-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Fi1RXUTaMlqKmEnexF+KzwhhoIWWMG2GhhO/plF4wc6du3d4HIj53jyjedE30vk+
 gdl+iVKGuzXldZRjLNAA3Q==

<SEC-DOCUMENT>0001200061-04-000010.txt : 20040512
<SEC-HEADER>0001200061-04-000010.hdr.sgml : 20040512
<ACCEPTANCE-DATETIME>20040512133521
ACCESSION NUMBER:		0001200061-04-000010
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040510
FILED AS OF DATE:		20040512

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WHITED CRAIG R
		CENTRAL INDEX KEY:			0001200062

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-06511
		FILM NUMBER:		04798651

	BUSINESS ADDRESS:	
		STREET 1:		O.I. CORP.
		STREET 2:		P.O.BOX 9010
		CITY:			COLLEGE STATION
		STATE:			TX
		ZIP:			77842-9010

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OI CORP
		CENTRAL INDEX KEY:			0000073773
		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
		IRS NUMBER:				730728053
		STATE OF INCORPORATION:			OK
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 9010
		STREET 2:		151 GRAHAM RD
		CITY:			COLLEGE STATION
		STATE:			TX
		ZIP:			778429010
		BUSINESS PHONE:		4096901711

	MAIL ADDRESS:	
		STREET 1:		151 GRAHAM RD
		STREET 2:		P O BOX 9010
		CITY:			COLLEGE STATION
		STATE:			TX
		ZIP:			77842-9010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OCEANOGRAPHY INTERNATIONAL CORP
		DATE OF NAME CHANGE:	19801205
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-05-10</periodOfReport>

    <issuer>
        <issuerCik>0000073773</issuerCik>
        <issuerName>OI CORP</issuerName>
        <issuerTradingSymbol>OICO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001200062</rptOwnerCik>
            <rptOwnerName>WHITED CRAIG R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>31145 PALOS VERDES DRIVE EAST</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>RANCHO PALOS VERDES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90275</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Director Stock Option - right to Buy</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.87</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-05-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2004-11-10</value>
            </exerciseDate>
            <expirationDate>
                <value>2007-05-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">No money was paid or received for this option</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Jane A. Smith - Attorney-in-Fact</signatureName>
        <signatureDate>2004-05-12</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----