When it comes to an immersion solution - what we call solvent - for cleaning, the choices just keep coming. Some operators are willing to switch with each introduction of a new formula, others are more cautious. This is not an endorsement, but an overview of where we have been, and where we seem to be now. When the spotlight was focused on the drycleaning industry in the late 1980s, there was a scramble to replace perchloroethylene, or perc, with something. Prior to perc, cleaning was done in petroleum, but without all the safety features we find on modern "multi-solvent" cleaning machines. Then around 1945, an immersion solution that was a much better grease remover and had no flash point was introduced: perc.
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