Acetic acid is released as a by-product of
the reaction. Problems resulting from the acid can be overcome
using other cure (cross-linking) systems that have been
developed by replacing the acetoxysilane RSi(OAc)3 with
oximosilane RSi(ON=CR′
2)3 or alkoxysilane RSi(OR′)3.
Condensation curing is also used in some two-part systems
where cross-linking starts upon mixing the two components,
e.g., a hydroxy end-blocked polymer and an alkoxysilane such
as tetra-n-propoxysilane (Noll, 1968):