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147
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Comparison of saturated vapour pressure
1-3) Combustion Charactaristic
R32 is possible to combust slightly when following conditions (gas density and ignition energy) coincide.
a) Combustible gas density by mixture with the air
In the event that if the ignition source which is possible to ignite is within the gas density mentioned in table 3, R32
might combust.
However, the combustible gas density of R32 is higher than that of propane’s one.
In addition, since the combustible gas density condition of R32 is possible to cause hypoxia (density of oxygen in the
air is less than 18%), this is not the environment where people can work normally.
Combustible density range
b) Energy necessary for ignition.
It is said that R32 is less combustible gas than propane, since the energy which enables to combust is big, for example,
static electricity around the human body and electric lighter (few mJ) can not make it ignite.
Minimum energy to ignite
c) Combustion speed
Since the combustion speed of R32 is low, it never combusts explosively like propane.
Combustion speed
Consequently, although the ignition never happens under the conditions of usual use and work, however, in the event of
the ignition, please handle with great care because the re might extend once the ignition occurs.
1-4) Refrigerant oil for R32
The refrigerant oil for R32 differs from the mineral oil which is being used for R22, since it is based on the synthetic oil for
R32, please ensure to use the designated one.
Refrigerant
Temperature
R32 R410A R22
-20 0.30 0.30 0.14
0 0.71 0.70 0.40
20 1.37 1.35 0.81
40 2.38 2.32 1.43
60 3.84 3.73 2.33
65 4.29 4.17 2.60
R32 Propane (Reference)
Density upper limit (vol%) 29.3 9.5
Density lower limit (vol%) 13.3 1.8
R32 Propane
Minimum energy to ignite (mJ) 15 0.246
R32 Propane
Combustion speed (cm/s) 6.7 38.7
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