Butyl 3-mercaptopropionate
CAS 16215-21-7
EC 240-343-5
Formula C7H14O2S
MW 162.25 g/mol
Monomers & Building Blocks Plastics & PolymersLubricants & Metalworking Polymerization InitiationLubrication
Description
Butyl 3-mercaptopropionate (CAS 16215-21-7, EC 240-343-5), also referenced as butyl 3-mercaptopropanoate, n-butyl 3-mercaptopropionate, and NSC 54830, is a thiol-functional ester combining a mercaptopropionic acid backbone with a butyl ester group. It carries no assigned E-code and is classified within the monomers and building blocks category.
In polymer chemistry, the free thiol group acts as a chain-transfer agent and radical initiator, enabling controlled molecular weight distribution during polymerization of acrylates and other vinyl monomers. In lubricant formulations, the sulfur functionality provides boundary lubrication and mild EP activity, reducing metal-on-metal friction under load.
Butyl 3-mercaptopropionate is supplied as a technical-grade liquid and is registered under REACH for supply within the European Economic Area. Procurement teams should confirm SDS documentation, packing group classification, and available container sizes directly with the supplier, as packaging formats vary by volume requirement.
In polymer chemistry, the free thiol group acts as a chain-transfer agent and radical initiator, enabling controlled molecular weight distribution during polymerization of acrylates and other vinyl monomers. In lubricant formulations, the sulfur functionality provides boundary lubrication and mild EP activity, reducing metal-on-metal friction under load.
Butyl 3-mercaptopropionate is supplied as a technical-grade liquid and is registered under REACH for supply within the European Economic Area. Procurement teams should confirm SDS documentation, packing group classification, and available container sizes directly with the supplier, as packaging formats vary by volume requirement.
Physical Properties
| Boiling Point | 101 °C12 mm Hg(lit.) |
| Density | 0.999 g/mL at 25 °C(lit.) |
| Flash Point | 200 °F |
| Appearance | clear colorless to slightly yellow liquid |
| Water Solubility | 960mg/L at 22℃ |
| Vapor Pressure | 76.5Pa at 25℃ |
| Refractive Index | n 20/D 1.457(lit.) |
| Log P | 3.07 at 20℃ |
Safety & Handling (Learn More)
Warning GHS07 GHS09
H
H302H317H400H410
P
P261P264P270P272P273P280P321P330P391P501P301+P317P302+P352P333+P317P362+P364
Trade & Regulatory
| UN Number | 3334 |
| Storage Class | 10 - Combustible liquids |
| WGK (Germany) | 3 |
Other Names
Butyl 3-SulfanylpropanoateBUTYLMERCAPTOPROPIONATEButyl 3-mercaptopropanoateN-BUTYL 3-MERCAPTOPROPIONATE3-mercapto-propanoicacibutylester
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