Aspen Aerogels, Inc. on February 3, 2021 entered into a supply agreement with Silbond Corporation (“Silbond”), for the purchase of certain silanes (the “Product”). Pursuant to the Supply Agreement, the Company agrees to purchase and Silbond agrees to supply, all of the Company’s requirements for the Product through the term of the Supply Agreement which term ends on September 30, 2023, unless either party terminates the agreement early pursuant to the terms of the agreement.