Physical Property Molecular Formular CH3CH2CH3 Component PROPANE R290 Molecular Weight 44.10 Boiling Point -42.1℃ Critical Temperature 96.6℃ Critical Pressure Mpa 4.248 GWP 3.3 ODP 0 Quality Index Purity ≧99.9％ Moistyre PPM ≦10 Acidity PPM ≦1.0 Vapor Residue PPM ≦0.01 Appearance Colorless, No turbid Odor No strange stench