Patent ID: 8062411

Claim:
A gas pervious adsorptive filtering material having integrated particle- and aerosol-protection and having protective performance with regard to biological and/or chemical noxiants, the adsorptive filtering material having a multilayered construction, the multilayered construction comprising: a support layer; an adsorptive layer that is associated to and fixed to the support layer, wherein the adsorptive layer comprises discrete particles of activated carbon in granule form or spherical form and wherein the adsorptive layer is fixed to the support layer by means of an adhesive, the adhesive being applied such that not more than 50% of the surface of the support layer is covered with the adhesive; a covering layer disposed on that side of the adsorptive layer that is remote from the support layer; wherein the adsorptive filtering material is additionally equipped with a gas pervious particle- and aerosol-filtering layer; wherein the particle- and aerosol-filtering layer is an air-pervious nonwoven textile fabric having an areal weight in the range of from 1 to 100 g/m 2 and consisting of textile fibers and having pores bounded by the textile fibers; wherein the textile fabric has an average pore size of not more than 200 μm; and wherein the ratio of the average pore or mesh size to the average diameter of the textile fibers is in the range from 40 to 250.