Overview
REAXIS® C216 (Dioctyltin Dilaurate), also commonly abbreviated as DOTL, has been one of the most commonly used octyl-based organotins as tin catalysts for polyurethane and silicone condensation reactions. REAXIS® C216 has been the traditional go-to replacement for its butyl analogue, REAXIS® C218 (Dibutyltin Dilaurate). Due to the recent EU regulatory classification of dioctyltin dilaurate as a “Substance of Very High Concern” (SVHC), there has been a demand for alternatives for butyl-based organotins typical either of an octyltin or inorganic tin nature.
Alternative products for DOTL would include other octyl derivatives such as REAXIS® C228 (Dioctyltin Diacetate), REAXIS® C318 (Dioctyltin Dineodecanote) or REAXIS® C314 (Dioctyltin bis-(2-ethylhexyl Maleate). Inorganic tin alternatives would include REAXIS® C125 (Stannous Neodecanoate) and REAXIS® C129 (Stannous Octoate). All the above-mentioned products are neat liquids with varying metal content and ligand make-up.
For more information on dioctyltin dilaurate, we invite you to read our technical bulletins on Iron Catalysts and Strategies for Improving Back-End Reactivity of Bismuth Carboxylate catalysts.
Technical Information
- Product Category Organotin
- Chemical Name Dioctyltin Dilaurate
- CAS Number 3648-18-8
Typical Specifications
| Parameter | Range |
|---|---|
| Tin Content (%) | 15.0 - 16.5 |
| Color (Gardner Number) | 3 Max |
| Density (g/ml) | 1.01 - 1.03 |
| Refractive Index (nD @20°C) | 1.470 - 1.480 |
International Regulatory Listings
- TSCA (US) Yes
- DSL (Canada) Yes
- REACH (EU) 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
Applications
REAXIS® C216 and its alternatives can be used as a homogeneous tin catalyst in a wide spectrum of polyurethane and silicone applications including adhesives and sealants, elastomers and plastics, and coatings. Silicone-based applications for dioctyltin dilaurate include: acetoxy-, ethoxy- and oxime-based Room Temperature Vulcanizing (RTV) adhesives and sealants, polyethylene crosslinked silanes (PEX), and select silane-modified polymers (SMPs). In regard to polyurethane applications, REAXIS® C216 can be used for most related applications including coatings, adhesives and sealants, elastomers, and foams.
Reactivity
The reactivity and raw material compatibility of REAXIS® C216 should be somewhat similar to its butyl tin analogue, REAXIS® C218. Due to the larger alkyl group and steric effects and lower active tin metal content (16% vs 18%), REAXIS® C216 is expected to be somewhat slower in reactivity compared to REAXIS® C218, although this would be highly formulation specific. This reactivity difference is evidenced both in polyurethane and silicone chemistries in general, across all applications. In regard to silicone reactions, REAXIS® C216, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. As a polyurethane catalyst, dioctyltin dilaurate will preferentially catalyze the urethane reaction and to a lesser extent the water reaction, thus acting as a polymerization/gelation catalyst.
Package & Storage
- 440 lb (200 kg) steel drum
- 44 lb (20 kg) plastic pail
REAXIS® C216 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.
Safety and Handling
Disclaimer
Hazard Classification (US SDS)
| Section | Hazard Class | Category | Hazard Statement |
|---|---|---|---|
| A.7 | reproductive toxicity | 1B | H360D |
| A.8 | specific target organ toxicity - single exposure | 2 | H371 |
| 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 | not relevant | not relevant | not relevant | |
| Transport Class | none | none | none | |
| Packing Group | not assigned | not assigned | not assigned | |
Primary Composition Substance(s)
- dioctyltin dilaurate
"*" indicates required fields
"*" indicates required fields
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.
