Reaxis®  C739W50 - Water Soluble Bismuth Complex

REAXIS® C739W50 is a proprietary bismuth catalyst that is primarily used in polyurethane applications. As a bismuth catalyst, REAXIS® C739W50 is unique in that it is both non-carboxylate and water soluble, which differentiates it from the more common bismuth carboxylates such as REAXIS® C716 (Bismuth Neodecanoate) and REAXIS® C3210 (Bismuth Octoate). REAXIS® C739W50 is provided as a 50% active bismuth catalyst in 50% water. Its main use is in waterborne formulation. REAXIS® C739W50 can be provided in a wide range of alternative non-aqueous diluents such as ethylene glycol and PEG, and can be offered as REAXIS® C739E50 and REAXIS® C739P50, respectively. REAXIS® C739W50 is present on the US TSCA chemical inventory. 

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

  • Chemical Name Water Soluble Bismuth Complex

Typical Specifications

Parameter Range
Bismuth Content (%) 18.5 - 20.5
Color (Gardner Number) 12 Max
Density (g/ml) 1.3 - 1.5

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) No

  • NDSL (Canada) No

  • REACH (EU) No

  • AICS (Australia) No

  • KECI (South Korea) No

  • IECSC (China) No

  • ENCS (Japan) No

  • TCSI (Taiwan) No

  • NZloC (New Zealand) No

  • PICCS (The Philippines) No


Like most bismuth-based products, REAXIS® C739W50 is commonly used in polyurethane applications. It is used in a wide range of polyurethane applications including coatings, adhesives and sealants, elastomers, foams, and plastics. REAXIS® C739W50 is used in applications where toxicity (when compared with organotins), water solubility and shelf-life issues are priorities. and are paramount. In addition to use as a polyurethane catalyst, REAXIS® C739W50 is ideal for water-based lubricant formulations.


Although REAXIS® C739W50 has a different chemical make-up compared to the traditional bismuth carboxylates, it does exhibit a similar, bismuth-like reactivity profile. The use of REAXIS® C739W50 as a polyurethane catalyst results in good overall reactivity. A well-balanced cure is achievable, given the presence of both a lower bismuth metal content and ligand characteristics. Thus, a balanced front-end/pot-life and back-end/ final cure reactivity profile can be achieved through the use of this bismuth catalyst. Reactivity, especially in regard to back-end cure, is greatly improved with the addition of added and exothermically generated heat. Typical of the bismuth catalysts in general, REAXIS® C739W50 will catalyze most polyurethanes reactions and is somewhat similar in reactivity to tin-based catalysts; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. In addition to its enhanced water stability, REAXIS® C739W50 will impart a longer polyol-side shelf-life compared to bismuth carboxylates.

Package & Storage

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

REAXIS® C739W50 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

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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