Volkswagen Polo Service & Repair Manual: Refrigerant R134a Physical Data

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C System, General Information / Refrigerant R134a / Refrigerant R134a Physical Data

Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance which boils easily, designated as refrigerant.

The refrigerant employed is tetrafluoroethane R134a, which boils at -26.5 °C (-15.7 °F) at a vapor pressure of 1 bar (14.5 psi).

Chemical formula	CH2F–CF3 or CF3–CH2F
Chemical designation	Tetrafluoroethane
Boiling point at 1 bar (14.5 psi)	-26.5 °C (-15.7 °F)
Solidification point	-101.6 °C (-150.88 °F)
Critical temperature	100.6 °C (213 °F)
Critical pressure	40.56 bar absolute (588 psi) equals 39.5 bar pressure (573 psi)

Critical Point

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