Description

Methylenebis(3-Mercaptopropionic Acid), 97% is a high-purity, sulfur-containing organic compound characterized by its two terminal thiol (-SH) groups. This structure makes it a versatile and highly reactive cross-linking agent and chain transfer agent in advanced polymer synthesis. It is essential for manufacturers requiring precise control over polymer architecture, molecular weight, and the introduction of reactive thiol functionalities. Key industries that utilize this material include specialty polymers, adhesives and sealants, and pharmaceutical intermediates.

Application

• Polymer Cross-linking Agent: Used in the synthesis of thiol-ene polymers, polyurethanes, and epoxy resins to enhance mechanical properties, thermal stability, and chemical resistance.
• Chain Transfer Agent (CTA): Controls molecular weight and polydispersity in radical polymerization processes for acrylics and other specialty polymers.
• Pharmaceutical Intermediate: Serves as a key building block for synthesizing active pharmaceutical ingredients (APIs) and drug delivery systems that incorporate disulfide bonds.
• Adhesive & Sealant Formulation: Imparts improved flexibility, adhesion, and curing characteristics in high-performance industrial and construction adhesives.
• Surface Modification: Used to create self-assembled monolayers (SAMs) or to functionalize surfaces (e.g., gold nanoparticles, polymers) with thiol groups for further conjugation.
• Lens & Optical Material Production: A critical monomer in the production of high-refractive-index optical resins and plastic lenses.

Basic Information

Item	Details
Product Name	Methylenebis(3-Mercaptopropionic Acid), 97%
CAS No.	20664-29-3
Molecular Formula	C7H12O4S2
Molecular Weight	224.30 g/mol
Synonyms	2,2'-(Methylenedithio)diacetic Acid; Bis(2-carboxyethylthio)methane; 3,3'-Dithiodipropionic Acid, Methyl Ester (related); MBMPA; Dithiobis(propanoic acid), methylene ester; 1,1'-[Methylenebis(thio)]bis[propanoic acid]; 3,3'-(Methylenedithio)dipropionic Acid
EINECS	243-941-6

Quality Control

Our production of Methylenebis(3-Mercaptopropionic Acid), 97% adheres to stringent quality protocols to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including HPLC for purity and titration for thiol content. We provide a detailed Certificate of Analysis (COA) with every shipment, documenting all critical specifications. Our quality management system supports compliance with relevant ISO and GMP guidelines where applicable.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at 15-25°C. This material is easily oxidized (store under inert atmosphere) and is compatible with strong acids and organic solvents. Keep away from heat, sparks, open flames, and strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Thiol Content (Titration)	≥ 95.0% of theoretical
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.