Reaxis®  C616 - Zinc Neodecanoate

REAXIS® C616 (Zinc Neodecanoate) is a commonly used zinc catalyst used in polyurethane applications. REAXIS® C616 utilizes neodecanoic acid as the ligand source and enhances compatibility with a wide range of polyurethane formulations. Related catalysts include REAXIS® C620, a zinc carboxylate based on an octanoic acid derived ligand. REAXIS® C616 and its components are present on a wide range of international regulatory lists, including US TSCA, EU REACH and Canadian DSL, making it a great choice for multinational formula development. We also offer this product blended with bismuth as REAXIS® C708.

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Technical Information

  • Product Category Zinc Carboxylate

  • Chemical Name Zinc Neodecanoate

  • CAS Number 27253-29-8

Typical Specifications

Parameter Range
Zinc Content (%) 17.5 - 19.0
Density (g/ml) 1.05 - 1.16
Viscosity (cP @ 20°C) 25,000 Max
Color (Gardner Number) 5 Max

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • REACH (EU) 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


REAXIS® C616 is primarily used in polyurethane elastomer and rigid foam applications.  REAXIS® C616 can also be used in polyurethane coating and adhesive applications. REAXIS® C616 is used in applications where toxicity concerns need to be mitigated, as it is a safer choice compared to organotins.  


Zinc carboxylates such as REAXIS® C616, 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 and thus urethane formation is poor. Thus, 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. Thus a mixed metal catalyst such as REAXIS® C708 is typically recommended, as the addition of a bismuth component enhances the overall reactivity. 

Package & Storage

  • 44 lb (20 kg) pails
  • 485 lb (220 kg) drums

REAXIS® C616 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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