3M™ Double Coated Tape 9690 offers high adhesion to a wide variety of substrates, including plastics and foams. The polyester film (PET) carrier provides dimensional stability and improved handling during slitting and die cutting operations. - The variances in thickness often make an important difference in proper performance. Liner on the back which you peel away from to expose the adhesive material before applying to the substrate. The liner material for this product is composed of kraft paper.