Filtration article with heat-treated and shrunken fluoropolymer knit

A filtration article and method for filtering particles from a fluid stream are provided. The filtration article comprises a first layer, positionable across the fluid stream and comprising a porous PTFE membrane for fiitertng particles from the fluid stream; and a second layer, positionable across the fluid stream to provide for at least one of drainage of and support of the first layer, wherein the second layer has an aperture area of less than about 0.08 mm . 种用于过滤来自流体流的颗粒的过滤制品和方法，其包含：第层，可定位于穿过流体流，包含用于从流体流过滤颗粒的多孔PTFE膜；以及第二层，可定位于穿过流体流，以给第层提供支撑和排水中的至少个；其中，所述第二层具有低于约0.08mm的孔面积。