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USING R-12 & R-134a REFRIGERANT HANDLING/SAFETY PRECAUTIONS 1) Always work in a well-ventilated, clean area. Avoid breathing refrigerant vapors. Exposure may irritate eyes, nose and throat. Refrigerant is colorless and is invisible as a gas. Refrigerant is heavier than oxygen and will displace oxygen in a confined area. 2) The A/C system high pressure can cause severe injury to eyes and skin if a hose were to burst. Always wear eye protection, gloves and other protective clothing when working around A/C system and refrigerant. 3) Refrigerant evaporates quickly when exposed to atmosphere, freezing anything it contacts. If liquid refrigerant contacts eyes or skin (frostbite), DO NOT rub eyes or skin. Immediately flush affected area with cool water for 15 minutes and consult a doctor or hospital. 4) Never use R-134a in combination with compressed air for leak testing. Pressurized R-134a in the presence of oxygen (air concentrations greater than 60 percent by volume) may form a combustible mixture. DO NOT introduce compressed air into R-134a containers (full or empty), A/C system components or service equipment.