Skip to content 
CAS 107-96-0 3-Mercaptopropionic acid
Overview
3-Mercaptopropionic acid (3-MPA, β-mercaptopropionic acid; CAS 107-96-0; C₃H₆O₂S, 106.14 g/mol) is a bifunctional thiol–carboxylic acid used as a nucleophile, reducing agent, chelating/surface-modifying ligand, and chain-transfer / thiol-ene crosslinker. It enables clean thiolation/thioesterification and disulfide chemistry, controls molecular weight in acrylic/styrenic polymerizations, improves adhesion/cure in UV-curable & epoxy systems, and serves as an additive in electroplating and nanoparticle/oxide surface functionalization.
Product Description
CAS 107-96-0 3-Mercaptopropionic acid
3-Mercaptopropionic acid (3-MPA, CAS 107-96-0, C₃H₆O₂S) is a bifunctional thiol–carboxylic acid featuring a highly nucleophilic –SH and acidic –COOH group that undergo clean thiolation/thioesterification, disulfide exchange, metal complexation, and thiol–ene crosslinking—enabling efficient preparation of thioesters/thiols, chain-transfer control in acrylic/styrenic polymerizations, and surface/electroplating applications in fine chemicals and materials processing. It supports mild, scalable operations with broad functional-group tolerance and is miscible with water and polar organics (e.g., alcohols, ketones, esters).
3-Mercaptopropionic Acid (3-MPA) — Product Specification
CAS: 107-96-0 | Formula: C3H6O2S | Molecular weight: 106.14 g/mol | Synonyms: β-Mercaptopropionic acid; 3-MPA
Identity & Form
| Product form | Colorless to pale-yellow liquid; strong characteristic odor |
|---|---|
| Solubility | Miscible with water and polar organics (alcohols, ketones, esters) |
| Main functions | Thiolation / thioesterification; reducing & chelating agent; chain-transfer and thiol–ene crosslinker |
| Documents | COA · TDS · SDS · DG documents |
Typical Specification — Neat (example)
| Assay (GC) | ≥ 99.0% |
|---|---|
| Color (APHA) | ≤ 50 |
| Water (Karl Fischer) | ≤ 0.20% (w/w) |
| Disulfides (as 3-MPA dimer) | ≤ 0.30% (w/w) |
| Organic impurities | ≤ 0.30% (w/w) |
| Heavy metals (as Pb) | ≤ 10 ppm |
| Appearance | Clear, colorless to pale-yellow; free from visible particulates |
Typical Specification — 70% Aqueous Solution (example)
| Assay (as 3-MPA) | 70.0% ± 1.0% (w/w) |
|---|---|
| Free acidity (as H2SO4 eq.) | ≤ 0.30% (w/w) |
| Iron (Fe) | ≤ 5 ppm |
| Color (APHA) | ≤ 60 |
| Appearance | Clear to slightly hazy, pale-yellow liquid |
Applications & Handling
| Main uses | Thiol introduction / thioester formation; chain-transfer in acrylics/styrenics; thiol–ene crosslinking; metal complexation for plating & surface treatment |
|---|---|
| Handling | Corrosive and oxidation-sensitive. Avoid strong oxidants and strong acids/bases (risk of H2S or disulfide formation). Ensure good ventilation and appropriate PPE per SDS. |
| Storage | Tightly closed, cool, dry; preferably under inert atmosphere; keep away from oxidants and reactive metals. |
Packaging & Logistics
| Packaging | 1 L / 5 L / 25 L bottles or drums; 200 L drums; 1000 L IBC (solution grades) |
|---|---|
| Ports | Qingdao · Shanghai · Tianjin |
| To quote (please specify) | Grade (neat or solution %), pack size, destination country/port, and required documents |
© Shandong Yinglang Chemical CO.,LTD · Information for B2B technical marketing only.
PACKING AND DELIVERY
Packing and delivery
We offer secure and compliant packaging for a wide range of chemical products, from laboratory bottles (100 mL, 250 mL, 500 mL) to customized bulk containers. All shipments follow international hazardous goods standards and include complete documentation such as COA and SDS. With reliable global logistics partners, we ensure safe, fast, and efficient delivery by air, sea, or land according to customer needs.