a wire bonding capillary having an extended service life - time , the use of which results in bonds with improved and stable qualities . the capillary includes a polymeric film which is vapor phase polymerized on the out side of the capillary tip in which a threaded bond wire travels . the polymeric film prevents bond deterioration and capillary clogging by layers of contaminates which originate from the wire and the capillary manufacturing processes , and which would otherwise accumulate inside the bore and on the face of the tip of the capillary .