Description

3-Glycidoxypropyl Heptamethyl Cyclotetrasiloxane is a specialized organosilicon compound featuring both epoxy and siloxane functional groups. This unique bifunctional structure makes it a highly versatile intermediate for modifying polymer surfaces and creating advanced hybrid materials. It is essential for manufacturers in the coatings, adhesives, and electronics industries seeking to enhance material properties such as adhesion, hydrophobicity, and thermal stability.

Application

• Surface Modification Agent: Used to functionalize inorganic fillers (e.g., silica, glass) to improve their compatibility and dispersion in epoxy, silicone, and other polymer matrices.
• Adhesion Promoter: Enhances the bond strength between organic polymers and inorganic substrates in coatings, sealants, and composite materials.
• Crosslinking Agent/Co-monomer: Incorporated into silicone resins and epoxy-siloxane hybrid polymers to tailor crosslink density, flexibility, and chemical resistance.
• Fiber Sizing: Applied as a coupling agent on glass or carbon fibers to improve the interfacial adhesion in reinforced plastics (FRP) and composites.
• Electronic Encapsulants: Serves as a key ingredient in formulations for potting and encapsulating electronic components, providing moisture protection and stress relief.
• Release Coatings: Used in the synthesis of silicone-based release liners for pressure-sensitive adhesives and industrial molding applications.

Basic Information

Item	Detail
Product Name	3-Glycidoxypropyl Heptamethyl Cyclotetrasiloxane
CAS No.	139052-13-4
Molecular Formula	C13H34O6Si5
Molecular Weight	458.89 g/mol
Synonyms	Glycidoxypropylheptamethylcyclotetrasiloxane; (3-Glycidoxypropyl)heptamethylcyclotetrasiloxane; Heptamethyl(3-glycidoxypropyl)cyclotetrasiloxane; Epoxy-functional cyclotetrasiloxane; Silane coupling agent, epoxy-functional; SCA-EP; D4E; ECPS-214
EINECS	Contact for details

Quality Control

We maintain stringent quality control protocols for our silane products. Each batch of 3-Glycidoxypropyl Heptamethyl Cyclotetrasiloxane is analyzed to ensure consistent purity, epoxy content, and functional performance. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with every shipment to support your quality assurance and R&D processes.

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). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent hydrolysis and maintain product integrity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Epoxy Value	Contact for details
Refractive Index (n20D)	1.405 - 1.415
Density (25°C)	1.00 - 1.05 g/mL
Water Content (KF)	≤ 0.1%

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