508B

A non-ozone depleting azeotrope of R-23 and R-116 used to replace R-13 and R-503 in the low stage of cascade systems. For new equipment and retrofits.

Related TDS/SDS

General Information

  • ASHRAE #R-508B
  • ClassHFC
  • Refrigerant TypeAzeotrope
  • Typical LubricantPOE
  • SubstitutesCFC-13 / R-503
  • ContainsHFC-23 (46%), FC-116 (54%)
  • NotesLower discharge temperatures than R-13 and R-23. Good performance match to R-503.

Physical Properties

  • Chemical NameTrifluoromethane, Hexafluoroethane
  • Chemical NotationCHF3, C2 F6
  • Molecular Weight (lbm/lbmol)95.4
  • Boiling Point @ 1 Atm, (°F)-125.3
  • Critical Temperature (°F) (ASTM D-1321)53.289
  • Critical Pressure* (psia)549.54
  • Saturated Liquid Density @ 86°F, (lb/ft3)79.8 @ 30°F
  • Specific Heat of Liquid @ 86°F, (Btu/lb•°F)0.30 @ 30°F
  • Specific Heat of Vapor @ Constant Pressure* (Cp), @ 86° and 1 Atm, (Btu/lb•°F)0.14 @ 30°F
  • Flammable range, %vol. in air (Based on ASHRAE Standard 34 with Match Ignition)None
  • ANSI/ASHRAE Standard 34-1992 Safety Group ClassificationA1