MYLAR® LBT is an uncoated, transparent polyester film that has been corona treated on one side to provide superior wetting and adhesion of inks, primers, and adhesives. The standard wind-up presents the corona-treated side facing the roll core. It is also available without corona treatment or with corona treatment on both sides. These products are known as MYLAR® LB and MYLAR® LBT2 respectively.
This film frequently is selected as a component of a laminated structure because of its ability to contribute great strength, high temperature resistance, and flavor/odor barrier. Its sparkling clarity and relative insensitivity to heat and humidity make it an ideal print carrier and outer ply of many laminated food packaging structures. Retention of properties over a temperature range from -100°F to 300°F permits uses requiring freezer storage temperatures followed by heating for warming, cooking or ovenable applications. The chemical resistance and barrier to acids, weak bases, greases and oils, detergents and other active ingredients make it useful in containing many "hard-to-hold" food or non-food products. This film is not degraded by standard sterilization procedures involving steam retorts, gamma or cobalt radiation, ethylene oxide gas exposure, or hydrogen peroxide immersion.
MYLAR® LBT typically is used as the reverse printed outer ply of a lamination with inner plies providing additional oxygen barrier if needed, as well as heat sealability. The availability of the two-side corona-treated MYLAR® LBT2 permits use where the ply will be buried inside a lamination with bonding to both surfaces or where the exposed outer surface will subsequently receive surface printing, code dating, or some form of package lot identification.