Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MR4000LEXAN found under by Insulgard Corp. The National Stock Number assigned to this part is 9330011243310, and the Federal Supply Class is 9330 Plastics Fabricated Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MR4000LEXAN.