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
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
• Excellent Strength
• Light Weight
Product Details
Technical Data Sheets
Further Information
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