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6 Physiological effects of different R717 concentrations (IOR, 2005) Concentration Effect on unprotected human body Exposure Limits 20 ppm Smell readily detected by most people Unlimited 25 ppm HSE long term exposure limit 8hrs per day 5 days per week 35 ppm HSE short term exposure limit 15mins per day not more than 1 hour per week 50 ppm Smell is distinctive and may be irritating Do not stay longer than necessary 70 ppm No dangerous effects on healthy people Leave the area 400 – 700 ppm Immediate irritation to eyes, nose, throat and respiratory system. Under normal circumstances no serious injury in 1 hour 1700 ppm Severe coughing, cramp, serious irritation to nose, eyes, throat and respiratory system 30 mins exposure can lead to serious injury 2000 – 5000 ppm Severe coughing, cramp, serious irritation to nose, eyes, throat and respiratory system 30 mins exposure can lead to death 5000 ppm Respiratory spasm, rapid asphyxia Lethal within a few minutes 138 Safe Refrigerant HandlingPDF Image | Manual for Refrigeration Servicing Technicians
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