UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

~~Washington~~WASHINGTON, ~~D.C.~~DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

~~the~~Date ~~Securities~~of ~~Exchange~~report ~~Act~~(Date of ~~1934~~earliest event reported): December 16, 2004

~~Date~~Gundle/SLT ~~of Report: (Date of earliest event reported): April 21~~Environmental, ~~2004~~ Inc.

GUNDLE/SLT ENVIRONMENTAL, INC.

(Exact name of registrant as specified in its charter)

Delaware	1333-~~9307~~118278	22-2731074
(State of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

19103 Gundle Road, Houston, Texas 77073

~~Houston~~(Address of Principal Executive Offices, ~~Texas~~including ~~77073~~Zip Code)

(Address of Registrant’s principal executive offices)

(281) 443-8564

(Registrant’s ~~telephone~~Telephone ~~number~~Number, ~~including~~Including ~~area~~Area ~~code~~Code)

~~Not~~Check ~~Applicable~~the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

~~(Former~~¨ ~~name~~Written orcommunications ~~former~~pursuant ~~address,~~to ifRule ~~changed~~425 ~~since~~under ~~last~~the ~~report)~~Securities Act (17 CFR 230.425)

~~Item~~¨ Soliciting material pursuant to Rule 14a-12. ~~Disclosure~~(b) ofunder ~~Results~~the ofExchange ~~Operations~~Act ~~and~~(17 ~~Financial~~CFR ~~Condition~~240.14a-12 (b))

On¨ ~~April~~Pre-commencement ~~21,~~communications ~~2004,~~pursuant ~~Gundle/SLT~~to ~~Environmental,~~Rule ~~Inc.~~14d-2 (~~the “Company”~~b) ~~issued~~under ~~a press release announcing operating results for~~ the ~~quarter~~Exchange ~~ended~~Act ~~March~~(17 ~~31,~~CFR ~~2004~~240.14d-2 ~~A copy of this press release is being furnished as an exhibit to this report pursuant and is incorporated herein by reference.~~ (b))

~~Item~~¨ 7.Pre-commencement ~~Financial~~communications ~~Statements,~~pursuant ~~Pro~~to ~~Forma~~Rule ~~Financial~~13e-4 ~~Information~~(c) ~~and~~under ~~Exhibits~~ the Exchange Act (17 CFR 240.13e-4 (c))

~~(c)~~Item ~~Exhibits~~5.02. Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

~~99.1~~(b) ~~- Gundle/SLT~~Appointment ~~Environmental,~~of ~~Inc.~~Director ~~Press Release dated April 21, 2004.~~

~~[Signature~~On ~~page~~December ~~follows]~~16, 2004, the board of directors of Gundle/SLT Environmental, Inc. (the “Company”) appointed Richard E. Goodrich as a director to serve until the annual meeting of stockholders of the Company or until his successor is duly elected and qualified. Mr. Goodrich will serve as chairman of the audit committee of the board of directors.

2Mr. Goodrich is a certified public accountant with 40 years experience in accounting and financial management positions. Since 1998, Mr. Goodrich has held various positions with Chicago Bridge & Iron Company, including the position of Executive Vice President and Chief Financial Officer since 2001, and Group Vice President – Western Hemisphere Operations. From 1976 until 1982, and again from 1989 until 1998, Mr. Goodrich worked for Fluor Daniel in positions that included corporate director and controller of various business units. Mr. Goodrich holds a BS in Accounting from East Central Oklahoma State University.

~~SIGNATURE~~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~~hereunto duly authorized.

~~DATED~~GUNDLE/SLT ~~this~~ENVIRONMENTAL, ~~21st~~INC. ~~day~~(Registrant) ~~of April,~~By: ~~2004~~/s/ ROGER J. KLATT Executive Vice President and Chief Financial Officer

~~GUNDLE/SLT ENVIRONMENTAL, INC. By~~Date: ~~/s/~~December ~~Roger J. Klatt Roger J. Klatt~~16, ~~Executive Vice President and Chief Financial Officer~~2004

EXHIBIT INDEX

Exhibit No.		Exhibit
99.1 —		Gundle/SLT Environmental, Inc. Press Release dated April 21, 2004.

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