Silane | Silanes | Alkyl & Alkoxy Silanes | Surface Modifier | Hydrophobing Agents | Water Repellent

SiSiB® PC5901

Synonym: Trimethoxy-octyl-silane

Countertype of Dynasylan OCTMO, DowCorning Z-6665

Chemical Structure


SiSiB® PC5901 is a monomeric medium-chain alkylfunctional silane. It is a clear colourless liquid and soluble in common non-polar organic solvent.

Typical Physical Properties

Chemical Name: n-Octyltrimethoxysilane
CAS No.: 3069-40-7
EINECS No.: 221-338-7
Empirical Formula: C11H26O3Si
Molecular Weight: 234.41
Boiling Point: 75°C [0.1mmHg]
Flash Point: 103°C
Color and Appearance: Colorless transparent liquid
Density [25°C]: 0.91
Refractive Index [25°C]: [25°C]
Purity: 98% by GC


SiSiB® PC5901 can be used as a surface modifier to generate hydrophobicity (e.g. on concrete, glass, inorganic pigments, or mineral fillers).

When diluted with an appropriate solvent, it can be used in the formulation of water repellent products. Upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the cementitious substrate. Treated substrates are hydrophobic and retain their original appearance.


Net weight 210L steel drum or 1000L IBC container, for more details, please visit Packing Centre.

Technical Library

Download Technical Data Sheet Safety Data Sheet


Download 2010 SiSiB® SILANE Catalogue