Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
The Board of Directors
Aspen Aerogels, Inc.:
We consent to the use of our report dated March 12, 2021, with respect to the consolidated balance sheets of Aspen Aerogels, Inc. and subsidiaries as of December 31, 2020 and 2019, the related consolidated statements of operations, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes, and financial statement schedule II – Valuation and Qualifying Accounts, and the effectiveness of internal control over financial reporting as of December 31, 2020 incorporated by reference herein and to the reference to our firm under the heading “Experts” in the prospectus.
Our report refers to a change in accounting principles related to leases.
/s/ KPMG LLP
Hartford, Connecticut
March 12, 2021