R-134a Environmental Classification HFC Molecular Weight 102.3 Boiling Point (1atm,°F) -14.9 Critical Pressure (psia) 588.3 Critical Temperature (°F) 213.8 Critical Density (lb./ft^ 3) 32.04 Vapor Density (bp,lb./ft^ 3) 0.328 Heat of Vaporization (bp,BTU/lb.) 93.3 Global Warming Potential (CO2 = 1.0) 1430 ASHRAE Standard 34 Safety Rating A1