Reaxis®  C248DP - Dibutyltin Oxide/Plasticizer Blend

REAXIS® C248DP (Dibutyltin Oxide + Plasticizer) is a liquid version of dibutyltin oxide, also known as DBTO, which contains a high molecular weight phthalate-based plasticizer.  This variant of dibutyltin oxide contains 40% of the active tin content compared to the solid version of DBTO, REAXIS® C248. Other liquid versions of dibutyltin oxide using phthalates as the diluent include REAXIS® C248D and REAXIS® C248DN. Liquid versions of DBTO-based silanes include REAXIS® C248VM and REAXIS® C248T. Other liquid grades are available upon request.

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Technical Information

  • Product Category Organotin

  • Chemical Name Dibutyltin Oxide/Plasticizer Blend

  • CAS Number 818-08-6

Typical Specifications

Parameter Range
Tin Content (%) 20.0 - 23.0
Color (Gardner Number) 4 Max
Density (g/ml) 1.14 - 1.16
Viscosity (cP @ 20°C) 1000 - 3000

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • AICS (Australia) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes

  • NDSL (Canada) No

  • REACH (EU) No

  • KECI (South Korea) Yes


REAXIS® C248DP and its alternatives can be used as a homogenous tin catalyst in a wide spectrum of silicone applications including adhesives, sealants, and coatings. Silicone-based applications include: acetoxy-, ethoxy- and oxime-based Room Temperature Vulcanizing (RTV) adhesives and sealants, polyethylene crosslinked silanes (PEX), and select silane modified polymers (SMPs).  REAXIS® C248DP is commonly used with formulations based on SMP resins such as MS Polymer®.  REAXIS® C248DP is on a broad range of international regulatory lists and is thus an ideal candidate for global formulation development.


Given its high tin content, liquid form, small ligand, and good compatibility with a wide range of raw materials, REAXIS® C248DP tends to be a highly reactive catalyst across a broad range of silicone formulations. In regard to silicone reactions, REAXIS® C248DP, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. In addition to reactivity, REAXIS® C248DP is more hydrolytically stable toward condensation-generated moisture.  Reactivity-wise, REAXIS® C248D, REAXIS® C226, and REAXIS® C248DN would be similar. 

Package & Storage

  • 44 lb (20 kg) pails
  • 485 lb (220 kg) drums
  • 2425lb (1100kg) IBC

REAXIS® C248DP should be stored in the original packaging. 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.

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