POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints
Virginia H. Johnson, Chief Legal Officer, General Counsel and
Secretary of Aspen Aerogels, Inc. (the "Company"), and John Rudy, Nishant
Dharia, Amanda Mei, Michael Goldberg, Robyn Frattali, Brenda
Meyette, Emily Spaulding, Tanya Sylla, and Nyisha Shakur of Mintz, Levin, Cohn,
Ferris, Glovsky and Popeo, P.C., signing singly, with full power of
substitution, the undersigned's true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, forms and authentication
documents for EDGAR Filing Access;

(2) do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such
forms and authentication documents;

(3) execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer, director and/or 10% shareholder of the Company,
Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act
of 1934 and the rules thereunder;

(4) do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such
Form 3, 4 or 5 and timely file such form with the United States Securities and
Exchange Commission and any stock exchange or similar authority;
and

(5) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact, on behalf
of the undersigned pursuant to this Power of Attorney, shall be in such form and
shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of
the undersigned, is not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed this 5th day of September, 2023.

By:/s/ Stephanie Pittman
Name: Stephanie Pittman