124 STAT. 2439 PUBLIC LAW 111–227—AUG. 11, 2010 SEC. 1162. POROUS HOLLOW FIBERS. Subchapter II of chapter 99 is amended by inserting in numer- ical sequence the following new heading: ‘‘ 9902.40.75 Porous hollow fila- ments of perfluoroalkoxy (PFA) copolymer resin, the foregoing certified by the im- porter as having pore sizes of less than 0.05 microns and with a max- imum fiber diame- ter of 1 mm (pro- vided for in sub- heading 5404.19.80) Free No change No change On or be- fore 12/31/ 2012 .......... ’’. SEC. 1163. CELLULAR PLASTIC SHEETS FOR FILTERS. Subchapter II of chapter 99 is amended by inserting in numer- ical sequence the following new heading: ‘‘ 9902.40.76 Cellular plastic membrane sheets of polytetrafluoro- ethylene resin measuring 10 mi- crons to 140 mi- crons thick that, when tested, retain polystyrene latex beads of 0.15 mi- crons diameter; and cellular plastic membrane sheets of polysulfone resin of various thicknesses and porosity, each certified by the im- porter for use in manufacturing fil- ters of heading 8421 (provided for in sub- heading 3921.19.00) Free No change No change On or be- fore 12/31/ 2012 .......... ’’. SEC. 1164. CERTAIN WOVEN MESH FOR USE IN FILTERS. Subchapter II of chapter 99 is amended by inserting in numer- ical sequence the following new heading: