This is an article written by John Murphy on the history of the ties between the refrigeration and polyurethane foam industries.
The history of the refrigeration industry has been tired to that of the polyurethane foam industry for decades, and even more closely to that of the foam blowing agents. This is an attempt to give an unbiased history of some of the modifications in design brought about the changes in insulation raw materials used in manufacture over the past several decades, and how current regulatory pressures might influence further changes.
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Appliance Design 2014