Responding to calls from the European Union to begin phasing out in 2011 the use of hydroflurocarbon-based refrigerants in automotive air-conditioning systems, DuPont Co. is touting significant progress in its development of a new hydrofluro-olefin alternative it is working on with Honeywell International Inc. Called HFO-1234yf, the new refrigerant compound is aimed at replacing the currently widely used HFC R-134a through fewer greenhouse-gas emissions, the ability to improve vehicle fuel ...

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