<SEC-DOCUMENT>0001209191-18-025678.txt : 20180420
<SEC-HEADER>0001209191-18-025678.hdr.sgml : 20180420
<ACCEPTANCE-DATETIME>20180420142557
ACCESSION NUMBER:		0001209191-18-025678
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180418
FILED AS OF DATE:		20180420
DATE AS OF CHANGE:		20180420

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ANGEL STEPHEN F
		CENTRAL INDEX KEY:			0001190775

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-01687
		FILM NUMBER:		18766199

	MAIL ADDRESS:	
		STREET 1:		39 OLD RIDGEBURY ROAD
		CITY:			DANBURY
		STATE:			CT
		ZIP:			06810-5113

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PPG INDUSTRIES INC
		CENTRAL INDEX KEY:			0000079879
		STANDARD INDUSTRIAL CLASSIFICATION:	PAINTS, VARNISHES, LACQUERS, ENAMELS & ALLIED PRODUCTS [2851]
		IRS NUMBER:				250730780
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE PPG PL 40 EAST
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15272
		BUSINESS PHONE:		4124343131

	MAIL ADDRESS:	
		STREET 1:		ONE PPG PL 40 EAST
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15272

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PITTSBURGH PLATE GLASS CO
		DATE OF NAME CHANGE:	19681219
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-04-18</periodOfReport>

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    <issuer>
        <issuerCik>0000079879</issuerCik>
        <issuerName>PPG INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>PPG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001190775</rptOwnerCik>
            <rptOwnerName>ANGEL STEPHEN F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PRAXAIR, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>10 RIVERVIEW DRIVE</rptOwnerStreet2>
            <rptOwnerCity>DANBURY</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06810-6268</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
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            <transactionAmounts>
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                    <value>1274</value>
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                <transactionPricePerShare>
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                    <value>1227</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
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                <transactionCode>A</transactionCode>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>307.8256</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>109.64</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F3"/>
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                <footnoteId id="F3"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                    <value>307.8256</value>
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                <sharesOwnedFollowingTransaction>
                    <value>25588.3667</value>
                    <footnoteId id="F6"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Upon the vesting of restricted stock units on April 18, 2018, which were granted to the reporting person on April 20, 2017, the reporting person deferred the receipt of 1,274 shares of common stock and received instead 1,274 shares of phantom stock pursuant to the PPG Industries, Inc. Deferred Compensation Plan for Directors. As a result, the reporting person is reporting the conversion of restricted stock units relating to 1,274 shares of common stock in exchange for an equal number of shares in phantom stock.</footnote>
        <footnote id="F2">The security converts to common stock on a one-for-one basis.</footnote>
        <footnote id="F3">After termination of service as a Director of PPG Industries, Inc.</footnote>
        <footnote id="F4">Each restricted stock unit represents a contingent right to receive one share of PPG Common Stock.</footnote>
        <footnote id="F5">The restricted stock units vest on April 17, 2019.</footnote>
        <footnote id="F6">Total of all phantom stock units held by the reporting person in the PPG Industries, Inc. Deferred Compensation Plan for Directors.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Greg E. Gordon, Attorney-in-Fact for Stephen F. Angel</signatureName>
        <signatureDate>2018-04-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
