Description

Bis(3-Triethoxysilylpropyl)Polyethylene Oxide(25-30Eo) is a specialized organosilane coupling agent featuring a hydrophilic polyethylene oxide (PEO) spacer chain. This bifunctional molecule is engineered to create durable covalent bridges between inorganic substrates and organic polymer matrices, significantly enhancing adhesion and compatibility. It is essential for formulators and material scientists in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as in advanced composites and surface modification technologies. CAS No. 666829-33-0.

Application

• As a key adhesion promoter in silane-modified polymers (SMPs) and hybrid sealants for construction and automotive applications.
• Surface modification of inorganic fillers (e.g., silica, glass, metals) to improve dispersion and interfacial bonding in polymer composites.
• Formulation of water-based coatings and inks to enhance substrate wetting, film formation, and durability.
• Improving the mechanical properties and hydrolytic stability of polyurethane and epoxy-based adhesives.
• As a compatibilizer in polymer blends and alloys to reduce interfacial tension and improve material homogeneity.
• Fabrication of biomedical and antifouling surfaces by leveraging the hydrophilic and protein-resistant nature of the PEO chain.

Basic Information

Product Name	Bis(3-Triethoxysilylpropyl)Polyethylene Oxide(25-30Eo)
CAS No.	666829-33-0
Molecular Formula	C~56-68H~118-138O~30-34Si2
Molecular Weight	~1300-1600 g/mol
Synonyms	Bis(3-triethoxysilylpropyl) PEG-25-30; Poly(ethylene glycol) bis(3-triethoxysilylpropyl) ether (25-30 EO); PEGylated bis-silane; α,ω-Bis(triethoxysilylpropyl) polyoxyethylene; Silane coupling agent with PEO spacer; 3-[2-[3-(Triethoxysilyl)propoxy]ethoxy]ethoxypropyl]triethoxysilane (mixture); Hydrophilic organosilane; PEO-bis-silane
EINECS	Contact for details

Quality Control

Our Bis(3-Triethoxysilylpropyl)Polyethylene Oxide(25-30Eo) is manufactured under a stringent quality management system. Each batch is analyzed to ensure consistent performance, with key parameters including silane content, ethylene oxide unit count, and purity monitored. Certificates of Analysis (COA) detailing specific results are provided with every shipment to guarantee traceability and compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C/59-77°F). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed after opening to prevent hydrolysis and maintain efficacy. Keep away from strong acids and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms
Assay (Silane Content)	≥ 95.0%
Ethylene Oxide Units (n, avg.)	25 - 30
Refractive Index (n20D)	1.445 - 1.455
Density (g/mL, 25°C)	1.05 - 1.10
Water Content (KF)	≤ 0.5%

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