Low Density Polyethylene
Often simply referred to as LDPE, this thermoplastic has been around since the 30s. In modern usage, we can find LDPE in a number of applications, though with regard to food, some of the more common ones are as transparent deli trays, six-pack rings, brick packaging lamination, and of course, closures of all sorts. LDPE has become a successful material not only for its versatility in packaging and manufacturing, but because it provides excellent resistance to both acids and bases, as well as alcohols. It also offers fairly good resistance to vegetable and mineral oils.