uniform or different thickness and or mass per unit area is stabilized mechanically thermally and or chemically and fixed in such a way that at least 10 and not more than 90 of the resulting consolidated fiber carrier consists of fiber bundles having a minimum number of 10 single fibers that adhere to one another in parallel and an open cell pore system that is openly accessible over the entire structure is formed the pore system contains a plurality of interconnected voids which are interconnected by transport channels in order to be able to transport powders and or liquids applied from the outside into the voids it is provided according to the invention to produce the product from a defined mixture of single finite fibers and finite fiber bundles to shape it to a surface or three dimensionally and then to fix it the proportion of fiber bundles used thereby determines to a significant degree the impregnability or the depth of penetration of highly viscous and pulverulent substances into the product layer the proportion of single fibers thereby determines to a significant degree the penetrability of storable liquids or powders the higher the proportion of fiber bundles in the structure the higher the proportion of larger voids with macropores and partially continuous channels the higher the proportion of single fibers in the structure the higher the proportion of smaller voids the voids are thereby interconnected by transport channels in order to be able to transport powders and or liquids or melts applied from the outside into the voids surprisingly it has been shown that the impregnability of such.