Reaxis®  C739P50 - Proprietary Water Soluble Bismuth Complex

REAXIS® C739P50 is a proprietary bismuth catalyst that is primarily used in polyurethane applications. REAXIS® C739P50 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® C739P50 is provided as a 50% active bismuth catalyst in 50% PEG. Its main use is in waterborne and solvent-borne formulations. REAXIS® C739P50 can be provided in a wide range of alternative diluents such as ethylene glycol and water and offered as REAXIS® C739E50 and REAXIS® C739W50, respectively. REAXIS® C739P50 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.

Request A Sample Download The Technical Data Sheet

Technical Information

  • Product Category Bismuth

  • Chemical Name Proprietary Water Soluble Bismuth Complex

Typical Specifications

Parameter Range
Bismuth Content (%) 19.0 - 21.0
Density (g/ml) 1.3 - 1.6
Color (Gardner Number) 12 Max
Viscosity (cP @ 20°C) 7000 max

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® C739P50 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® C739P50 is used in applications where toxicity (when compared with organotins), water solubility and shelf-life issues are primary priorities. 


Although REAXIS® C739P50 has a different chemical make-up compared to the traditional bismuth carboxylates, it does exhibit a similar, bismuth-like reactivity profile. One of the benefits this product brings is that the  Uuse of REAXIS® C739P50 as a polyurethane catalyst 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 the bismuth catalysts in general, REAXIS® C739P50 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® C739P50 will impart a longer polyol-side shelf-life compared to bismuth carboxylates. 

Package & Storage

  • 44 lb (20 kg) plastic pail

REAXIS® C739P50 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.

Reaxis R Logo

Question About Our Products?

Are you unsure of what you are looking for? We want to hear your story. Maybe we can become a part of it.

Speak With An Expert