Silane Coupling Agent

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Octadecyltriethoxysilane

Chemical Name:	Octadecyltriethoxysilane
Product Category:	Long-chain Silanes \| Silane Coupling Agent
Structural Formula:
CAS No.:	7399-00-0
EINECS:	230-017-1
Molecular Formula:	C₂₄H₅₂O₃Si
Molecular Weight:	416.76 g/mol
Appearance:	Colorless to light yellow liquid or solid

Octadecyltriethoxysilane Description

Octadecyltriethoxysilane (CAS 7399-00-0) is a silane coupling agent with the chemical formula C24H52O3Si. It appears as a colorless liquid with a density of approximately 0.87 g/cm³ and a melting point between 10-12°C. This compound is commonly used to modify surfaces, enhancing properties like hydrophobicity and adhesion in various applications.

Chemical Name	Octadecyltriethoxysilane
Synonyms	n-Octadecyltriethoxysilane, Stearyltriethoxysilane, Triethoxystearylsilane
Boiling Point	165°C at 2 mmHg
Density	0.87 g/mL at 20°C
Flash Point	195°C
Refractive Index (n²⁰/D)	1.4380 at 20°C
Solubility	Slightly soluble in chloroform and methanol; reacts slowly with moisture
Uses	Surface Modification: Octadecyltriethoxysilane is used to treat inorganic fillers, enhancing their hydrophobicity and improving compatibility with polymers, especially polyolefins. Hydrophobic Coatings: It serves as a precursor for creating self-assembled monolayers on substrates, imparting water-repellent properties to surfaces. Glass and Silica Functionalization: The compound is utilized for functionalizing glass and silica surfaces, which is beneficial in developing biosensors and microfluidic devices. Silicone Polymer Synthesis: Octadecyltriethoxysilane is involved in synthesizing silicone polymers valued for their thermal stability and mechanical strength.
Safety and Handling	Hazard Classification: Irritant (Xi) Risk Phrases: R36/37/38 – Irritating to eyes, respiratory system, and skin Safety Phrases: S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice; S36 – Wear suitable protective clothing
Packaging	Our standard packing is net 25kg / 200 kg drums / 1000kg/IBC，or according to your requirements.
Sample	Provided for free
Inventory items	7 tons
Price	Please contact us to get the new price.

Packaging Specifications

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Octadecyltriethoxysilane: Guide

Octadecyltriethoxysilane is a silane coupling agent featuring a hydrophobic octadecyl group and three ethoxy groups attached to a silicon atom. This structure enhances surface adhesion and imparts water-repellent properties.

Applications:

Coatings: Enhances adhesion and water resistance in paints and varnishes.
Adhesives & Sealants: Improves bonding strength between substrates.
Plastics & Polymers: Increases mechanical properties and weather resistance.
Rubber Industry: Enhances adhesion to various substrates, improving durability.

Safety Considerations:

Octadecyltriethoxysilane is moisture-sensitive and should be stored in a cool, dry place under inert gas. It may cause skin and eye irritation; appropriate protective measures are recommended during handling.