Exhibit 99.1

                            Explanation of Responses

(2) Mr. O'Malley directly owns 65 Class A membership units of PP Holding, LLC, a
Delaware limited liability company ("PPH"), representing approximately .05% of
the outstanding membership interests of PPH. On May 22, 2008, PPH distributed an
aggregate of 10,442,132 shares of Polypore International, Inc. Common Stock
("Common Stock") to its members (the "LLC Distribution"), including 4,791 shares
of Common Stock to Mr. O'Malley, which distribution was made on a pro rata basis
with no consideration being paid to PPH in connection therewith. Following the
LLC Distribution, PPH directly owns 10,442,132 shares of Common Stock. Because
Mr. O'Malley is not a controlling member of PPH and because Mr. O'Malley does
not have or share investment control over the shares of the Issuer's common
stock owned by PPH, Mr. O'Malley has no pecuniary interest in such shares of the
Issuer's common stock within the meaning of Rule 16a-1(a)(2) under the
Securities Exchange Act of 1934.