Characteristics of the refrigerant R

Trade designation: Frigen R 12, Freon R 12

Chemical designation: CCI2F2 (Dichlorfluor-

methane) or CF2CI2 (Difluordichlormethane)

R 12 is colorless, odorless, non-toxic, non-combustible and heavier than air.

Boiling point: - 30° C at atmospheric pressure. At higher pressure, R 12 is also still fluid at higher temperatures (e.g. in the pressure bottle).

Chemical behavior with respect to other substances

1. R 12 does not attack most metals, particularly iron, copper, brass and aluminum, but lead may react with R 12 under certain circumstances. For this reason, lead is not used in refrigeration engineering.

2. Many plastics are decomposed by R12. Seals and closures etc. made of plastic must be used only if they have been specially recommended by the refrigerant companies.

3. R 12 dissolves oil. The special refrigerating oil required for lubricating the compressor circulates in the refrigerant circuit. Additives or contaminations in the oil enter into chemical reactions with R 12: consequently, only oils suitable for the refrigerant R 12 must be used.

4. Moisture in the refrigerant leads to decomposition of the refrigerant oil and to icing of the expansion valve. For this reason, dismantled lines and assemblies and test instruments must be sealed immediately after use in order to keep out air humidity and dirt particles.

Characteristics of the refrigerant R 12

Printed in Germany - XXV, 1990

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