Refrigerants - Chemicals - Refrigeration Oils R-508B: Used in very-low-temperature refrigeration systems, typically the low stage of a multi-stage system. R-508B has properties similar to R-503 and can be used to replace either R-13 or R-503 in an existing system. The discharge temperature does not increase significantly compared to R-23. POE lubricants should be used, and it may still be necessary to charge hydrocarbon oil additives to ensure proper oil return. Check with OEM for specific oil and charging recommendations. R508B refrigerant, HFC, 5 lb. cylinder Container Size: 5 Lb CylinderComposition (Weight %): R-23/116 (46 / 54)ASHRAE Standard 34 Safety Rating: A1Boiling Point (1 atm, °F): -125.3Critical Density (Lb/Ft³): 35.6Critical Pressure (psia): 556.1Critical Temperature (°F): 53.7Heat of Vaporization (bp, BTU/Lb.): 71.4Liquid Density (20 F, Lb/Ft³): 65.63Molecular Weight: 95.4Specific Heat Liquid (20 F, BTU/Lb. °F): 0.4263Specific Heat Vapor (1 atm, 20 F, BTU/Lb. °F): 0.1701Vapor Density (bp, Lb./Ft³): 0.409
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