Reaxis®  C125 - Stannous Neodecanoate

REAXIS® C125 (Stannous Neodecanoate), also commonly known as Tin bis-(neodecanoate) or Tin Neodecanoate, is an inorganic tin carboxylate with a moderate metal content. REAXIS® C125 is an ideal candidate when looking for alternatives for organotins, such as REAXIS® C218 (Dibutyl Tin Dilaurate) and REAXIS® C248 (Dibutyl Tin Oxide), used as a homogenous catalyst in polyurethane, silicone, and esterification applications. Given its inorganic tin nature, REAXIS® C125 can be used in high-temperature specialty chemical applications. Tin Neodecanoate is typically supplied in a neat form with excess free acid typically in higher concentrations compared to REAXIS® C129 (Stannous Octoate). REAXIS® C125 is stable with various diluents including plasticizers, polyols, esters, and mineral oils.  Similar inorganic tin products would be REAXIS® C129, and REAXIS® C114 (Stannous Oleate).

For more information, read our technical bulletins on Bio-Based Catalysts and the Chemistry and Toxicity of Inorganic Tins.

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Technical Information

  • Product Category Inorganic Tin

  • Chemical Name Stannous Neodecanoate

  • CAS Number 49556-16-3

Typical Specifications

Parameter Range
Stannous Tin (%) 20.0 - 23.0
Viscosity (cP @ 20°C) 5000 Max
Turbidity (NTU) 30 Max
Color (Gardner Number) 8 Max

International Regulatory Listings

  • TSCA (US) Yes

  • NDSL (Canada) Yes

  • REACH (EU) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes


REAXIS® C125 is typically used in various catalysts applications.  REAXIS® C125 is used as homogeneous catalyst in polyurethane, silicone (condensation reaction) and esterification chemistries in a wide range of applications including lubricants, coatings, adhesives and sealants, elastomers, and foams


REAXIS® C125 is a good candidate for any of the mentioned chemistries and applications.  Similar to organotins, inorganics tins are more selective to NCO/OH reactions and are thus good gelation/polymerizations catalysts.  REAXIS® C125 has proven to be a viable replacement for other inorganic tin carboxylates such as REAXIS® C129 in a wide range of polyurethane applications.  For catalyzing silicone condensations, REAXIS® C125 exhibits faster reactivity, compared to REAXIS® C218 in select acetoxy- and alkoxy-based formulations. In regard to stability, inorganic tins like REAXIS® C125 do show a greater sensitivity to oxidation degradation compared to say organotins. This latter effect is due to the presence of the Sn(II) species present in all inorganic tin products.  Depending on the formulation, REAXIS® C125 can provide for increased hydrolytic stability compared to REAXIS® C129 due the presence of a larger ligand in the former product. 

Package & Storage

  • 55 lb (25 kg) plastic pail
  • 485 lb (220 kg) steel drum

REAXIS® C125 should be stored in the original packaging.  The container should be closed tightly after each use to maximize shelf life. Characteristic of most inorganic tins (Sn(II)), the primary cause of instability would be oxidation.

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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