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MAC in the US: HFO-1234yf approved; HFC-134a being phased out ?

On February 28, 2011, the US Environmental Protection Agency (EPA) issued final approval for use of HFO-1234yf in motor vehicle air conditioning in new cars and light trucks. HFO-1234yf had already been approved for use in Japan and Europe. HFO-1234yf, developed by DuPont and Honeyw...

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