weight of 100 g m2 this fleece was coated with nanofibers using the electro spinning method the tension at the electrodes was 25 kv the coating solution used was a 10 percent by weight polystyrene solution polystyrene basf 160 kh in methyl ethyl ketone by adding estane u00ae 5702 f2 manufacturer lubrizol corp switzerland when carrying out the tests for manufacturing the filters coated with nanofibers different estane u00ae concentrations were used to examine more in detail the influence of estane u00ae concentrations no estane u00ae was used for coating the reference medium the added estane u00ae quantity 5702 f2 refers to the quantity of polystyrene used the coating speed was 4 m min this slow speed made it possible to observe the effects according to the invention very clearly cf page 11 and the average nanofiber coating obtained was 0 5 g m2 table 3 shows the influence of standard nanofibers i e non tpe modified and tpe modified nanofibers on the pressure drop and the nacl separation efficiency using a sample fleece coated with modified nanofibers unlike a fleece with standard nf coating the fleeces sheetware coated with the modified nanofibers show a significantly higher nacl separation efficiency compared with fleeces coated with standard nanofibers the contact surface for nanofibers is as already mentioned quite small for only the elevations of the structured media are covered with it web like effect when using such structured media minor forces e g winding or unwinding of the coated fleece can detach the nanofibers therefore measurements comparisons with sheetware make sense a studded c2 fleece medium area weight 120 g m2 manufacturer irema filter gmbh was coated each with standard nanofibers and with modified nanofibers this fleece was coated with nanofibers using.