Reaxis®  C316 - Dimethyltin Dioleate (Dimethyl bis(oleoyloxy stannane)

REAXIS® C316 (Dimethyltin Dioleate) is a methyl-based Sn (IV) organotin that finds use mainly as a homogenous tin catalyst for polyurethanes. Similar products within the methyl-organotin family include REAXIS® C325 (Dimethyltin Dineodecanoate). As polyurethane catalysts, the methyl organotins are known for their relatively high reactivity owing mainly to the presence of the reduced steric methyl group. REAXIS® C316 is characterized by a relatively low viscosity resulting in efficient use and dosing across a variety of specialty chemical applications.


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Technical Information

  • Product Category Organotin

  • Chemical Name Dimethyltin Dioleate (Dimethyl bis(oleoyloxy stannane)

  • CAS Number 3865-34-7

Typical Specifications

Parameter Range
Tin Content (%) 15.0 - 17.0
Color (Gardner Number) 5 Max
Density (g/ml) 1.0 - 1.1
Viscosity (cP @ 20°C) <250
Chloride Content (%) 0.1% Max
Moisture (%) 1.0% Max

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • REACH (EU) Yes

  • AICS (Australia) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes

  • NDSL (Canada) No

  • KECI (South Korea) No


REAXIS® C316 is used primarily as a catalyst for polyurethanes. REAXIS® C316 can be used in formulations using aromatic isocyanates and thus is primarily used in adhesive, elastomer, and rigid foams applications. Catalysts which are used in similar applications include REAXIS® C125 (Stannous Neodecanoate), REAXIS® C3208 (Bismuth Neodecanoate), REAXIS® C233 (Dibutyltin Diacetate) and REAXIS® C325. If you’re not sure which of these would best suit your applications, please contact us for more information.



Typical of most metal-based catalysts, tin catalysts will preferentially catalyze the urethane reaction (NCO/OH or gelation reaction) as opposed to the water reaction. Methyl organotins are used for the relatively high reactivity compared to butyl- and octyl- organotins. Steric effects and compatibility with the raw materials on reactivity can be enhanced by inclusion with the ideal ligand. REAXIS® C316 includes a ligand based on oleic acid which will have an effect of slowing down the reactivity compared to the more reactive REAXIS® C325. REAXIS® C316 finds ideal use in applications that requires a more gradual reactivity build. Potential catalysts with similar reactivity would include REAXIS® C321 and REAXIS® C3200EXP (Iron Carboxylate).


Package & Storage

  • 20 kg (44lb) Pails
  • 200 kg (440lb) Drums

REAXIS® C316 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 the formation of tin oxide insolubles leading to deactivation of REAXIS® C316.


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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