A process for producing a functional film

The invention relates to a method for producing a functional layer (10), in particular a fuel cell functional layer, with at least one method step (12), in which at least one powder material (14) which for forming at least a part of a functional film element (16, 62) is provided with at least one first further powdery material (18) and with at least one second further powdery material (20) carried by the first further powdery material (18) substantially in at least its particle size distribution (24) is different (to a mixture of 38) is mixed, and (with at least one further process step 22), wird.Es in the sintered the mixture (38, 38a-g) is proposed that the first further powdered material (18) and the second further powdered material (20 ) are formed as a pore former.