| 主权项 |
1. Multilayer strip comprising:
an essentially mica-based layer; and an extruded polymeric layer comprising 60 to 85% by weight of a mineral filler and 15 to 40% by weight of a polymer, the mineral filler being selected from the group consisting of calcium carbonate, calcium sulphate, barium sulphate, aluminium silicate, hydrated aluminium silicate, alumina, aluminium hydroxide (ATH), magnesium, zinc oxide, mica, chalk, talc, titanium dioxide, silica, clay, kieselguhr, diatoms, dolomite and mixtures thereof, and the polymeric layer having a closed porosity between 40 and 75 percent by volume. |
