Reaxis®  C208 - Dioctyltin bis-(2-ethylhexanoate)

REAXIS® C208 (Dioctyltin Dioctoate) is a liquid octyltin that is primarily used as a homogenous catalyst for a wide range of polyurethane and silicone reactions. REAXIS® C208 is typically a slower-acting octyltin compared to the standard REAXIS® C216 (Dioctyltin Dilaurate) due to its reduced tin metal content. REAXIS® C208 is supplied with a diluent given its waxy nature. A wide variety of diluents can be used such esters, plasticizers, glycols, and silanes. Similar octyltin/carboxylate-based products would include REAXIS® C216, REAXIS® C228 (Dioctyltin Diacetate), REAXIS® C318 (Dioctyltin Dineodecanoate) and REAXIS® C314 (Dioctyltin bis-(2-Ethylhexyl Maleate).


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Technical Information

  • Product Category Organotin

  • Chemical Name Dioctyltin bis-(2-ethylhexanoate)

  • CAS Number 24577-34-2

Typical Specifications

Parameter Range
Tin Content (%) 9.0 - 11.0
Density (g/ml) 0.90 - 0.96
Color (Gardner Number) 3 Max

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • AICS (Australia) Yes

  • KECI (South Korea) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • NDSL (Canada) No

  • REACH (EU) No

  • PICCS (The Philippines) No


REAXIS® C208 will catalyze a wide range of polyurethane and silicone formulations, including adhesives and sealants, plastics & elastomers, and coatings. REAXIS® C208 is low in color and thus is ideal for coatings and sealant applications. Since REAXIS® C208 requires a diluent, the choice of diluent can be tailored to the specific end-use product, increasing formulation compatibility. For example, REAXIS® C208 can include various silane or plasticizer diluents thus making it a catalyst option for adhesives and sealants. REAXIS® C208 is a good alternative when toxicity considerations are critical, given its lower toxicity footprint compared to similar butyl-based and methyl-based organotins. If you’re unsure of which specialty chemical product is necessary for your application, please contact us and we’d be happy to point you in the right direction.



REAXIS® C208 is tin (IV) organotin and thus exhibits characteristic reactivity in both polyurethane and silicone reactions. In regard to polyurethanes, REAXIS® C208 would preferentially catalyze the urethane (NCO/OH or gelation) reaction but will also partially catalyze the water reaction. For silicones, REAXIS® C208 will catalyze most condensation-cured formulations where reactivity will be dependent on the silane functionality and silanol employed. REAXIS® C208, like most octyltins, will be slower than butyl-based and methyl-based organotins typically used in polyurethane and silicone reactions such as REAXIS® C218 (Dibutyltin Dilaurate), REAXIS® C233 (Dibutyltin Diacetate), and REAXIS® C325 (Dimethyl Dineodecanoate).  Reactivity can be enhanced with the choice of a formulation-compatible diluent. In addition to butyl-based and methyl-based organotins, inorganic tins such as REAXIS® C125 (Stannous Neodecanoate) and REAXIS® C129 (Stannous Octoate) would be good alternatives for the aforementioned applications and chemistries.


Package & Storage

  • 44 lb (20kg) Pails
  • 485lb (220kg) steel drums

REAXIS® C208 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 Sn (IV) organotins, the primary cause of instability would be hydrolysis. Hydrolysis results in the formation of tin oxide insolubles leading to deactivation of REAXIS® C208.


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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