Dynasylan® SILBOND® 40

Dynasylan® SILBOND® 40 is a clear, low-viscosity liquid with a minimum silica content of 40.0% (the Si content of Dynasylan® SILBOND® 40 is calculated as SiO₂).
Dynasylan® SILBOND® 40 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® 40 is often used as an intermediate, which is further hydrolyzed to produce a binder that can be used for many applications. Several of these end-uses include inorganic zinc-rich primers, investment casting molds, cores and ceramic shapes, coatings, and thermal insulation.

Typical Applications

Similar to Dynasylan® SILBOND® Condensed, Dynasylan® SILBOND® 40 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 as Dynasylan® SILBOND® H- or HT- binders 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
  • hardening component in dentistry for impression materials and as a binder for embedding material

Dynasylan® SILBOND® 40 is 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® 40 is immiscible with water, therefore hydrolysis requires a cosolvent as a solubilizer. Mineral acids and ammonia are suitable as catalysts. Dynasylan® SILBOND® 40 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.

Benefits at a glance

• Known Technology
• Excellent Strength
• Light Weight

Product Details

Technical Data Sheets

Further Information

Packaging:

Dynasylan® SILBOND® 40 products could be available in pails, drums, totes and tanker quantities.
Please ask for further details.

Shelf life:

In unopened container Dynasylan® SILBOND® 40 has a shelf life of min. 24 months from date of manufacture.