Silicic Acid Esters | Silicates | Polysilicates | Orthosilicates | Silane Passivating Agents

SiSiB® PC5410

Tetramethoxysilane (TMOS) .
Synonym: Tetramethyl Orthosilicate

Countertype of Evonik DYNASIL M, Catylen D1100, ShinEtsu KBM-04

Chemical Structure


Silicon esters are silicon compounds that contain an oxygen bridge from silicon to an organic group, for example, Si-OR. SiSiB® PC5410, the methyl ester of orthosilicic acid, is a colorless, low-viscosity liquid. It is industrially the most important of the tetraalkyl silicates.

Typical Physical Properties

Chemical Name: Tetramethoxysilane
CAS No.: 681-84-5
EINECS No.: 211-656-4
Empirical Formula: C4H12O4Si
Molecular Weight: 152.22
Silica Content: 39%
Boiling Point: 122°C [760mmHg]
Flash Point: 26°C
Color and Appearance: Colorless transparent liquid
Density [25°C]: 1.032
Refractive Index [25°C]: 1.3688 [20°C]
Purity: Min.99.0% by GC


The tetraalkyl orthosilicates ( also called orthosilicic acid esters) most commonly used as starting materials for sol-gel.

Polysilicic acidesters are condensation products obtained by incomplete hydrolysis or orthosilicic acid esters. They are also be used as starting materials for the sol-gel process.

SiSiB® PC5410 is used as crosslinkers in silicone rubber systems. SiSiB® PC5410 is used as drying agents in sealing compositions. SiSiB® PC5410 is used as an important starting material for sol-gel processes.


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

Technical Library

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Download 2010 SiSiB® SILANE Catalogue