Butyl 3-mercaptopropionate
CAS Number
16215-21-7
EC Number
240-343-5
What is Butyl 3-mercaptopropionate?
Butyl 3-mercaptopropionate (CAS 16215-21-7) is a thiol-functional ester used as a reactive building block and performance additive in polymer chemistry and industrial lubrication.
Where is Butyl 3-mercaptopropionate used?
- Polymer systems: chain transfer agent and crosslinking co-monomer for molecular weight control and thiol-ene reactive sites
- Lubricants: sulfur-containing additive in metalworking fluids and gear oils that reduces friction and protects metal under extreme pressure
- Reactive intermediate for polythiol crosslinkers in fast-curing coatings and sealants
- Plastics compounding: processing stabilizer or co-agent improving compatibility between polymer phases
- Its free thiol group enables sulfur-based reaction mechanisms in polymerization and boundary lubrication.
Commercial specifications
- Commercial purity typically 95% or higher
- Packaging from laboratory quantities to drum scale
Other Names (Synonyms)
Propanoic acid, 3-mercapto-, butyl ester|butyl 3-mercaptopropanoate|Butyl mercaptopropionate|XC2PI7HKOE|beta-Mercaptopropionic acid, butyl ester|Propionic acid, 3-mercapto-, butyl ester
What are the physical properties of Butyl 3-mercaptopropionate?
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℃
How is Butyl 3-mercaptopropionate classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard
Hazard Statements
H302 Harmful if swallowed
H317 May cause an allergic skin reaction
H400 Very toxic to aquatic life
H410 Very toxic to aquatic life with long lasting effects
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P272 Contaminated work clothing should not be allowed out of the workplace.
Which trade and regulatory codes apply to Butyl 3-mercaptopropionate?
UN Number 3334
Storage Class 10 - Combustible liquids
WGK (Germany) 3