https://www.3m.com/3M/en_US/p/c/building-materials/fire-protection/devices-wrap-strips/i/electronics/
3M Firestop Devices & Wrap Strips for Electronics | 3M United States
Bands of material made to be wrapped around pipes or ducts that are designed to help prevent the passage of fire and smoke through wall or floor assemblies.
firestop deviceswrap stripsfor electronicsunitedstates
https://www.3m.com/3M/en_US/p/c/building-materials/fire-protection/devices-wrap-strips/i/manufacturing/
3M Firestop Devices & Wrap Strips for Manufacturing | 3M United States
Bands of material made to be wrapped around pipes or ducts that are designed to help prevent the passage of fire and smoke through wall or floor assemblies.
firestop deviceswrap stripsfor manufacturingunitedstates