Dynasylan® SILBOND® 50

Dynasylan® SILBOND® 50 is a clear, low-viscosity liquid that is one of the most concentrated forms of available silica, ranging from 45.0% to 47.0% (the Si content of Dynasylan® SILBOND® 50 is calculated as SiO₂).
Dynasylan® SILBOND® 50 is an ethyl polysilicate that is the partially hydrolyzed product of tetraethyl orthosilicate (TEOS). The partial hydrolysis of TEOS (Si[OEt]4) results in the conversion of ethoxy groups to hydroxyl groups forming silanols. Subsequent condensation of silanols will form siloxane bonds (-Si-O-Si-O-) and eventually cause the material to gel.
Dynasylan® SILBOND® 50 is often used as an intermediate, which is further hydrolyzed to produce a binder that can be used for many applications. This binder is used for inorganic zinc-rich primers, investment casting molds, cores and ceramic shapes, and coatings.

Typical Applications

Similar to Dynasylan® SILBOND® Condensed and Dynasylan® SILBOND® 40, Dynasylan® SILBOND® 50 is used to deposit silicic acid formed as a result of complete hydrolysis. The resulting silicic acid bonds well to many inorganic substrates, such as glass, ceramic, metal, fillers, pigments, and synthetic fibers. The deposition of a thin SiO₂ layer improves the chemical and thermal stability and mechanical properties.
Other applications are:
  • binder, especially for inorganic zinc-rich coatings or precision investment castings
  • encapsulant for hydroxyl poor fillers to enhance adhesion with functional silanes
  • crosslinker component in cold-curing silicone rubber systems
  • coupling agent/adhesion promoter between organic polymers and inorganic substrates (fillers, pigments, glass, metals surfaces, etc.)

Dynasylan® SILBOND® 50 can also used as starting material for sol-gel processes. It is usually used in conjunction with alkylsilanes (e.g. Dynasylan® MTES) organofunctional silanes and/or organic precursors (e.g. organic resins) to form siloxane networks. This makes it possible to obtain highly scratch-, abrasion-, and chemical-resistant coatings.
Dynasylan® SILBOND® 50 is immiscible with water, therefore hydrolysis requires a cosolvent as a solubilizer. Mineral acids and ammonia are suitable as catalysts.
Dynasylan® SILBOND® 50 or its hydrolysates are also the binder component for 1- and 2-pack inorganic zinc-rich coatings, for corrosion protection on steel, and for slurries used in precision investment castings.

Product Details

Technical Data Sheets

Further Information

Packaging:

Dynasylan® SILBOND® 50 products could be available in pails, drums, totes and tanker quantities.
Please ask for further details.

Shelf life:

In unopened container Dynasylan® SILBOND® 50 has a shelf life of min. 12 months from date of manufacture.