Octadecyltrimethoxysilane

Octadecyltrimethoxysilane is an organosilicon compound with a highly distinctive molecular structure. One end of the molecule features a long "carbon chain tail" composed of 18 carbon atoms—resembling a flexible braid—which endows the compound with excellent hydrophobicity and lubricity, making it highly effective in various surface treatment applications. At the other end, three "oxygen bridges" are firmly bonded to the silicon atom. These oxygen bridges exhibit relatively high chemical reactivity, enabling the formation of stable chemical bonds with a wide range of materials, thereby enhancing adhesion and durability. Thanks to this unique dual-functional structure, octadecyltrimethoxysilane finds extensive applications in materials science and surface engineering.

Basic Information:

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Chemical Name: Octadecyltrimethoxysilane

● Synonyms: n-Octadecyltrimethoxysilane

● CAS Number: 3069-42-9

● EINECS Number: 221-339-2

● Molecular Weight: 374.67

● Molecular Formula: C₂₁H₄₆O₃Si

● Refractive Index (nD): 1.439

● Density (ρ20): 0.883 g/cm³

● Melting Point: 16°C

● Boiling Point: 302°C / 760 mmHg

● Flash Point (closed cup): 140°C

● Appearance: Colorless transparent liquid

● Purity: ≥98%

Chemical Structure:

Applications:

1. Used in the manufacturing of various cosmetics, detergents, lubricants, and cleaning agents;

2. Applied as dye solvents, lubricants, and corrosion inhibitors;

3. Used in the synthesis of polysiloxanes, serving as an additive in coatings, inks, and paints;

4. Employed as a surface modifier for silica separation materials (e.g., in high-performance liquid chromatography and column separation media).

Packaging and Storage:

Available in 20 kg cartons containing four 5 kg plastic pails; also in 200 kg PVF steel or plastic drums, and 1,000 kg IBC totes.

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