Description

3-Isocyanatopropyltriethoxysilane is a versatile organofunctional silane coupling agent characterized by its dual-reactive isocyanate and triethoxysilyl groups. This bifunctionality is critical for creating durable covalent bonds between inorganic substrates and organic polymers, significantly enhancing composite material performance. It is an essential raw material for manufacturers in the adhesives, sealants, coatings, and advanced composite materials industries seeking to improve adhesion, mechanical strength, and environmental resistance.

Application

• Adhesion Promoter: Primarily used to dramatically improve the adhesion of polyurethane, epoxy, and acrylic-based coatings, sealants, and adhesives to glass, metals, and mineral surfaces.
• Filler Treatment: Effective for surface modification of silica, glass fibers, and other mineral fillers to enhance compatibility and dispersion within polymer matrices, reducing viscosity and improving mechanical properties.
• Crosslinking Agent: Serves as a moisture-curable crosslinker in silicone-modified organic polymers, contributing to the formation of stable, three-dimensional networks.
• Composite Materials: Integral in the production of high-performance fiber-reinforced plastics (FRP) and rubber composites, where it strengthens the fiber-matrix interface.
• Waterproofing Agents: Used in formulations for stone, concrete, and masonry waterproofing treatments to provide long-lasting hydrophobic effects.
• Primers: A key component in primer formulations designed for difficult-to-bond substrates, ensuring reliable and durable bonds for subsequent layers.

Basic Information

Product Name	3-Isocyanatopropyltriethoxysilane
CAS No.	24801-88-5
Molecular Formula	C10H21NO4Si
Molecular Weight	247.36 g/mol
Synonyms	Triethoxy(3-isocyanatopropyl)silane; 3-(Triethoxysilyl)propyl isocyanate; Isocyanatopropyltriethoxysilane; Silane A-Link 35; Dynasylan CPTEO; GPTMOS; (3-Isocyanatopropyl)triethoxysilane; 3-Isocyanato-1-propanetriethoxysilane
EINECS	246-43-5

Quality Control

Our production of 3-Isocyanatopropyltriethoxysilane adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, purity, and identity confirmation, to ensure consistency and reliability. Certificates of Analysis (COA) documenting all key parameters are available upon request to support your quality assurance and regulatory needs.

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). Due to its moisture-sensitive (hygroscopic) and highly volatile nature, containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) after opening to prevent hydrolysis and polymerization. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Density (20°C)	1.00 - 1.02 g/cm³
Refractive Index (n20/D)	1.420 - 1.425

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