Profile: Polypore International, Inc. develops, manufactures and markets specialized polymer-based microporous membranes, which are used in separation and filtration processes. Our products and technologies target specialized applications & markets that require the removal or separation of various materials from liquids, with such materials ranging in size from microscopic to those visible to the human eye. We produce different types of membranes that function as separators in lead-acid batteries used in transportation and industrial applications and lithium batteries used in electronics applications.