Ethylene Glycol Bis(3-mercaptopropionate) / EGDMP

Product Name	Ethylene Glycol Bis(3-mercaptopropionate) (EGDMP) (Dithiol Crosslinker / Thiol-Ene Curing Agent)
CAS NO.	22504-50-3
Formula & Weight	C8H14O4S2 (MW: 238.32 g/mol)
Chemical Structure
Technical Specifications	Appearance: Clear colorless to pale yellow liquid Assay (GC): ≥ 95.0% (Industrial Grade) Mercaptan Content (-SH): 26.5% - 28.0% Acid Value: ≤ 0.5 mg KOH/g Color (APHA): ≤ 40 Refractive Index (25°C): 1.518 - 1.522 Specific Gravity: 1.19 g/cm³
Key Performance & Applications	EGDMP facilitates Thiol-Ene "Click" Chemistry, solving critical issues in UV curing: Beats Oxygen Inhibition: Enables rapid surface curing in thin films and UV LED systems where oxygen normally stops the reaction. Optical Adhesives: Its high refractive index and clarity make it ideal for optical lens bonding and display assembly. Low Stress & Flexibility: Reduces volume shrinkage during polymerization, improving adhesion to difficult substrates (Glass/Metal). 3D Printing (LCD/DLP): Enhances print speed and toughness in photopolymer resins.
Packaging & Storage	Packaging: 200kg Plastic Drum / 25kg Pail. Handling: Product has characteristic thiol odor. Handle in well-ventilated areas. Store in a cool, dry place to prevent oxidation.

Enhance your Thiol-Ene system performance with these compatible monomers:

PETMP (4-SH)

For higher crosslink density and faster cure speed.

TMPTA

Standard acrylate monomer to react with EGDMP.

Photoinitiators

TPO / 1173 for optimal thiol-ene initiation.

Royalchem's EGDMP offers the perfect balance of flexibility and cure speed.
Request a Sample or TDS today to test in your formulation.

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