UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

FORMSECURITIES 8-KAND EXCHANGE COMMISSION

CURRENTWashington, REPORTDC Pursuant to Section 13 OR 15(d) of the Securities Act of 193420549

DateFORM of Report: April 26, 2005 Date of Earliest Event Reported: April 25, 20058-K

Item 9.01 Financial Statements and Exhibits

~~Commission~~CURRENT ~~file number 1-6450~~REPORT

~~GREAT~~Pursuant ~~LAKES~~to ~~CHEMICAL~~Section ~~CORPORATION (Exact~~13 ~~name~~OR 15(d) of ~~registrant~~the asSecurities ~~specified~~Act inof ~~its charter)~~1934

DELAWARE		95-1765035
(State or other jurisdiction of incorporation or organization)		(IRS Employer Identification No.)

Date of Report: May 2, 2005

~~9025~~Date ~~NORTH RIVER ROAD, SUITE 400 INDIANAPOLIS, INDIANA 46240 (Address~~ of ~~principal~~Earliest Event ~~executive~~Reported: ~~offices)~~April ~~(Zip Code) Registrant’s telephone number~~29, ~~including area code 317-715-3000~~2005

Commission ~~Check~~file ~~the~~number ~~appropriate box below if the Form 8~~1-~~K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:~~6450

oGREAT ~~Written~~LAKES ~~communications~~CHEMICAL pursuant to Rule 425 under the Securities Act (17CFR 230.425) o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))CORPORATION

~~Item~~(Exact ~~2.02 Results~~name of registrant ~~Operations~~as ~~and~~specified ~~Financial~~in ~~Condition~~its charter)

The following information is being furnished pursuant to Item 2.02 and should not be deemed to be “filed” under the Securities Exchange Act of 1934.

DELAWARE		95-1765035
(State or other jurisdiction of incorporation or organization)		(IRS Employer Identification No.)

9025 NORTH RIVER ROAD, SUITE 400 INDIANAPOLIS, INDIANA 46240
(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code 317-715-3000

OnCheck ~~April~~the ~~25,~~appropriate ~~2005,~~box ~~Great~~below ~~Lakes~~if ~~Chemical Corporation issued a press release announcing first quarter 2005 results. A copy of this release has been included as Exhibit 99.1 under Item 9.01. In addition, on April 26, 2005,~~ the ~~company~~Form ~~will~~8-K ~~hold~~filing ais ~~teleconference~~intended ~~for analysts and media~~ to simultaneously ~~discuss~~satisfy the ~~first~~filing ~~quarter~~obligation ~~results. The~~of ~~teleconference~~the ~~will~~registrant beunder ~~web~~any ~~cast~~of on the following ~~company’s web site.~~provisions:

~~The~~o Written ~~press~~communications ~~release~~pursuant ~~attached~~to asRule 425 ~~Exhibit~~under ~~99.1~~the ~~contains~~Securities ~~non-GAAP~~Act ~~financial measures such as adjusted~~ (or17CFR ~~“underlying”) income (loss) from continuing operations, diluted earnings per share, operating income (loss) and free cash flow~~230.425)

~~Pursuant~~o Soliciting tomaterial ~~the~~pursuant ~~requirements~~to ~~of Regulation G, the company has provided, as part of the press release posted on its web site, a reconciliation of each non~~Rule 14a-~~GAAP~~12 ~~financial~~under ~~measure to~~ the ~~most~~Exchange ~~directly~~Act ~~comparable~~(17 ~~GAAP~~CFR ~~financial measure~~240.14a-12)

~~Management~~o Pre-commencement ~~believes~~communications ~~that reporting income measures excluding asset impairments, restructuring charges and certain other significant items provides useful insight~~ pursuant to ~~investors~~Rule by14d-2(b) ~~more~~under ~~clearly presenting~~ the ~~core~~Exchange ~~operations~~Act of(17 ~~Great~~CFR ~~Lakes Chemical Corporation~~240. This may help investors evaluate the company’s performance period over period and identify important operating trends that would be otherwise masked by the excluded items. These measures also permit investors to view the company’s performance using the same information that company management uses to evaluate the performance of the company’s various businesses, including the allocation of available resources.14d-2(b))

~~While~~o Pre-commencement ~~the~~communications ~~company~~pursuant to ~~believes~~Rule ~~that these non~~13e-~~GAAP~~4(c) ~~financial~~under ~~measures are useful in evaluating~~ the ~~company’s~~Exchange ~~financial~~Act ~~performance,~~(17 ~~investors~~CFR ~~should consider these non-GAAP measures in addition to, not as a substitute for, or as superior to, measures of financial performance prepared in accordance with GAAP~~240.13e-4(c))

Item 97.01 ~~Financial~~ ~~Statements~~Regulation ~~and~~FD ~~Exhibits~~Disclosure

On April 29, 2005, Great Lakes Chemical Corporation (cthe “Company”) ~~Exhibits~~issued a press release announcing that the required waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 related to the Company’s proposed merger with Crompton Corporation has expired. A copy of the press release is included as Exhibit 99.1.

Exhibit		Description
99.1		Press release dated April 25, 2005.

May 2, 2005

William L. Sherwood

William L. Sherwood

Vice President and

Corporate Controller

~~SIGNATURES~~(c) Exhibits

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Exhibit		Description
99.1		Press Release Dated April 29, 2005

Date: April 26, 2005	By:	/s/ WILLIAM L. SHERWOOD
		William L. Sherwood
		Vice President and
		Corporate Controller

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Filing Compare · GREAT LAKES CHEMICAL CORP