DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cable having a ceramic forming insulation layer in accordance with the invention; FIG. 2 is a perspective view of a multiconductor cable in which compositions of the invention are used as a sheath; FIG. 3 shows a possible design for a fire performance article 1; and and FIG. 4 shows a cross section at the position II in FIG. 3.