Reaxis®  C739E50

REAXIS® C739E50 is a proprietary bismuth catalyst for polyurethane applications. REAXIS® C739E50 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® C739E50 is provided as a 50% active bismuth catalyst in 50% ethylene glycol. Its main use is in waterborne and solvent-borne formulations. REAXIS® C739E50 can be provided in a wide range of alternative diluents such as PEG and water and offered as REAXIS® C739P50 and REAXIS® C739W50, respectively. REAXIS® C739E50 is present on the US TSCA chemical inventory. 

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Technical Information

  • Product Category Bismuth

  • Chemical Name Proprietary Water Soluble Bismuth Complex

Typical Specifications

Parameter Range
Bismuth Content (%) 18.5 - 20.5
Color (Gardner Number) 12 Max
Density (g/ml) 1.2 - 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® C739E50 is a commonly used catalyst for in polyurethane applications. It is used in a wide range of polyurethane applications including uses as a catalyst for coatings, adhesives and sealants, elastomers, foams, and plastics. REAXIS® C739E50 is a catalyst for applications where toxicity (versus organotins), water solubility and shelf-life issues are primary priorities. 


Although REAXIS® C739E50 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® C739E50 as a catalyst for polyurethanes results in good overall reactivity. A well-balanced cure is achievable given the presence of both a low bismuth metal content and ligand characteristics. Thus, a balanced front-end/pot-life and back-end/ final cure reactivity profile can be achieved. Reactivity, especially in regard to back-end cure, is greatly improved with the addition of added and exothermically generated heat.  Typical of bismuth catalysts in general, REAXIS® C739E50 will catalyze most polyurethanes reactions and is somewhat similar in reactivity to tin-based catalysts as a catalyst for polyurethanes; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. In addition to its enhanced water stability, REAXIS® C739E50 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® C739E50 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

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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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