HUNTSMANINTERNATIONAL LLC (As successor by merger to Huntsman LLC) AND THEGUARANTORS NAMED HEREIN, AND HSBC BANK USA,NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE Dated as of December 20,2005 to Indenture Dated as of June 22,2004 11 1/2% Senior Notes due 2012 and Senior Floating Rate Notes due 2011

Exhibit 4.6

Execution Copy

HUNTSMAN INTERNATIONAL LLC

(As successor by merger to Huntsman LLC)

AND

THE GUARANTORS NAMED HEREIN,

AND

HSBC BANK USA, NATIONAL ASSOCIATION

as Trustee

SUPPLEMENTAL INDENTURE

Dated as of December 20, 2005

to

Indenture

Dated as of June 22, 2004

11 ¹/₂%  Senior Notes due 2012
and
Senior Floating Rate Notes due 2011

SUPPLEMENTAL INDENTURE, dated as of December 20, 2005 (this “Supplemental Indenture”), between HUNTSMAN INTERNATIONAL LLC, a Delaware limited liability company (the “Company”) as successor by merger to Huntsman LLC, a Utah limited liability company, the Guarantors named herein, and HSBC BANK USA, NATIONAL ASSOCIATION, a national banking association duly organized under the laws of the United States, as trustee (the “Trustee”). All capitalized terms used and not defined herein shall have the respective meanings assigned to them in the Indenture.

WHEREAS, the Company, the Guarantors and the Trustee are parties to an Indenture, dated as of June 22, 2004, as supplemented by the Supplemental Indenture thereto dated July 11, 2005 and the Supplemental Indenture thereto dated August 16, 2005  (the “Indenture”), pursuant to which the Company issued its 11 ¹/₂% Senior Notes Due 2012 and Senior Floating Rate Notes (collectively, the “Notes”);

WHEREAS, on the date hereof, all of the membership interests of Huntsman Advanced Materials Holdings LLC, a Delaware limited liability company (“HAMH”), have been contributed to the Company (the “Contribution”);

WHEREAS, in connection with the Contribution, HAMH and the Subsidiaries of HAMH who are listed on the signature page hereto under the heading “New Guarantors” (the “New Guarantors”) wish to become Guarantors under the Indenture in accordance with Section 4.18 and Article X thereof;

WHEREAS, Section 9.01 of the Indenture provides that the Company, the Guarantors and the Trustee may amend the Indenture by means of this Supplemental Indenture without the consent of the holders of Notes for the foregoing purposes;

WHEREAS, the Company has delivered to the Trustee the required Officers’ Certificate and Opinion of Counsel in connection with the execution and delivery of this Supplemental Indenture; and

WHEREAS, the execution and delivery of this Supplemental Indenture have been duly authorized and all conditions and requirements necessary to make this Supplemental Indenture a valid and binding agreement have been duly performed and complied with;

NOW, THEREFORE, for and in consideration of the premises and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, it is mutually covenanted and agreed, for the equal proportionate benefit of all Holders of the Notes, as follows:

ARTICLE I

GUARANTEES

Section 1.1                                   Guarantees.  Each New Guarantor hereby, in compliance with Section 4.18 of the Indenture, Guarantees the obligations of the Company under the Indenture and the Notes in the manner specified in Section 10.01 of the Indenture and becomes a party to the Indenture as a Guarantor, in each case subject to all of the rights, obligations and other provisions and limitations (including release provisions) of the Indenture relating to Guarantors.

ARTICLE II

MISCELLANEOUS PROVISIONS

Section 2.1                                   Upon execution and delivery of this Supplemental Indenture, the terms and conditions of this Supplemental Indenture shall be part of the terms and conditions of the Indenture for any and all purposes, and all the terms and conditions of both shall be read together as though they constitute one and the same instrument, except that in case of conflict, the provisions of this Supplemental Indenture will control.

Section 2.2                                   Each of the Company, the Guarantors and the Trustee hereby confirms and reaffirms the Indenture, as amended and supplemented by this Supplemental Indenture.

Section 2.3                                   The parties may sign any number of copies of this Supplemental Indenture.  Each signed copy shall be an original, but all of them together shall represent the same agreement.  One signed copy is enough to prove this Supplemental Indenture.

Section 2.4                                   This Supplemental Indenture shall be governed by, and construed in accordance with, the laws of the State of New York.

Section 2.5                                   The recitals contained herein shall be taken as the statements of the Company or the Guarantors, as applicable, and the Trustee assumes no responsibility for their correctness.  The Trustee shall not be liable or responsible for the validity or sufficiency of this Supplemental Indenture or the due authorization of this Supplemental Indenture by the Company or the Guarantors.  In entering into this Supplemental Indenture, the Trustee shall be entitled to the benefit of every provision of the Indenture relating to the conduct of, affecting the liability of or affording protection to the Trustee, whether or not elsewhere herein so provided.

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2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the day and year written above.

[Signature Page to Supplemental Indenture]