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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Hl/V8lBI7OeLYlCuh+dNNm0WMDUtNsQG7SmPx4WyyxxFu+bG901urrI5V63LPYpq
 kh07DzYdKj9fffV8vQbfKA==

<SEC-DOCUMENT>0001392917-08-000008.txt : 20081121
<SEC-HEADER>0001392917-08-000008.hdr.sgml : 20081121
<ACCEPTANCE-DATETIME>20081121145946
ACCESSION NUMBER:		0001392917-08-000008
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081119
FILED AS OF DATE:		20081121
DATE AS OF CHANGE:		20081121

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Polypore International, Inc.
		CENTRAL INDEX KEY:			0001292556
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS CHEMICAL PRODUCTS [2890]
		IRS NUMBER:				432049334
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(704) 588-5310

	MAIL ADDRESS:	
		STREET 1:		11430 N. COMMUNITY ROAD, SUITE 350
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Flynn Frederick C JR
		CENTRAL INDEX KEY:			0001347297

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32266
		FILM NUMBER:		081207132

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(704) 588-5310

	MAIL ADDRESS:	
		STREET 1:		C/O POLYPORE INTERNATIONAL, INC.
		STREET 2:		11430 N. COMMUNITY HOUSE ROAD, SUITE 350
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-11-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001292556</issuerCik>
        <issuerName>Polypore International, Inc.</issuerName>
        <issuerTradingSymbol>PPO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001347297</rptOwnerCik>
            <rptOwnerName>Flynn Frederick C JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O POLYPORE INTERNATIONAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11430 N. COMMUNITY HOUSE ROAD, SUITE 350</rptOwnerStreet2>
            <rptOwnerCity>CHARLOTTE</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28277</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2008-11-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5.75</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18959</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Mavis Gyamfi Huger, Attorney-In-Fact</signatureName>
        <signatureDate>2008-11-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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