the compression hardness of this material is 4 9 kpa the number of cells per cm 17 u00b1 3 the thickness of the starting material is in this example 1 6 mm the thickness in the finished product 0 3 mm the third layer is preferably finished in a flame retardant manner a sheet like layer 4a consisting of a completely carbonized and activated woven viscose fabric is used as fourth layer in this example with a weight per unit area of 120 g 2 a thickness of 0 45 mm and a specific inner surface area of 1000 to 1200 m 2 g an adhesive layer 5a in the form of a hydrophilic adhesive coating polyurethane basis is laminated as fifth layer to the sheet like layer 4a namely with a weight per unit area of approximately 8 g m 2 a woven face fabric is applied as last layer in the form of a cover layer 6a and this can of course also be replaced by a weft knit or knitted textile layer in the present example a twill cloth is used 65 viscose 35 nomex with a weight per unit area of approximately 260 g m 2 by incorporating a suitable membrane in the structure of the filter material the protective properties of a protective clothing system made from the material as described can be considerably improved in relation to toxic chemical substances whilst ensuring an adequate water vapor permeability and so it is also possible to use such.