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


SiSiB® PC5430, [also called n-Propyl Silicate] is used as a cross-linking agent for silicon rubber, and as a modifying agent for organic and inorganic resins. The ethyl group of ethyl silicate is replaced by the N-propyl group, so the speed of hydrolysis is slower than ethyl silicate.

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: 22.5%
Boiling Point: 225°C [760mmHg]
Flash Point: 98°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


SiSiB® PC5430 may be used as an inorganic binder for refractory fillers and pigments, like precision investment castings.

SiSiB® PC5430 may be used as a second backup casting coating. It cures faster than colloidal silica system.

SiSiB® PC5430 may be hydrolyzed to form silicon dioxide (silica).

SiSiB® PC5430 may be used as a binder in zinc-rich (corrosion resistant) coating.

SiSiB® PC5430 may be used as a starting material for sol-gel process.

SiSiB® PC5430 may be used as a crosslinking agent for silicone sealant.

SiSiB® PC5430 may be used as a drying agent in sealing compositions.

SiSiB® PC5430 may be used as a chemical intermediate.


Net weight 180Kg steel drum or 900Kg IBC container, for more details, please visit Packing Centre.

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