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Nucleators are recommended for direct-gassed applications in polystyrene, polyolefins, ABS, PPO, PPE, using freons, pentane, butane, isobutane, nitrogen, and carbon dioxide.
In reaction to the world-recognized detriments of CFC's, or freons, Saab will soon be phasing out its use of freons (R-12) and changing over to a refrigerant void of chlorinated fluorocarbons, well ahead of legislation which will require phase-out.