Dynasylan® A
Dynasylan® A is the ethyl ester of orthosilicic acid.
In the literature it is frequently also referred to under the name TEOS (tetraethoxysilane). Dynasylan® A is a colourless, low-viscosity liquid with SiO₂ content of 28.5%. Use requires acid- or alkali-catalysed hydrolysis. Since all 4 ethoxy groups are able to participate in this reaction, Dynasylan® A is regarded as tetrafunctional. Hydrolysis leads to silanol groups which, in a subsequent condensation reaction, form very stable siloxane bonds (-Si-O-Si-). Condensation starts before hydrolysis is complete. During storage of these hydrolysates condensation continues until a gel is formed. The rate of gelation depends on the concentration of water.
Product information
Type
Binder
Sub type
Silane
Markets
Technologies
High solids (solventborne)
Solventborne
Solventfree
Manufacturer
Availability
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