Refrigerant R134A Properties: Combustibility
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Refrigerant is non-flammable. It actually has a fire-resistant or fire extinguishing effect. Refrigerant breaks down when exposed to flames or extremely hot surfaces. UV light (occurring for example during electric welding) also causes refrigerant decomposition. The resulting decomposition products are toxic and must not be inhaled. However, irritation of the mucous membranes provides an adequate and timely warning.