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Polyurethane is thermoplastic, and is usually made into a foam form. It retards the passage of heat very well, and is used widely today as insulation in refrigerators and freezers. It's also used as upholstery cushions, mattresses and pillows, and carpet pads. It's flammable unless specially treated.

Avoid contact with flame for cushions, mattresses, etc.

This article was written by Anne Field, Extension Specialist, Emeritus, with references from Ohio Extension bulletins Choosing and Using Microwave Utensils and Accessories and other Plastics handouts.



MSU 2003