Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HUMISEAL TYPE 1B31 found under Insulating Varnish by Chase Industries Inc. The National Stock Number assigned to this part is 5970014976970, and the Federal Supply Class is 5970 Electrical Insulators And Insulating Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HUMISEAL TYPE 1B31.