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Dynasylan® SILBOND® Condensed

1 of 42 products in this brand
Dynasylan® SILBOND® Condensed serves as a raw material composed of tetraethyl orthosilicate (TEOS; Si[OEt]4 ). This substance is utilized for acid- or alkali-catalyzed hydrolysis and subsequent condensation reactions, commonly known as the sol-gel process. The rate of gelation is influenced by the concentration of water and the pH.

Chemical Name: Tetraethyl orthosilicate

CAS Number: 78-10-4

Functions: Adhesion Promoter, Binder & Resin, Coupling Agent, Crosslinking Agent, Surface Modifier

Chemical Family: Silicates

Labeling Claims: Low VOC

Applicable Processes: Investment Casting

Synonyms: Ethyl Orthosilicate, Ethyl Silicate, Tetraethoxysilane, Tetraethyl Silicate

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Plastics & Elastomers Functions

Features & Benefits

Labeling Claims

Applications & Uses

Applicable Processes
Compatible Polymers & Resins
Plastics & Elastomers End Uses
Application Characteristics
  • Dynasylan® SILBOND® Condensed is a ready source of silicic acid for many applications. Silicic acid is usually obtained by hydrolysis, or thermally by condensation at elevated temperatures.
  • The resulting silicic acid bonds well to many inorganic substrates and can be deposited in-situ in a controlled manner.
  • The surfaces of glass, metals, pigments, fillers, and synthetic fibers can be coated withy a very thin SiO2 layer in order to improve chemical and thermal stability, and mechanical properties.
  • Other applications are:
  • binders for fillers in inorganic zinc-rich paints or precision investment castings
  • crosslinkers in silicone rubber systems
  • drying agents in sealing compositions
  • Dynasylan® SILBOND® Condensed is an important starting material for sol-gel processes, where the additional use of alkylalokoxysilanes (e.g. Dynasylan® MTES) can give the siloxane network a slight organic character as a result of the incorporation of alkyl groups.
  • It is also possible to construct an inorganic/organic network by adding silanes containing organofunctional groups (e.g. aminopropyl groups) and polymerizing with organic precursors.
  • This principle makes it possible to obtain highly scratch- and abrasion-resistant coatings.
  • Dynasylan® SILBOND® Condensed is immiscible with water, so hydrolysis requires the use of a co-solvent such as ethanol.
  • Suitable catalysts are mineral acids or ammonia, or even acetic acid and amines.
  • Partial hydrolysis gives hydrolysates of Dynasylan® SILBOND® Condensed whose shelf-life depends on the amount of water and solvent used.
  • The amount of water determines the activity of the hydrolysate.
  • Activity and shelf-life are inversely proportional.
  • The correct choice for the amount of water can give hydrolysates, which have a shelf-life of up to a year (from the time of manufacture).


Physical Form
Clear low - viscous liquid
Technical Data
ValueUnitsTest Method / Conditions
Density (at 20°C)0.930 - 0.940g/cm³QC07100P
Boiling Point167.0°C-
Viscosity (at 20°C)0.75mPa.s-
Flash Point46.0°C-
Silica Content (as SiO₂)min. 28.0% wtQC07106P
Purity (GC-TCD)min.96.5%QC07105P

Packaging & Availability

Packaging Information

Dynasylan® SILBOND® Condensed could be available in pails, drums, totes, and tanker quantities.

Storage & Handling

Shelf Life
24 months