Patent ID: 8075669

Claim:
A venting apparatus having an opening for venting gas from an enclosure or receptacle, said venting apparatus including a porous gas-permeable venting composite comprising: (a) a porous polymeric structure having a structure defining a plurality of pores extending therethrough and with at least one outer surface; (b) a coating covering at least a portion of said outer surface of the porous polymeric structure, wherein the porous polymeric structure with the coating is porous and gas-permeable; (c) said coating comprising at least a first and a second component; (d) said first component comprising oleophobic and hydrophobic fluorinated material; and (e) said second component comprising a perfluoropolyether (PFPE), said PFPE comprising the following end-groups: —(O) n —(CR 1 R 2 ) m —CR 3 R 4 R 5 wherein: R 1 =H, F, Cl, Br or I; R 2 =H, F, Cl, Br or I; R 3 =H, F, Cl, Br or I; R 4 =H, F, Cl, Br or I; R 5 =H, F, Cl, Br, I, alkyl or aryl; n=0 or 1; and =0-10, wherein the weight ratio between the first and the second component in the formed coating is within the range of 1 weight part of the first component to 0.01-100 weight parts of the second component.