The highest performance, most prevalent, and most interesting films used in demanding applications are resistance films.

• Usually 2 or 3 plies (layers)
• Sealant Layer: provides specific seal temperature and hot tack characteristics
• Top Outside Layer: usually facilitates reverse printing, generally crystal clear, provides higher melting point than sealant layer (allowing user user to crank up the seal bar temperatures to run faster or insure a good seal), provides barrier or breathability characteristics
• Center Layer: provides super light or oxygen barriers
• Subcategories (2-ply films): polyester-poly, polypropylene-poly, polystyrene-poly, metallized polyester or metallized polypropylene-poly, nylon-poly, cellulose-poly, HDPE-poly, plus more