AKTIFIT VM is an activated SILFIT Z 91, produced by modifying the surface with special vinyl 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).

A special process technology during production of AKTIFIT VM provides high hydrophobicity as well as outstanding low moisture absorption even under very humid conditions.

During the vulcanization the vinyl groups of the AKTIFIT VM react in the presence of radicals with the polymer.