Many of us use the term Styrofoam as a reference to most plastic foam packaging. We include foam drinking cups, packaging peanuts and the white material that our appliances, toys and so many other items are packaged in. In fact, most of this is not Styrofoam. Styrofoam is a registered trademark of Dow Chemical for an extruded polystyrene foam material sometimes referred to as XPS. This material is always made in a sheet form and is generally the color blue. The primary use for Styrofoam is for building insulation although you may find it used in Geofoam applications or in block form in the hobby store. As Dow states on their website, "
You can't drink coffee from a STYROFOAM cup.
(There's no such thing.)"