AKTIFIT AM is an activated SILFIT Z 91, produced by modifying the surface with amino functional silane. The by-products split off during the treatment reaction are largely removed during the production process which firmly attaches the silane to the filler surface. This helps minimize undesirable side effects, as they are potentially encountered with insitu mixing (direct addition of silane to the compound).

During vulcanization, the amino groups of AKTIFIT AM react in the presence of appropriate crosslinking agents with the polymer. In non crosslinked polymers, the amino groups of AKTIFIT AM in the presence of appropriate functional groups generate a strong interaction in the form of hydrogen bonds.