catalyst products include REAXIS® C708 and REAXIS® C717

Package & Storage


  • 440 lb (200 kg) drum


REAXIS® C620 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. 

Safety and Handling

Before use of Reaxis products please refer to the relevant Safety Data Sheet (SDS) for safety and toxicological data as well as for the information on proper transportation, storage, and use. SDSs are available by request via our web site, contacting your local representative, or emailing direct to

This information is provided to the best of our knowledge but without obligation. Reaxis is not liable for any incorrect or missing information. This data sheet becomes invalid upon publication of a new version. Please contact us for the latest version.

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