SOLSTICE® N15

Solstice® N15 (R-515B) is a non-flammable azeotropic blend designed for medium temperature commercial refrigeration and high-temperature cooling systems. This hydrofluoroolefin (HFO) blend demonstrates environmental and performance benefits in new systems. It has reduced GWP: 77% lower than R-134a. Equal efficiency as compared to R-134a.

Physical Properties

  • Molecular Weight (lbm/lbmol)117.5 lbm/lb-mol
  • Boiling Point @ 1 Atm, (°F)-2.0°F
  • Critical Pressure* (psia)507 psig
  • Critical Temperature (°F)228.0 °F
  • Flammable range, %vol. in air (Based on ASHRAE Standard 34 with Match Ignition)Nonflammable
  • Critical Volume (ft3/lb)0.0322 ft³/lbm
  • Critical Density (lb/ft3)31.03 lbm/ft³
  • Vapor density at boiling point (lb/ft3)0.367 lbm/ft³
  • Liquid density at 32ºF (lb/ft3)78.56 lbm/ft³
  • Liquid density at 77°F (lb/ft3)73.65 lbm/ft³
  • Vapor density at 77ºF (lb/ft3)1.69 lbm/ft³
  • Liquid heat capacity at 77°F (Btu/lb·°F)0.33 Btu/lbm-°F
  • Vapor heat capacity at 77°F (Btu/lb·°F)0.23 Btu/lbm-°F
  • Heat of vaporization at boiling point (Btu/lb)81.7 Btu/lbm
  • Vapor Pressure at 77°F (psia)57.45 psig
  • Liquid thermal conductivity at 77°F (mBtu/h-ft-°F)0.042 Btu/hr-ft-°F
  • Vapor thermal conductivity at 77°F (mBtu/h-ft-°F)0.008 Btu/hr-ft-°F
  • Liquid viscosity at 77°F (μlb/ft·hr)0.4864 lbm/ft-hr
  • Vapor viscosity at 77°F (μlb/ft·hr)0.0299 lbm/ft-hr
  • Class/TypeAzeotropic blend
  • FormulaR-1234ze / R-227ea (91.1% / 8.9%)
  • AppearanceColorless
  • GWP REV /5TH IPCC299
  • ASHRAE STD. 34 Safety ClassA1
  • LFL (percentage vol)Nonflammable