WLK 10-Q Quarter ended June 30, 2010

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

For the quarterly period ended June 30, 2010

or

For the Transition Period from             to

Commission File No. 001-32260

Westlake Chemical Corporation

(Exact name of Registrant as specified in its charter)

2801 Post Oak Boulevard, Suite 600

Houston, Texas 77056

(Address of principal executive offices, including zip code)

(713) 960-9111

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ¨ No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes ¨ No x

The number of shares outstanding of the registrant’s sole class of common stock, as of July 29, 2010 was 66,136,615.

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WESTLAKE CHEMICAL CORPORATION

(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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WESTLAKE CHEMICAL CORPORATION

(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

1. Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2009 financial statements and notes thereto of Westlake Chemical Corporation (the “Company”) included in the annual report on Form 10-K for the fiscal year ended December 31, 2009, filed with the SEC on February 24, 2010. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2009.

In the opinion of the Company’s management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company’s financial position as of June 30, 2010, its results of operations for the three and six months ended June 30, 2010 and 2009 and the changes in its cash position for the six months ended June 30, 2010 and 2009.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the year ending December 31, 2010 or any other interim period. The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Recent Accounting Pronouncements

Accounting for Transfers of Financial Assets

In June 2009, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update on the accounting for transfers of financial assets. The new accounting guidance eliminates the qualifying special-purpose entity concept, introduces a new unit of account definition that must be met for transfers of portions of financial assets to be eligible for sale accounting, clarifies and changes the derecognition criteria for a transfer to be accounted for as a sale, changes the amount of recognized gain or loss on a transfer of financial assets accounted for as a sale when beneficial interests are received by the transferor and requires extensive new disclosures. The accounting standards update is effective for annual reporting periods beginning after November 15, 2009. The Company adopted the new guidance as of January 1, 2010, and it did not have a material impact on the Company’s consolidated financial position or results of operations.

Consolidation of Variable Interest Entities

In June 2009, the FASB issued an accounting standards update on the consolidation of variable interest entities. The new accounting guidance requires an analysis to determine who should consolidate a variable-interest entity, as well as when it would be necessary to reassess who should consolidate a variable-interest entity. The new guidance also eliminates the exemption for qualifying special purpose entities. The accounting standards update is effective for annual reporting periods beginning after November 15, 2009, with certain exceptions. The Company adopted the new guidance as of January 1, 2010, and it did not have a material impact on the Company’s consolidated financial position or results of operations.

Consolidation

In January 2010, the FASB issued an accounting standards update on the accounting and reporting for decreases in ownership of a subsidiary. The new accounting guidance clarified and broadened the scope for partial sales and deconsolidation events to include groups of assets that are businesses or are nonprofit activities and transfers of a business to a joint venture or to an equity method investee even when the transfer is in exchange for an interest in those entities. The new accounting guidance also requires additional disclosures on the deconsolidation of a subsidiary or derecognition of a group of assets within its scope. The accounting guidance was effective upon issuance. The Company has adopted the new guidance and it did not have an impact on the Company’s consolidated financial position or results of operations.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Fair Value Measurements

In January 2010, the FASB issued an accounting standards update on fair value measurement disclosures. The new accounting guidance requires disclosures on significant transfers in and out of Levels 1 and 2 of the fair value hierarchy and gross presentation of Level 3 reconciliation components. It also clarifies two existing disclosure requirements regarding fair value disclosures by class of assets and liabilities rather than by major category and disclosures of valuation technique and the inputs used in determining fair value of each class of assets and liabilities for Level 2 and 3 measurements. The accounting standards update is effective for reporting periods beginning after December 15, 2009, except for the gross presentation of the Level 3 reconciliation, which is effective for reporting periods beginning after December 15, 2010. With the exception of the gross presentation of the Level 3 reconciliation, the Company adopted the new guidance as of January 1, 2010, and it did not have an impact on the Company’s consolidated financial position or results of operations. The Company will adopt the new guidance pertaining to the gross presentation of the Level 3 reconciliation for the quarter ending March 31, 2011, but it is not expected to have a material impact on the Company’s consolidated financial position or results of operations.

Subsequent Events

In February 2010, the FASB issued an accounting standards update on subsequent events. The new accounting guidance removes the requirement for an SEC filer to disclose the date in both issued and revised financial statements through which it has evaluated subsequent events. Revised financial statements include financial statements revised as a result of either correction of an error or retrospective application of United States generally accepted accounting principles. The accounting guidance was effective upon issuance. The Company has adopted the new guidance and it did not have an impact on the Company’s consolidated financial position or results of operations.

2. Accounts Receivable

Accounts receivable consist of the following:

3. Inventories

Inventories consist of the following:

4. Property, Plant and Equipment

As of June 30, 2010, the Company had property, plant and equipment totaling $1,172,632. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Due to the negative impact of the economic downturn and continuing weakness in the construction markets on the demand for the Company’s downstream fabricated products, the Company assessed certain of its fabricated products assets for potential impairment in December 2009. At that time, the Company’s analysis concluded that these assets were not impaired. As the Company determined there had been no significant changes to the conditions or assumptions used in the December 2009 impairment analysis, the Company did not perform an impairment analysis in June 2010.

Depreciation expense on property, plant and equipment of $26,365 and $24,814 is included in cost of sales in the consolidated statements of operations for the three months ended June 30, 2010 and 2009, respectively, and of $52,556 and $48,875 is included for the six months ended June 30, 2010 and 2009, respectively.

5. Other Assets

Amortization expense on other assets of $6,123 and $6,468 is included in the consolidated statements of operations for the three months ended June 30, 2010 and 2009, respectively, and of $12,353 and $11,713 is included for the six months ended June 30, 2010 and 2009, respectively.

Long-term debt consists of the following:

The Company has a $400,000 senior secured revolving credit facility. As of June 30, 2010, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility would bear interest at either LIBOR plus a spread ranging from 2.75% to 3.50% or a base rate plus a spread ranging from 1.25% to 2.0%. The revolving credit facility also requires an unused commitment fee ranging from 0.75% to 0.875%, depending on the average daily borrowings. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 8, 2013. As of June 30, 2010, the Company had outstanding letters of credit totaling $21,579 and borrowing availability of $378,421 under the revolving credit facility.

7. Stock-Based Compensation

Under the Westlake Chemical Corporation 2004 Omnibus Incentive Plan (the “2004 Plan”), all employees and non-employee directors of the Company, as well as certain individuals who have agreed to become the Company’s employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2004 Plan. At the discretion of the administrator of the 2004 Plan, employees and non-employee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards or cash awards (any of which may be a performance award). Total stock-based compensation expense related to the 2004 Plan was $1,589 and $1,380 for the three months ended June 30, 2010 and 2009, respectively, and $2,979 and $2,689 for the six months ended June 30, 2010 and 2009, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Option activity and changes during the six months ended June 30, 2010 were as follows:

For options outstanding at June 30, 2010, the options had the following range of exercise prices:

The aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between the Company’s closing stock price on the last trading day of the quarter and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on June 30, 2010. This amount changes based on the fair market value of the Company’s common stock. The total intrinsic value of options exercised was $240 and $5 for the three months ended June 30, 2010 and 2009, respectively, and $404 and $6 for the six months ended June 30, 2010 and 2009, respectively.

As of June 30, 2010, $5,139 of total unrecognized compensation cost related to stock options is expected to be recognized over a weighted-average period of 2.1 years. Income tax benefit realized from the exercise of stock options was $50 and $2 for the three months ended June 30, 2010 and 2009, respectively, and $91 and $2 for the six months ended June 30, 2010 and 2009, respectively.

The Company uses the Black-Scholes option pricing model to value its options. The table below presents the weighted average value and assumptions used in determining the fair value for each option granted during the three months ended June 30, 2010 and six months ended June 30, 2010 and 2009. There were no options granted during the three months ended June 30, 2009. Volatility was calculated using historical trends of the Company’s common stock price.

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WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Non-vested restricted stock awards as of June 30, 2010 and changes during the six months ended June 30, 2010 were as follows:

As of June 30, 2010, there was $6,932 of unrecognized stock-based compensation expense related to non-vested restricted stock awards. This cost is expected to be recognized over a weighted-average period of 2.0 years. No restricted stock vested during the three months ended June 30, 2010 and 2009. The total fair value of shares of restricted stock that vested during the six months ended June 30, 2010 and 2009 was $1,186 and $83, respectively.

8. Derivative Commodity Instruments

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. Due to the short-term nature of the commodities and associated derivatives, the Company did not designate any of its commodity derivative instruments as hedges. As such, gains and losses from changes in the fair value of all the derivative instruments used in the three and six months ended June 30, 2010 and 2009 were included in earnings.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative securities (as such improvements would accrue to the benefit of the counterparty).

Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following table summarizes the classification of risk management assets and liabilities by fair value measurement level:

There were no transfers in and out of Levels 1 and 2 of the fair value hierarchy for the six months ended June 30, 2010.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The following tables reflect the fair values of derivative instruments in the Company’s consolidated balance sheets and the gain (loss) from trading activities in its consolidated statements of operations:

See Note 9 for the fair value of the Company’s derivative instruments.

9. Fair Value of Financial Instruments

The fair and carrying values of the Company’s derivative commodity instruments and financial instruments are summarized below:

10. Income Taxes

The effective income tax rate was 36.4% for the six months ended June 30, 2010. The effective 2010 period tax rate was above the statutory rate of 35.0% primarily due to state income taxes, partially offset by state tax credits and the domestic manufacturing deduction. The effective income tax rate was 50.3% for the six months ended June 30, 2009. The effective 2009 period tax rate was above the statutory rate of 35.0% primarily due to the decrease in the domestic manufacturing deduction caused by carrying back the year-to-date taxable loss and an increase in state income taxes.

There was a $1,389 reduction in the total gross unrecognized tax benefits for the six months ended June 30, 2010 related to the settlement of a tax issue with the tax authorities. Management anticipates no material reductions to the total amount of unrecognized tax benefits within the next twelve months.

The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. As of June 30, 2010, the Company had $173 of accrued interest and penalties related to uncertain tax positions.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2001. During the first quarter of 2010, the Internal Revenue Service completed the audit of the Company for the 2007 tax year with no assessment.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

11. Earnings per Share

There are no adjustments to “Net income” for the diluted earnings per share computations.

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

Excluded from the computation of diluted earnings per share are options to purchase 732,582 and 737,103 shares of common stock for the three months ended June 30, 2010 and 2009, respectively, and 693,855 and 737,103 shares of common stock for the six months ended June 30, 2010 and 2009, respectively. These options were outstanding during the periods reported but were excluded because the option exercise price was greater than the average market price of the shares.

12. Comprehensive Income Information

13. Pension and Post-Retirement Benefit Costs

Components of net periodic benefit cost are as follows:

The Company contributed $457 and $459 to the Salaried pension plan in the first six months of 2010 and 2009, respectively, and contributed $245 to the Wage pension plan in the first six months of 2010. There were no contributions to the Wage pension plan in the first six months of 2009. The Company expects to make additional contributions of $708 to the Salaried pension plan and $1,136 to the Wage pension plan during the fiscal year ending December 31, 2010.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

14. Commitments and Contingencies

The Company is subject to environmental laws and regulations that can impose civil and criminal sanctions and that may require it to mitigate the effects of contamination caused by the release or disposal of hazardous substances into the environment. Under one law, an owner or operator of property may be held strictly liable for remediating contamination without regard to whether that person caused the contamination, and without regard to whether the practices that resulted in the contamination were legal at the time they occurred. Because several of the Company’s production sites have a history of industrial use, it is impossible to predict precisely what effect these requirements will have on the Company.

Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation (“Goodrich”) chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company’s operations. The soil and groundwater at the complex, which does not include the Company’s nearby PVC facility, had been extensively contaminated by Goodrich’s operations. In 1993, Goodrich spun off the predecessor of PolyOne Corporation (“PolyOne”), and that predecessor assumed Goodrich’s indemnification obligations relating to preexisting contamination.

In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties, incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company’s provision to or on behalf of PolyOne of certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex do not have a specified termination date but are expected to last for the foreseeable future. The costs incurred by PolyOne to provide the environmental remediation services were $2,718 in 2009. On March 17, 2010, the Company received notice of PolyOne’s intention to commence an arbitration proceeding to readjust the percentage allocation of costs. The Company is not in a position at this time to state what effect, if any, the arbitration proceeding could have on the Company’s financial condition, results of operations or cash flows in 2010 and later years.

Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky Environmental and Public Protection Cabinet (the “Cabinet”) re-issued Goodrich’s Resource Conservation and Recovery Act (“RCRA”) permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich’s clean-up obligations under the permit to the Company.

In January 2004, the Cabinet notified the Company that the Company’s ownership of a closed landfill (known as former Pond 4) requires it to submit an application for its own permit under RCRA. This could require the Company to bear the cost of performing remediation work at former Pond 4 and adjacent areas at the complex. The Company challenged the Cabinet’s January 2004 order and has obtained several extensions to submit the required permit application. In October 2006, the Cabinet notified Goodrich and the Company that both were “operators” of former Pond 4 under RCRA, and ordered them to jointly submit an application for a RCRA permit. Goodrich and the Company have both challenged the Cabinet’s October 2006 order. On December 18, 2009, the Cabinet notified the Company that it has withdrawn the requirement for the Company to submit a permit application with regard to Pond 4.

All of these administrative proceedings have been consolidated, and the case is pending before the Cabinet.

Change in Regulatory Regime. On May 22, 2009, the Cabinet sent a letter to the U.S. Environmental Protection Agency (“EPA”) requesting the EPA’s assistance in addressing contamination at the Calvert City site under the U.S. Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”). In its response to the Cabinet on May 29, 2009, the EPA stated that it concurred with the Cabinet’s request and would incorporate work previously conducted under the Cabinet’s RCRA authority into the EPA’s cleanup efforts under CERCLA. Since 1983, the EPA has been addressing contamination at an abandoned landfill adjacent to the Company’s plant which had been operated by Goodrich and which was being remediated pursuant to CERCLA. During the past two years, the EPA has directed Goodrich and PolyOne to conduct additional investigation activities at the landfill and at the Company’s plant. On June 26, 2009, the EPA notified the Company that the Company may have potential liability under section 107(a) of CERCLA at its plant site. Liability under section 107(a) of CERCLA is strict and joint and several. The EPA specified a period of 60 days during which the Company could negotiate the performance and funding of response activities at the site. The EPA’s letter of June 26 also identified Goodrich and PolyOne, among others, as potentially responsible parties at the plant site.

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WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The Company negotiated, in conjunction with the other potentially responsible parties, an Administrative Settlement Agreement (“AOC”) and Order to conduct a remedial investigation and feasibility study (“RIFS”), which became effective on December 9, 2009. The parties submitted and received EPA approval for a RIFS work plan to implement the AOC. The parties are preparing to conduct the remedial investigation and feasibility study.

Litigation Related to the Administrative Proceedings. The Company has the contractual right to reconvey title to former Pond 4 back to Goodrich, and the Company has tendered former Pond 4 back to Goodrich under this provision. In March 2005, the Company sued Goodrich in the United States District Court for the Western District of Kentucky to require Goodrich to accept the tendered reconveyance and to indemnify the Company for costs the Company incurred in connection with former Pond 4. Goodrich subsequently filed a third-party complaint against PolyOne, seeking to hold PolyOne responsible for any of Goodrich’s former Pond 4 liabilities to the Company. Goodrich moved to dismiss the Company’s suit against it, the Company filed a motion for partial summary judgment against Goodrich, and PolyOne moved to dismiss Goodrich’s third-party complaint against it. In March 2007, the court granted Goodrich’s motion to dismiss the Company’s claim that Goodrich is required to accept the tendered reconveyance. On December 18, 2009, the Cabinet withdrew its request for a RCRA permit application for Pond 4. Thereafter, the parties agreed to dismiss the case without prejudice. The dismissal order was issued by the court on June 23, 2010.

Monetary Relief . Except as noted above, with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, none of the court, the Cabinet or the EPA has established any allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. The Company is not in a position at this time to state what effect, if any, the resolution of these proceedings could have on the Company’s financial condition, results of operations or cash flows in 2010 and later years. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

Environmental Investigations at Calvert City . In 2002, the National Enforcement Investigations Center (“NEIC”) of the EPA investigated the Company’s manufacturing complex in Calvert City. In early 2004, the NEIC investigated the Company’s nearby PVC plant. The EPA subsequently submitted information requests to the Company under the Clean Air Act and RCRA. The Company and the EPA met in 2004 to attempt to voluntarily resolve the notices of violation that were issued to the Company for the 2002 investigation and to voluntarily resolve any issues raised at the PVC plant in the 2004 investigation. Since then, the parties have continued to engage in settlement discussions. The EPA has indicated that it will impose monetary penalties and require plant modifications that will involve capital expenditures. The Company has recorded an accrual for a probable loss related to monetary penalties and other items to be expensed. Although the ultimate amount of liability is not ascertainable, the Company believes that the resolution of this matter will not have a material adverse effect on the Company’s financial condition, results of operations or cash flows.

EPA Audit of Ethylene Units in Lake Charles. During 2007, the EPA conducted an audit of the Company’s ethylene units in Lake Charles, Louisiana, with a focus on leak detection and repair, or LDAR. In January 2008, the U.S. Department of Justice, or DOJ, notified the Company that the EPA had referred the matter to the DOJ to bring a civil case against the Company alleging violations of various environmental laws and regulations. The DOJ informed the Company that it would seek monetary penalties and require the Company to implement an “enhanced LDAR” program for the ethylene units. The Company’s representatives met with the EPA in February 2008 to conduct initial settlement discussions. While the Company can offer no assurance as to an outcome, the Company believes that the resolution of this matter will not have a material adverse effect on the Company’s financial condition, results of operations or cash flows.

In addition to the matters described above, the Company is involved in various routine legal proceedings incidental to the conduct of its business. The Company does not believe that any of these routine legal proceedings will have a material adverse effect on its financial condition, results of operations or cash flows.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

15. Segment Information

The Company operates in two principal business segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

A reconciliation of total segment income (loss) from operations to consolidated income before income taxes is as follows:

16. Subsequent Events

In July 2010, the Louisiana Local Government Environmental Facility and Development Authority (the “Authority”), a political subdivision of the State of Louisiana, completed the reoffering of $100,000 of 6 ¹ / 2 % tax-exempt revenue bonds due August 1, 2029 under the Gulf Opportunity Zone Act of 2005 (the “GO Zone Act”). This reoffering follows the August 2009 issuance of $5,000 of floating rate tax-exempt revenue bonds due August 1, 2029 under the GO Zone Act, which were subsequently repurchased by the Company to be included as part of the $100,000 bond reoffering. In connection with the reoffering of the bonds, the Company entered into a loan agreement with the Authority under which the proceeds from the bond reoffering were lent by the Authority to the Company. To evidence and secure the Company’s obligations under the loan agreement, the Company entered into a third supplemental indenture, by and among the Company, the subsidiary guarantors party thereto and The Bank of New York Mellon Trust Company, N.A., as trustee, and issued $100,000 aggregate principal amount of the Company’s 6 ¹ / 2 % senior notes due 2029 to be held by the bond trustee pursuant to the terms and provisions of the loan agreement. The net proceeds from this reoffering, plus interest income, will remain with the trustee, and will be classified on the Company’s consolidated balance sheet as a non-current asset, restricted cash, until such time as the Company requests reimbursement of amounts used to expand, refurbish and maintain the Company’s facilities in Calcasieu and Ascension Parishes.

Subsequent events were evaluated through the date on which the financial statements were issued.

17. Guarantor Disclosures

The Company’s payment obligations under the Company’s 6 ⁵ / 8 % senior notes due 2016 and 6 ³ / 4 % senior notes due 2032 are fully and unconditionally guaranteed by each of its current and future domestic restricted subsidiaries that guarantee other debt of the Company or of another guarantor of the senior notes in excess of $5,000 (the “Guarantor Subsidiaries”). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation. These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the Guarantor Subsidiaries and the remaining subsidiaries that do not guarantee the senior notes (the “Non-Guarantor Subsidiaries”), together with consolidating adjustments necessary to present the Company’s results on a consolidated basis.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information as of June 30, 2010