sil-cell is a multicellular, expanded vulcanic rock.
This filler belongs to the family of aluminium silicates and consists mainly of spherical ("
honeycomb structure") as well as rodshaped and flaky particles. Thus, bond strengths and packing densities are higher than in usual hollow microspheres.
The different sil-cell types distinguish themselves by grain sizes, grain spreading, bulk weight, and the effectual density.
There are both untreated and surface treated types available - the latter being extemely hydrophobic.