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Name: S Hudson
Status: Other
Age: N/A
Location: N/A
Country: N/A
Date: December 1991


Question:
Polystyrene foam has a bad rap. A workshop I attended gave me the information that Polystyrene foam is actually very reusable. Is this true?



Replies:
Sure, any material that does degrade or decompose is reusable. The question is whether an economically viable system for collecting and reusing it can and will be developed. Polystyrene foam manufacturers make money by making polystyrene foam, not by reusing it. Ultimately, the cost to society might be lower if it were collected and reused, but who will organize and pay for the effort? Three watch-words for controlling material consumption are "reduce"-"reuse"- "recycle". If you cannot avoid using polystyrene foam, you might find some other use for it - polystyrene foam packing peanuts make pretty good drainage for potted plants for example. As far as recycling goes (using discarded materials as raw materials for producing new materials) I do not know of anyone who does it (my city collects glass, metal, and paper, but not polystyrene foam). I am not enough of a chemist to know if it is technically possible to recycle polystyrene foam, but I take the lack of any recycling program to be a sign that it is cheaper to make new polystyrene foam than it is to reuse old polystyrene foam for the immediate future. In the distant future, it may be economical to mine landfills to retrieve materials like polystyrene foam.

Don Libby


September 2005
There are two common forms of polystyrene: extruded and expanded.

Extruded polystyrene is used for building insulation. It is strong, stable, and absorbs little water. It can be, and often is, reused for building insulation. Polystyrene foam is the brand name of extruded polystyrene manufactured by Dow. Unfortunately, it has become a common term for all foam plastics.

Expanded polystyrene is less dense, has less insulating value, and can hold water. It can also be used as building insulation (often called "beadboard" as it is made of polystyrene beads), but it is also used for coffee cups, sandwich boxes, packaging, and other disposable products.

Sheldon



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