Heat-sealable film is made with co-extrusion process that allows the insertion of other materials like heat-sealable additive. There are two kinds of heat-sealable film: one-side or both side. It is suitable for printing and lamination and possesses characteriastics of good moisture proof, transparency, stiffness, harmful-substance-free, and keeping freshness. Therefore, the film is approved by F.D.A. of the U.S. and widely used for food packaging.