Styrofoam is a trademark of
The Dow Chemical Company for closed-cell
extruded polystyrene foam currently made for
thermal insulation and craft applications. In 1941, researchers in Dow's Chemical Physics Lab found a way to make foamed polystyrene. Led by
Ray McIntire, they "rediscovered" a method first discovered by
Swedish inventor
Carl Georg Munters.
[1] Dow acquired exclusive rights to use Munters' patents and found ways to make large quantities of extruded polystyrene as a closed cell foam that resists moisture.
Because of its insulating properties and buoyancy, it was adopted in 1942 by the
United States Coast Guard for use in a six-person
life raft.
Styrofoam has since found an immense variety of uses. Dow produces Styrofoam building materials, including insulated sheathing and pipe insulation. The claimed
R-value of Styrofoam insulation is five per inch.
[2] Styrofoam insulation has been used in many notable buildings and facilities in North America.
[3]
Dow also produces Styrofoam as a structural material for use by
florists and in craft products.
[4] Dow insulation Styrofoam has a distinctive blue color; Styrofoam for craft applications is available in white and green.
Styrofoam can be used under roads and other structures to prevent soil disturbances due to freezing and thawing.
[5][6]
In the United States and
Canada, the word
styrofoam is often incorrectly used as a
generic term for expanded polystyrene foam, such as disposable coffee cups, coolers, or cushioning material in packaging, which are typically white and are made of expanded polystyrene beads. This is different from the extruded polystyrene used for Styrofoam insulation. The polystyrene foam used for craft applications, which can be identified by its roughness and by the fact that it "crunches" when cut, is moderately soluble in many organic solvents,
cyanoacrylate, and the propellants and solvents of
spray paint, and is not specifically identified as expanded or extruded.
Original source
http://en.wikipedia.org/wiki/Styrofoam