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  • Meanwhile, eight CFC producers, including Du Pont and ICI, are undertaking a joint toxicity test programme on HFC-32. The programme will take between 3-6 years and cost $US 5 million. Final results under the programmes for HFC-134a, HCFC-123 and HCFC-141b are expected during 1992 and 1993, two years ahead of normal schedule. Results for HCFC-124 and HFC-125 should be completed in 1994 or 1995, and testing of HCFC-225ca and HCFC-225cb should

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