AKTIFIT PF 115 is an activated SILFIT Z 91, produced by modifying the surface with a special 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).

A special process technology during production of AKTIFIT PF 115 provides high hydrophobicity as well as outstanding low moisture absorption even under very humid conditions. During vulcanization, the amino groups of AKTIFIT PF 115 react in the presence of appropriate crosslinking agents with the polymer. In non-crosslinked polymers, the amino groups of AKTIFIT PF 115 in the presence of appropriate functional groups generate a strong interaction in the form of hydrogen bonds.