<?xml version="1.0" encoding="UTF-8"?>
<xbrli:xbrl xmlns:in-bse-fin="http://www.bseindia.com/xbrl/fin/2020-03-31/in-bse-fin" xmlns:in-bse-fin-roles="http://www.bseindia.com/xbrl/fin/2020-03-31/in-bse-fin-roles" xmlns:in-bse-fin-ent="http://www.bseindia.com/xbrl/fin/2020-03-31/in-bse-fin/in-bse-fin-ent" xmlns:in-bse-fin-type="http://www.bseindia.com/xbrl/fin/2020-03-31/in-bse-fin-types" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xl="http://www.xbrl.org/2003/XLink">
<link:schemaRef xlink:type="simple" xlink:href="Ind-AS_entry_point_2020-03-31.xsd"/>
<xbrli:context id="OneD"><xbrli:entity><xbrli:identifier scheme="http://www.nseindia.com/NSESymbol">STYRENIX</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2023-04-01</xbrli:startDate><xbrli:endDate>2023-06-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context id="OneOperatingExpenses01D"><xbrli:entity><xbrli:identifier scheme="http://www.nseindia.com/NSESymbol">STYRENIX</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2023-04-01</xbrli:startDate><xbrli:endDate>2023-06-30</xbrli:endDate></xbrli:period><xbrli:scenario><xbrldi:explicitMember dimension="in-bse-fin:DetailsOfOtherExpensesAxis">in-bse-fin:OneOperatingExpenses01Member</xbrldi:explicitMember></xbrli:scenario></xbrli:context>
<xbrli:context id="OneI"><xbrli:entity><xbrli:identifier scheme="http://www.nseindia.com/NSESymbol">STYRENIX</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:instant>2023-06-30</xbrli:instant></xbrli:period></xbrli:context>
<xbrli:unit id="INR"><xbrli:measure>iso4217:INR</xbrli:measure></xbrli:unit><xbrli:unit id="pure"><xbrli:measure>xbrli:pure</xbrli:measure></xbrli:unit><xbrli:unit id="shares"><xbrli:measure>xbrli:shares</xbrli:measure></xbrli:unit><xbrli:unit id="INRPerShare"><xbrli:divide><xbrli:unitNumerator><xbrli:measure>iso4217:INR</xbrli:measure></xbrli:unitNumerator><xbrli:unitDenominator><xbrli:measure>xbrli:shares</xbrli:measure></xbrli:unitDenominator></xbrli:divide></xbrli:unit>
<in-bse-fin:ScripCode contextRef="OneD">506222</in-bse-fin:ScripCode>
<in-bse-fin:Symbol contextRef="OneD">STYRENIX</in-bse-fin:Symbol>
<in-bse-fin:MSEISymbol contextRef="OneD">NOTLISTED</in-bse-fin:MSEISymbol>
<in-bse-fin:NameOfTheCompany contextRef="OneD">Styrenix Performance Materials Limited</in-bse-fin:NameOfTheCompany>
<in-bse-fin:ClassOfSecurity contextRef="OneD">Equity</in-bse-fin:ClassOfSecurity>
<in-bse-fin:DateOfStartOfFinancialYear contextRef="OneD">2023-04-01</in-bse-fin:DateOfStartOfFinancialYear>
<in-bse-fin:DateOfEndOfFinancialYear contextRef="OneD">2024-03-31</in-bse-fin:DateOfEndOfFinancialYear>
<in-bse-fin:DateOfBoardMeetingWhenFinancialResultsWereApproved contextRef="OneD">2023-08-10</in-bse-fin:DateOfBoardMeetingWhenFinancialResultsWereApproved>
<in-bse-fin:DateOnWhichPriorIntimationOfTheMeetingForConsideringFinancialResultsWasInformedToTheExchange contextRef="OneD">2023-07-31</in-bse-fin:DateOnWhichPriorIntimationOfTheMeetingForConsideringFinancialResultsWasInformedToTheExchange>
<in-bse-fin:DescriptionOfPresentationCurrency contextRef="OneD">INR</in-bse-fin:DescriptionOfPresentationCurrency>
<in-bse-fin:LevelOfRoundingUsedInFinancialStatements contextRef="OneD">Lakhs</in-bse-fin:LevelOfRoundingUsedInFinancialStatements>
<in-bse-fin:ReportingQuarter contextRef="OneD">First quarter</in-bse-fin:ReportingQuarter>
<in-bse-fin:StartTimeOfBoardMeeting contextRef="OneD">12:33:00</in-bse-fin:StartTimeOfBoardMeeting>
<in-bse-fin:EndTimeOfBoardMeeting contextRef="OneD">13:05:00</in-bse-fin:EndTimeOfBoardMeeting>
<in-bse-fin:DateOfStartOfBoardMeeting contextRef="OneD">2023-08-10</in-bse-fin:DateOfStartOfBoardMeeting>
<in-bse-fin:DateOfEndOfBoardMeeting contextRef="OneD">2023-08-10</in-bse-fin:DateOfEndOfBoardMeeting>
<in-bse-fin:DeclarationOfUnmodifiedOpinionOrStatementOnImpactOfAuditQualification contextRef="OneD">Not applicable</in-bse-fin:DeclarationOfUnmodifiedOpinionOrStatementOnImpactOfAuditQualification>
<in-bse-fin:IsCompanyReportingMultisegmentOrSingleSegment contextRef="OneD">Single segment</in-bse-fin:IsCompanyReportingMultisegmentOrSingleSegment>
<in-bse-fin:DescriptionOfSingleSegment contextRef="OneD">Engineering Polymers</in-bse-fin:DescriptionOfSingleSegment>
<in-bse-fin:DateOfStartOfReportingPeriod contextRef="OneD">2023-04-01</in-bse-fin:DateOfStartOfReportingPeriod>
<in-bse-fin:DateOfEndOfReportingPeriod contextRef="OneD">2023-06-30</in-bse-fin:DateOfEndOfReportingPeriod>
<in-bse-fin:WhetherResultsAreAuditedOrUnaudited contextRef="OneD">Unaudited</in-bse-fin:WhetherResultsAreAuditedOrUnaudited>
<in-bse-fin:NatureOfReportStandaloneConsolidated contextRef="OneD">Standalone</in-bse-fin:NatureOfReportStandaloneConsolidated>
<in-bse-fin:RevenueFromOperations contextRef="OneD" unitRef="INR" decimals="-5">5437756000.00</in-bse-fin:RevenueFromOperations>
<in-bse-fin:OtherIncome contextRef="OneD" unitRef="INR" decimals="-5">21121000.00</in-bse-fin:OtherIncome>
<in-bse-fin:Income contextRef="OneD" unitRef="INR" decimals="-5">5458877000.00</in-bse-fin:Income>
<in-bse-fin:CostOfMaterialsConsumed contextRef="OneD" unitRef="INR" decimals="-5">4275489000.00</in-bse-fin:CostOfMaterialsConsumed>
<in-bse-fin:PurchasesOfStockInTrade contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:PurchasesOfStockInTrade>
<in-bse-fin:ChangesInInventoriesOfFinishedGoodsWorkInProgressAndStockInTrade contextRef="OneD" unitRef="INR" decimals="-5">-75350000.00</in-bse-fin:ChangesInInventoriesOfFinishedGoodsWorkInProgressAndStockInTrade>
<in-bse-fin:EmployeeBenefitExpense contextRef="OneD" unitRef="INR" decimals="-5">166481000.00</in-bse-fin:EmployeeBenefitExpense>
<in-bse-fin:FinanceCosts contextRef="OneD" unitRef="INR" decimals="-5">7433000.00</in-bse-fin:FinanceCosts>
<in-bse-fin:DepreciationDepletionAndAmortisationExpense contextRef="OneD" unitRef="INR" decimals="-5">91012000.00</in-bse-fin:DepreciationDepletionAndAmortisationExpense>
<in-bse-fin:OtherExpenses contextRef="OneD" unitRef="INR" decimals="-5">561664000.00</in-bse-fin:OtherExpenses>
<in-bse-fin:Expenses contextRef="OneD" unitRef="INR" decimals="-5">5026729000.00</in-bse-fin:Expenses>
<in-bse-fin:ProfitBeforeExceptionalItemsAndTax contextRef="OneD" unitRef="INR" decimals="-5">432148000.00</in-bse-fin:ProfitBeforeExceptionalItemsAndTax>
<in-bse-fin:ExceptionalItemsBeforeTax contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ExceptionalItemsBeforeTax>
<in-bse-fin:ProfitBeforeTax contextRef="OneD" unitRef="INR" decimals="-5">432148000.00</in-bse-fin:ProfitBeforeTax>
<in-bse-fin:CurrentTax contextRef="OneD" unitRef="INR" decimals="-5">113837000.00</in-bse-fin:CurrentTax>
<in-bse-fin:DeferredTax contextRef="OneD" unitRef="INR" decimals="-5">-6098000.00</in-bse-fin:DeferredTax>
<in-bse-fin:TaxExpense contextRef="OneD" unitRef="INR" decimals="-5">107739000.00</in-bse-fin:TaxExpense>
<in-bse-fin:NetMovementInRegulatoryDeferralAccountBalancesRelatedToProfitOrLossAndTheRelatedDeferredTaxMovement contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:NetMovementInRegulatoryDeferralAccountBalancesRelatedToProfitOrLossAndTheRelatedDeferredTaxMovement>
<in-bse-fin:ProfitLossForPeriodFromContinuingOperations contextRef="OneD" unitRef="INR" decimals="-5">324409000.00</in-bse-fin:ProfitLossForPeriodFromContinuingOperations>
<in-bse-fin:ProfitLossFromDiscontinuedOperationsBeforeTax contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ProfitLossFromDiscontinuedOperationsBeforeTax>
<in-bse-fin:TaxExpenseOfDiscontinuedOperations contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:TaxExpenseOfDiscontinuedOperations>
<in-bse-fin:ProfitLossFromDiscontinuedOperationsAfterTax contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ProfitLossFromDiscontinuedOperationsAfterTax>
<in-bse-fin:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod>
<in-bse-fin:ProfitLossForPeriod contextRef="OneD" unitRef="INR" decimals="-5">324409000.00</in-bse-fin:ProfitLossForPeriod>
<in-bse-fin:OtherComprehensiveIncomeNetOfTaxes contextRef="OneD" unitRef="INR" decimals="-5">1595000.00</in-bse-fin:OtherComprehensiveIncomeNetOfTaxes>
<in-bse-fin:ComprehensiveIncomeForThePeriod contextRef="OneD" unitRef="INR" decimals="-5">326004000.00</in-bse-fin:ComprehensiveIncomeForThePeriod>
<in-bse-fin:ComprehensiveIncomeForThePeriodAttributableToOwnersOfParent contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ComprehensiveIncomeForThePeriodAttributableToOwnersOfParent>
<in-bse-fin:ComprehensiveIncomeForThePeriodAttributableToOwnersOfParentNonControllingInterests contextRef="OneD" unitRef="INR" decimals="-5">0.00</in-bse-fin:ComprehensiveIncomeForThePeriodAttributableToOwnersOfParentNonControllingInterests>
<in-bse-fin:PaidUpValueOfEquityShareCapital contextRef="OneD" unitRef="INR" decimals="-5">175856000.00</in-bse-fin:PaidUpValueOfEquityShareCapital>
<in-bse-fin:FaceValueOfEquityShareCapital contextRef="OneD" unitRef="INRPerShare" decimals="INF">0</in-bse-fin:FaceValueOfEquityShareCapital>
<in-bse-fin:BasicEarningsLossPerShareFromContinuingOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">18.45</in-bse-fin:BasicEarningsLossPerShareFromContinuingOperations>
<in-bse-fin:DilutedEarningsLossPerShareFromContinuingOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">18.45</in-bse-fin:DilutedEarningsLossPerShareFromContinuingOperations>
<in-bse-fin:BasicEarningsLossPerShareFromDiscontinuedOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">0.00</in-bse-fin:BasicEarningsLossPerShareFromDiscontinuedOperations>
<in-bse-fin:DilutedEarningsLossPerShareFromDiscontinuedOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">0.00</in-bse-fin:DilutedEarningsLossPerShareFromDiscontinuedOperations>
<in-bse-fin:BasicEarningsLossPerShareFromContinuingAndDiscontinuedOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">18.45</in-bse-fin:BasicEarningsLossPerShareFromContinuingAndDiscontinuedOperations>
<in-bse-fin:DilutedEarningsLossPerShareFromContinuingAndDiscontinuedOperations contextRef="OneD" unitRef="INRPerShare" decimals="INF">18.45</in-bse-fin:DilutedEarningsLossPerShareFromContinuingAndDiscontinuedOperations>
<in-bse-fin:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock contextRef="OneD">1. The above statements were reviewed by the Audit Committee and approved by the Board of Directors of the Company at their respective meetings held on August 10, 2023. The statutory auditor have expressed unmodified conclusion on the aforesaid results.      2. The figures for the quarter ended March 31, 2023 are the balancing figures between audited figures in respect of the full financial year and the published year to date figures up to the third quarter of the respective financial year.      3. Hitherto up to the previous year, the Company had identified two business segments namely Polystyrene and Specialties whose separate operating results were regularly reviewed by the entity's chief operating decision maker (CODM) to make decisions about resources to be allocated to the segment and assess its performance. From the current quarter pursuant to internal restructuring, the CODM reviews the business as whole since the products of the company are all engineering polymers and do not result into identification of different ways/ sources into which the CODM sees the performance of the Company. Accordingly, from the current quarter, the Company has a single reportable segment namely 'Engineering Polymers . Hence, the disclosure requirements of Regulation 33 of the SEBI (Listing Obligations and Disclosure Requirements) Regulation, 2015 in terms of Ind AS 108  Operating Segments  are not applicable.      4. The financial results of the Company have been prepared in accordance with Indian Accounting ( Ind AS ) notified under Section 133 Of the Companies Act 2013 ('Act') read with Companies (Indian Accounting Standards) Rules, 2015, as amended.</in-bse-fin:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock>
<in-bse-fin:DescriptionOfOtherExpenses contextRef="OneOperatingExpenses01D">Other Expenses</in-bse-fin:DescriptionOfOtherExpenses>
<in-bse-fin:OtherExpenses contextRef="OneOperatingExpenses01D" unitRef="INR" decimals="-5">561664000.00</in-bse-fin:OtherExpenses>
<in-bse-fin:IncomeTaxRelatingToItmesThatWillNotBeReclassifiedToProfitOrLoss contextRef="OneD" unitRef="INR" decimals="-5">-2132000.00</in-bse-fin:IncomeTaxRelatingToItmesThatWillNotBeReclassifiedToProfitOrLoss>
<in-bse-fin:IncomeTaxRelatingToItmesThatWillBeReclassifiedToProfitOrLoss contextRef="OneD" unitRef="INR" decimals="-5">537000.00</in-bse-fin:IncomeTaxRelatingToItmesThatWillBeReclassifiedToProfitOrLoss>
</xbrli:xbrl>