Description

1,3-Bis(Triethoxysilylethyl)Tetramethyldisiloxane is a high-purity, bifunctional organosilicon compound, also known as a silane crosslinker, valued for its ability to form durable covalent bonds between organic polymers and inorganic substrates. Its core value proposition lies in enhancing adhesion, moisture resistance, and mechanical properties in composite materials and coatings. This product is essential for manufacturers in the silicone rubber, adhesives & sealants, and advanced materials industries seeking to improve product performance and longevity.

Application

• Silicone Rubber Crosslinking: A key component in peroxide-cured High Consistency Rubber (HCR) and Liquid Silicone Rubber (LSR) formulations to improve tear strength and compression set.
• Adhesive & Sealant Primers: Used as an adhesion promoter in primers for silicone and organic polymer-based sealants on glass, metal, and concrete surfaces.
• Filler Treatment: Enhances the dispersion and compatibility of inorganic fillers (e.g., silica, minerals) within silicone and organic polymer matrices.
• Hybrid Material Synthesis: Serves as a molecular building block (precursor) for creating organic-inorganic hybrid coatings and materials with tailored properties.
• Waterproofing Agents: Imparts excellent hydrophobic characteristics to textiles, stone, and construction materials.
• Electronics Encapsulation: Used in formulations for potting and encapsulating electronic components to provide environmental protection and stress relief.

Basic Information

Product Name	1,3-Bis(Triethoxysilylethyl)Tetramethyldisiloxane
CAS No.	117680-21-4
Molecular Formula	C20H50O7Si4
Molecular Weight	522.98 g/mol
Synonyms	Bis[3-(triethoxysilyl)propyl]tetramethyldisiloxane; 1,3-Bis(3-triethoxysilylpropyl)-1,1,3,3-tetramethyldisiloxane; Tetramethyldisiloxane, 1,3-bis[3-(triethoxysilyl)propyl]-; SIB1826.0 (common abbreviation); Silane crosslinker SCA-703; Dynasylan 6490 (trade name); 3-(Triethoxysilyl)propyl-terminated polydimethylsiloxane (oligomer); Bis(triethoxysilylpropyl) tetramethyldisiloxane
EINECS	Contact for details

Quality Control

Our 1,3-Bis(Triethoxysilylethyl)Tetramethyldisiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay by GC or NMR and impurity profiling, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing all relevant specifications are provided with every shipment. We can support compliance requirements for various industrial standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C/59-77°F). Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed after opening to prevent degradation from atmospheric moisture. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC or NMR)	≥ 95.0%
Refractive Index (n20/D)	1.410 - 1.420
Density (g/mL, 25°C)	0.98 - 1.02
Moisture (KF)	≤ 0.5%

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