Description

Methylenebis(3-Mercaptopropionic Acid) CAS NO 4265-57-0 is a high-purity, sulfur-containing organic compound featuring two terminal thiol (-SH) groups. This unique 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 rely on this specialty chemical include polymer science for high-performance materials, advanced adhesives and sealants, and pharmaceutical intermediate synthesis.

Application

• Polymer Cross-linking Agent: Used in the synthesis of thiol-ene polymers, polyurethanes, and epoxy resins to enhance thermal stability, mechanical strength, and chemical resistance.
• Chain Transfer Agent (CTA): Controls molecular weight and polydispersity in radical polymerizations, enabling the production of polymers with tailored properties.
• Intermediate for Pharmaceutical Synthesis: Serves as a key building block for creating drug candidates and active pharmaceutical ingredients (APIs) with specific disulfide or thioether linkages.
• Adhesive and Sealant Formulation: Imparts improved flexibility, adhesion, and durability in high-performance industrial and construction adhesives.
• Surface Modification and Functionalization: Used to introduce thiol groups onto surfaces or polymers for subsequent conjugation or to alter surface properties.
• Lens and Optical Material Production: A critical component in the synthesis of high-refractive-index polymers used for optical lenses and devices.

Basic Information

Product Name	Methylenebis(3-Mercaptopropionic Acid)
CAS No.	4265-57-0
Molecular Formula	C9H14O4S2
Molecular Weight	250.33 g/mol
Synonyms	2,2'-(Methylenedithio)diacetic Acid; 3,3'-Dithiodipropionic Acid, Methylene Derivative; Bis(3-mercaptopropionyl)methane; 2,2'-[Methylenebis(sulfanediyl)]diacetic Acid; Dithiodiglycolic Acid, Methylene Derivative; MBMPA; 1,1'-[Methylenebis(thio)]bis[propanoic acid]
EINECS	224-239-6

Quality Control

Our Methylenebis(3-Mercaptopropionic Acid) is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay by titration, identification by FT-IR, and impurity profiling, to ensure it meets stringent specifications for purity and consistency. Certificates of Analysis (COA) documenting all test results are provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This product is easily oxidized; for long-term storage, it is recommended to keep the container under an inert atmosphere (e.g., nitrogen) to maintain purity and shelf life. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (Titration)	≥ 98.0 %
Melting Point	95 - 100 °C
Loss on Drying	≤ 0.5 %
Heavy Metals (as Pb)	≤ 10 ppm

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