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

SiSiB® PC5430

Tetrapropoxysilane (TPOS) .
Synonym: Tetrapropyl Orthosilicate;
Tetrapropyl Silicate.

Countertype of Evonik DYNASIL P

Chemical Structure


Silicon esters are silicon compounds that contain an oxygen bridge from silicon to an organic group, for example, Si-OR.

Typical Physical Properties

Chemical Name: Tetra-n-propoxysilane
CAS No.: 682-01-9
EINECS No.: 211-659-0
Empirical Formula: C12H28O4Si
Molecular Weight: 264.43
Silica Content: 22.7%
Boiling Point: 225°C [760mmHg]
Flash Point: 95°C
Color and Appearance: Colorless transparent liquid
Density [25°C]: 0.916
Refractive Index [25°C]: 1.401 [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.


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