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


SiSiB® PC5410 can be used as an inorganic binder for refractory fillers and pigments, like precision investment castings.

SiSiB® PC5410 can be used as a second backup casting coating. It cures faster than colloidal silica system.

SiSiB® PC5410 can be hydrolyzed to form silicon dioxide (silica).

SiSiB® PC5410 can be used as a binder in zinc-rich (corrosion resistant) coating.

SiSiB® PC5410 can be used as a starting material for sol-gel process.

SiSiB® PC5410 can be used as a crosslinking agent for silicone sealant.

SiSiB® PC5410 can be used as a drying agent in sealing compositions.

SiSiB® PC5410 can be used as a chemical intermediate.

Compared to ethyl silicate, SiSiB® PC5411 has a higher silica concentration which brings cost advantages, but methyl alcohol is generated in the usage environment, so measures are necessary to counteract this.


Net weight 200Kg steel drum, for more details, please visit Packing Centre.

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