Reaxis®  C214 - Dioctyltin bis-(isooctyl mercaptoacetate)

REAXIS® C214, Dioctyl bis-(isooctyl mercaptoacetate), also known as Dioctyl tin-S,S’-bis(isooctylmercaptoacetate), is an octyl-based dialkyl organotin with added functionality. REAXIS® C214 has the characteristic reactivity of a Sn (IV) organotin catalyst with improved upfront delay and improved hydrolytic stability due to the presence of a sulfur-based ligand. Used primarily in polyurethanes, REAXIS® C214 imparts more controlled reactivity versus standard metal carboxylates such as REAXIS® C218 (Dibutyltin Dilaurate), REAXIS® C216 (Dioctyltin Dilaurate), and REAXIS® C325 (Dimethyltin Dineodecanoate). Catalysts similar to REAXIS® C214 include REAXIS® C319 (Dibutyltin Mercaptide), REAXIS® C320 (Dioctyltin Mercaptide), REAXIS® C227 (Dibutyltin bis-(1-thioglycerol)), and its isomer, REAXIS® C416 (Dioctyltin bis-(2-Ethylhexyl Mercaptocetate)).

For more information, we invite you to read our technical bulletins on Iron Catalysts and Strategies for Improving Back-End Reactivity of Bismuth Carboxylate catalysts.

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Technical Information

  • Product Category Organotin

  • Chemical Name Dioctyltin bis-(isooctyl mercaptoacetate)

  • CAS Number 26401-97-8

Typical Specifications

Parameter Range
Tin Content (%) 14.5 - 16.0
Refractive Index (nD @20°C) 1.485 - 1.500
Color (Gardner Number) 5 Max
Density (g/ml) 1.045 - 1.070

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

  • PICCS (The Philippines) Yes

  • REACH (EU) No

  • NDSL (Canada) No


Unlike standard organotin carboxylates, sulfur-bearing organotins are primarily used as a catalyst for polyurethanes. Catalysts such REAXIS® C214 tend to be inactive in silicone and esterification related applications.   As the sulfur ligand acts as a blocking agent, thermal deblocking is required to initiate the back-end cure. Thus, catalysts such as REAXIS® C214 tend to perform best in adhesive, elastomer, and foam applications with adequate exotherms. For coatings applications, REAXIS® C214 can be used in baked cured systems in contrast to ambient cured systems. As an octyltin, REAXIS® C214 is a good alternative for replacement of butyl -based tins such as REAXIS® C319.


As is typical of most organotin and inorganic tin catalysts, the specific ligand contributes a major influence on overall reactivity. This is specifically highlighted in regard to sulfur -bearing ligands. In general, these sulfur ligands impart improved front-end delay and hydrolytic stability versus standard tin carboxylates. Standard ligands include thiols, mercaptides and mercaptoacetates. Reactivity, as defined by delay, thermal availability, hydrolytic stability, and final cure will depend on the specific ligand, tin content, alkyl group and, most importantly, other raw materials used in the specific polyurethane formulation. As REAXIS® C214 is a mercaptoacetate based catalyst, its delay should be more pronounced compared mercaptans such REAXIS® C319 and REAXIS® C320.In regard to the reactivity of the various urethane reactions, catalysts such as REAXIS® C214 will selectively catalyze the isocyanate-polyol reaction, with less of an effect on the water reaction.


Package & Storage

  • 44 lb (20 kg) plastic pails
  • 485lb (220 kg) steel drums

REAXIS® C214 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. Although more stable compared to organotin carboxylates, long-term contact with moisture could result in hydrolysis with the formation of tin oxide insolubles leading to deactivation of REAXIS® C214. 

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

Hazard Classification (US SDS)

Section Hazard Class Category Hazard Statement
A.10 acute toxicity (oral) 4 H302
A.9 specific target organ toxicity - repeated exposure 1 H372

Hazard Pictograms (US SDS)


Transportation Information (US SDS)

DOT IMDG ICAO Environment Hazard
UN Number not subject to transport regulations not subject to transport regulations not subject to transport regulations non-environmentally hazardous acc. to the dangerous goods regulations
UN Proper Shipping Name None None None
Transport Class None None None
Packing Group None None None

Primary Composition Substance(s)

  • dioctyltin bis(isooctyl mercaptoacetate)

Alternative Product(s) to Consider

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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