Refrigerants - Chemicals - Refrigeration Oils R-13: Very low temperature refrigeration systems typically operate in two or more stages (cascade type systems). It would be nearly impossible to achieve low temperatures in a single stage with an inexpensive compressor. Older cascade systems had a low temperature stage which used a lower boiling point gas, such as R-13 or R-503, and a high stage which typically used R-12, R-22, or R-502. Hydrocarbons are often added to very low temperature systems to make sure the oil stays fluid and returns from the very cold evaporator. R-13 can be replaced by R-23 or R-508B. R13 refrigerant, CFC, 5 lb. cylinder Container Size: 5 Lb CylinderComposition (Weight %): 100ASHRAE Standard 34 Safety Rating: A1Boiling Point (1 atm, °F): -114.3Critical Density (Lb/Ft³): 35.9Critical Pressure (psia): 567.8Critical Temperature (°F): 84.6Heat of Vaporization (bp, BTU/Lb.): 64.35Liquid Density (70 F, Lb/Ft³): 72.7Molecular Weight: 104.5Specific Heat Liquid (70 F, BTU/Lb. °F): 0.2876Specific Heat Vapor (1 atm, 70 F, BTU/Lb. °F): 0.1445Vapor Density (bp, Lb./Ft³): 0.0432
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