Amendment to the Amended and Restated Executive Severance Agreement between Hexcel Corporation and Robert G. Hennemuth, dated December 31, 2008

      Exhibit 10.4

AMENDMENT TO THE AMENDED AND RESTATED EXECUTIVE SEVERANCE AGREEMENT

This Amendment to the AMENDED AND RESTATED EXECUTIVE SEVERANCE AGREEMENT of December 31, 2008 (“Amendment”) between HEXCEL CORPORATION, a Delaware corporation with its principal place of business in Stamford, Connecticut (the "Company"), and Robert G. Hennemuth (the "Executive"), is effective as of June 1, 2018.

WHEREAS, the Company and the Executive entered into an Amended and Restated Executive Severance Agreement on December 31, 2008, which amended and restated the Executive Severance Agreement of March 20, 2006 (the “Agreement”); and

WHEREAS, under Section 8 of the Agreement, the Executive agreed, subject to specified exceptions, not to disclose trade secrets and confidential and proprietary information of the Company, its subsidiaries and affiliates (the “Non-Disclosure Provision”); and

WHEREAS, the Company and the Executive wish to clarify the scope of the Non-Disclosure Provision.

NOW, THEREFORE, in consideration of the mutual covenants of the Executive and the Company and of the Executive's continued employment with the Company, the parties agree as follows:

1.Amendment of Section 8 of the Agreement.  Section 8 of the Agreement is deleted in its entirety and replaced with the italicized language set forth below.

(a) In addition to any obligation regarding Inventions, the Executive acknowledges that the trade secrets and confidential and proprietary information of the Company, its subsidiaries and affiliates, including without limitation:

(i) unpublished information concerning:

(A) research activities and plans,

(B) marketing or sales plans,

(C) pricing or pricing strategies,

(D) operational techniques, and

(E) strategic plans;

(ii) unpublished financial information, including information concerning revenues, profits and profit margins;

(iii) internal confidential manuals; and

(iv) any "material inside information" as such phrase is used for purposes of the Securities Exchange Act of 1934, as amended; all constitute valuable, special and unique information of the Company, its subsidiaries and affiliates.  In recognition of this fact, the Executive agrees that the Executive will not disclose any such trade secrets or confidential or proprietary information (except (A) information which becomes publicly available without violation of this Agreement, (B)

information of which the Executive, prior to disclosure by the Executive, did not know and should not have known was disclosed to the Executive by a third party in violation of any other person's confidentiality or fiduciary obligation, (C) disclosure required in connection with any legal process (provided the Executive promptly gives the Company written notice of any legal process seeking to compel such disclosure and reasonably cooperates in the Company’s attempt to eliminate or limit the scope of such disclosure) and (D) disclosure while employed by the Company which the Executive reasonably and in good faith believes to be in or not opposed to the interests of the Company) to any person, firm, corporation, association or other entity, for any reason or purpose whatsoever, nor shall the Executive make use of any such information for the benefit of any person, firm, corporation or other entity except on behalf of the Company, its subsidiaries and affiliates.

(b)(i) Nothing in this Agreement shall prohibit or restrict the Executive from initiating communications directly with, responding to any inquiries from, providing testimony before, providing confidential information to, reporting possible violations of law or regulation to, or filing a claim or assisting with an investigation directly with a government agency or entity or a self-regulatory authority, or from making other disclosures that are protected under the whistleblower provisions of any applicable law or regulation.  The Executive need not notify the Company that the Executive is engaging in the activities described in the preceding sentence.  However, if the Executive is required by law to disclose confidential information, other than to a government agency or entity or a self-regulatory authority, the Executive shall give prompt written notice to the General Counsel of the Company and shall otherwise comply with the requirements of subsection (a)(iv)(C) above. Notwithstanding the foregoing, under no circumstance will the Executive be authorized to disclose any information covered by attorney-client privilege or attorney work product of the Company or any of its subsidiaries without prior written consent of the Company’s General Counsel or other Executive designated by the Board of Directors of the Company.

(ii) The Executive has been advised that the U.S. Defend Trade Secrets Act of 2016 provides criminal and civil immunity to U.S. federal and state claims for trade secret misappropriation to individuals who disclose a trade secret to their attorney, a court, or a government official in certain confidential circumstances that are set forth in 18 U.S.C. §§ 1833(b)(1) and 1833(b)(2) related to the reporting or investigation of a suspected violation of the law, or in connection with a lawsuit for retaliation for reporting a suspected violation of the law.

(a) Other than as set forth in this Amendment, all terms used in this Amendment shall have the meaning set forth in the Agreement.

(b) Other than as amended by this Amendment, all other terms in the Agreement shall remain in full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment to the Amended and Restated Executive Severance Agreement as of the date and year first above written.

HEXCEL CORPORATION

By:/s/ Gail E. Lehman

Name:   Gail E. Lehman

/s/ Robert G. Hennemtuth

Robert G. Hennemuth ("Executive")