Styrofoam

DuPont also has produced a line of green and white foam shapes for use in crafts and floral arrangements.

[3][1] Styrofoam is, however, a far less dense material than EPS and is more commonly suited to tasks such as thermal insulation.

In the 1940s, researchers, originally at Dow's Chemical Physics Lab, led by Ray McIntire, found a way to make foamed polystyrene.

[4] Dow found ways to adapt Munters's method to make large quantities of extruded polystyrene as a closed cell foam that resists moisture.

[1] The EPA and International Agency for Research on Cancer reported limited evidence that styrene is carcinogenic for humans and experimental animals, meaning that there is a positive association between exposure and cancer and that causality is credible, but that other explanations cannot be confidently excluded.