Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HP-557 found under Sorbent Oil by 3M Company. The National Stock Number assigned to this part is 4235013993031, and the Federal Supply Class is 4235 Hazardous Material Spill Containment And Clean Up Equipment And Material. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HP-557.