Reaxis®  C717 - Zinc/Bismuth Octoate Blend

REAXIS® C717 (Bismuth and Zinc Octoate) is a commonly used bismuth and zinc co-catalyst used in polyurethane applications. This combination of Bismuth and Zinc Octoate utilizes octanoic acid as the ligand source which enhances compatibility with a wide range of polyurethane formulations.  The unique reactivity of REAXIS® C717 is due to the two metal components, each offering different catalytic effects on the overall polyurethane reaction.  Zinc and Bismuth Octoate blends can, upon request, be provided with different ratios of bismuth and zinc, depending on the desired reactivity. Related catalysts would include REAXIS® C708, a zinc and bismuth catalyst based on a neodecanoic acid-based ligand; bismuth octoate product, REAXIS® C3210, and the zinc octoate product, REAXIS® C620. REAXIS® C717 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 bulletins on Novel Bismuth Complexes for Polyurethane Catalysis and Strategies for Improving Back-End Reactivity of Bismuth Carboxylate Catalysts.

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Technical Information

  • Product Category Bismuth and Zinc Carboxylate

  • Chemical Name Zinc/Bismuth Octoate Blend

  • CAS Number 67874-71-9 and 136-53-8

Typical Specifications

Parameter Range
Color (Gardner Number) 4 max
Density (g/ml) 1.10 - 1.30
Viscosity (cP @ 20°C) 2500 max


REAXIS® C717 is primarily used in polyurethane elastomer and rigid foam applications.  REAXIS® C717 can also be used in coating and adhesive applications. REAXIS® C717 is used in applications where toxicity concerns need to be mitigated, and serves as a potential replacement for commonly used sulfur functional organotins such as REAXIS® C319, REAXIS® C416 and REAXIS® C322.  In addition to being used as a polyurethane catalyst, REAXIS® C717 can be used in lubricant formulations


REAXIS® C717 provides a balanced reactivity in select polyurethane reactions.  In regard to polyurethane elastomers and foams, this balanced reactivity is achievable due to the presence of both a bismuth and zinc component.  Typical of bismuth carboxylates, the bismuth component is similar in reactivity to tin-based catalysts in that it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions, where the former reaction is key to the formation of the urethane groups. The zinc carboxylate component will preferentially catalyze the crosslinking reactions forming biurets and allophanates which leads to physical property enhancements such as hardness build. These zinc specific reactions usually require additional heat to be effective. These unique reactivity characteristics can be fine-tuned by adjusting the ratios of the bismuth and zinc components, or by using an alternative co-catalyst based on a different ligand, such as REAXIS® C708. Typically, REAXIS® C717 is a more active catalyst compared to its neodecanoic acid analogue due to the presence of a smaller ligand and a related higher metal concentration.  

Package & Storage

  • 44 lb (20 kg) plastic pail
  • 440 lb (200 kg) drums

REAXIS® C717 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. Characteristic of most Bismuth Carboxylates, the primary cause of instability would be hydrolysis.

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

Featured Technical Bulletins

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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