Description

3-Chloropropyltriethoxysilane is a bifunctional organosilicon compound that serves as a critical coupling agent and surface modifier. Its molecular structure, featuring both a reactive chloro group and hydrolyzable ethoxysilane groups, enables it to form durable bonds between inorganic materials and organic polymers. This versatile silane is essential for manufacturers in the composites, adhesives, coatings, and electronics industries seeking to enhance material performance, adhesion, and durability.

Application

• Glass Fiber & Mineral Filler Treatment: A key coupling agent for fiberglass-reinforced plastics (FRP) and mineral-filled composites (e.g., talc, clay), improving mechanical strength and moisture resistance.
• Adhesive & Sealant Formulations: Used as an adhesion promoter in epoxy, polyurethane, and silicone-based systems, particularly for bonding to glass, metals, and concrete.
• Surface Modification of Nanoparticles: Functionalizes silica, alumina, and other inorganic nanoparticles to improve their dispersion and compatibility in polymer matrices.
• Silicone Rubber & Resin Intermediate: Acts as a crosslinking agent or a precursor for synthesizing modified silicone polymers with specific properties.
• Waterproofing & Protective Coatings: Imparts hydrophobic properties to concrete, masonry, and stone surfaces, enhancing durability against weathering.
• Electronics Encapsulation: Improves the adhesion and moisture resistance of epoxy molding compounds used to protect semiconductor devices.

Basic Information

Product Name	3-Chloropropyltriethoxysilane
CAS No.	5089-70-3
Molecular Formula	C9H21ClO3Si
Molecular Weight	240.80 g/mol
Synonyms	(3-Chloropropyl)triethoxysilane; Triethoxy(3-chloropropyl)silane; γ-Chloropropyltriethoxysilane; 3-Chloropropyltriethoxysilane; Chloropropyltriethoxysilane; Silane, (3-chloropropyl)triethoxy-; Dynasylan® CPTEO; A 143 (Silane Coupling Agent)
EINECS	225-789-8

Quality Control

Our 3-Chloropropyltriethoxysilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment. We support compliance with global regulatory frameworks, including REACH.

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). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent contact with atmospheric moisture, which can lead to hydrolysis and reduced efficacy.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Purity (GC)	≥ 97.0%
Refractive Index (n20/D)	1.420 - 1.425
Density (20°C)	1.00 - 1.02 g/mL

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