<Dt> High - density polyethylene (HDPE) </Dt> <Dd> HDPE is the most widely used resin for plastic bottles . This material is economical, impact resistant, and provides a good moisture barrier . HDPE is compatible with a wide range of products including acids and caustics but is not compatible with solvents . It is supplied in FDA - approved food grade . HDPE is naturally translucent and flexible . The addition of color will make HDPE opaque, but not glossy . HDPE lends itself to silk screen decoration . While HDPE provides good protection at below freezing temperatures, it cannot be used with products filled above 190 ° F (88 ° C) or products requiring a hermetic (vacuum) seal . </Dd> <Dt> Fluorine - treated HDPE </Dt> <Dd> These bottles are exposed to fluorine gas in a secondary operation, are similar in appearance to HDPE, and serve as a barrier to hydrocarbons and aromatic solvents . Fluorine - treated bottles may contain insecticides, pesticides, herbicides, photographic chemicals, agricultural chemicals, household and industrial cleaners, electronic chemicals, medical cleaners and solvents, citrus products, d - limonene, flavors, fragrances, essential oils, surfactants, polishes, additives, graffiti cleaning products, pre-emergents, stone and tile care products, waxes, paint thinner, gasoline, biodiesel, xylene, acetone, kerosene and more . </Dd>

When did soda start coming in plastic bottles