Crosslinker OX are oxime silane-based crosslinkers for producing neutral moisture-curing silicone sealants. Using these silane compounds, hydroxy-functionalized silicone polymers are crosslinked to obtain a silicone elastomer under the effect of a catalyst and moisture. When using Crosslinker OX, no acetic acid or amine is released in contrast to acid or alkaline crosslinking systems, but 2-butanone oxime. As this cleavage product reacts neutrally, sealing compounds based on Crosslinker OX can be used even on sensitive substrates such as marble. Application: Crosslinker OX is used in sealants, usually at concentrations of between 4 and 6 wt%. The various Crosslinker OX differ by their reactivity, with the general rule being: TOS > VOS > MOS Mixing different Crosslinker OX types enables setting the rate of a formulation precisely, i. e. skin-over time, curing rate and time to first elastic recovery. Information provided by Evonik |