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HYDROFLUOROCARBON-404A 76 These values can be converted to parts per million as follows: HFC-143a: 9,017 mg/m3Ã 0.29 = 2,615 ppm HFC-125: 7,630 mg/m3 Ã 0.20 = 1,526 ppm HFC-134a: 694 mg/m3 Ã 0.24 = 167 ppm. 24-hr EEGL of HFC-404a = 2,615 + 1,526 + 167 â 4,300 ppm. 90-day CEGL: Of the mixture, 52% or 3,064 mg/m3 Ã 0.52 = 1,593 mg/m3 is HFC-143a 44% or 3,064 mg/m3 Ã 0.44 = 1,348 mg/m3 is HFC-125 4% or 3,064 mg/m3 Ã 0.04 = 123 mg/m3 is HFC-134a. These values can be converted to parts per million as follows: HFC-143a: 1,593 mg/m3 Ã 0.29 = 462 ppm HFC-125: 1,348 mg/m3 Ã 0.20 = 270 ppm HFC-134a: 123 mg/m3Ã 0.24 = 30 ppm. 90-day CEGL of HFC-404a = 462 + 270 + 30 = 800 ppm. REFERENCES ACGIH (American Conference of Governmental Industrial Hygienists). 1999. TLVs and BEIs. Threshold Limit Values for Chemical Substances and Physical Agents. Biological Exposure Indices. Cincinnati, OH.: American Conference of Governmental Industrial Hygienists. AIHA (American Industrial Hygiene Association). 1991. Workplace Environmental Exposure Level Guide: 1,1,1,2-Tetrafluoroethane. Akron, OH.: American Industrial Hygiene Association. AIHA (American Industrial Hygiene Association). 1996. Workplace Environmental Exposure Level: 1,1,1-Trifluoroethane. Fairfax, Va.: American Industrial Hygiene Association.
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