- Freons are a family of chloro-fluorocarbons that are damn near
indestructible - and also catalyze the destruction of ozone  to
molecular oxygen [O2] - which is why they are such an environmental
Freon-12 [previous primary refrigerant of a/c units]is dichloro difluoro
ethane [C2H2Cl2F2]. But there are many others . . . .
Sorry for the OT, Sven!
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