The shelf life for the 3M Aluminum Foil Shielding tape, 1170 Series is 5 years from the date of Manufacture.
Example part number.
DigiKey part number 3M158380-ND. Manufactures part number 1170-1/2"X18YD
Data sheet link:
Microsoft Word - 78-8127-9952-2 Rev B.docx
Snip from the data sheet.
