| In its pure state, refrigerant R134a is chemically stable
and does not attack iron or aluminium. |
| However, impurities such as chlorine compounds in the
refrigerant do attack certain metals and plastics. This can lead
to blockages, leaks and deposits on the air conditioner
compressor piston. |
|
|
|
| Critical temperature and critical
pressure |
| Up to a gas pressure of 39.5 bar positive pressure
(corresponding to a temperature of 101°C) the refrigerant R134a
remains chemically stable; however, above this temperature the
refrigerant decomposes (see Combustibility). |
|
Questions & answers
Effects on metal — Volkswagen Golf Mk7
Does R134a attack metals in the Golf Mk7 AC system?
Pure R134a is chemically stable and does not attack iron or aluminium. However, if moisture enters the system, acid forms that corrodes metal components.
In an enclosed container that is not completely full,
refrigerant evaporates as vapour at the surface in a quantity
sufficient to form an equilibrium between vapour a ...
Only very small amounts of water are soluble in liquid
refrigerant. On the other hand, refrigerant vapour and water
vapour mix in any proportion.
...
