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COOOL R744 is a natural refrigerant gas, with multiple applications in commercial refrigeration, the food industry and refrigerated logistics.

Its main characteristics are:

  • High refrigerating power
  • Higher quality than the specifications required by the regulations
  • GWP - Global Warming Potential = 1
  • ODP - Ozone Depletion Potential =0
  • No legal limits on use
  • No need for disposal

Thanks to the innovative biogas upgrade technology developed by the SIAD group's subsidiaries, COOOL R744 comes from renewable sources, a unique feature on the market.

SIAD has developed a special tanker truck for loading large systems, equipped with an on-board skid, which allows the system to be pressurized with CO2 in the gaseous phase and then loaded with the liquid phase in a single operation. For maintenance on R744 plants, SIAD has fitted a dedicated cylinder, equipped with a two-phase valve, which allows both the liquid and gaseous phase to be dispensed from the same package according to the operator's needs.



Impurities (ppmv)



Capacity (l)

Contents (kg)


≥ 99.9 %

H2O ≥ 10 ppm

Incondensable ≥ 5 ppm

Tanker truck

9800 l

7000 kg

Cylinder bundle*

16 x 40 l

480 kg

Steel cylinder with two-phase valve

40 l

30 kg

Steel cylinder with two-phase valve

27 l

20 kg

     * 16 cylinders 40 l (640 l)

     Degree of filling: 0.75 kg/l                                                                                                     Valve connection: UNI 11144-2 ex UNI 4406

Chemical and physical properties

Physical state:

Liquefied gas

Molecular weight:

44 g/mol

Melting point:

-78.5 °C

Boiling point (at 1.013 bar):

-56.6 °C

Critical temperature:

31 °C

Critical pressure:

73.8 bar

Relative density, gas (*):

1.52 (air=1)

Relative density, liquid:

0.82 (water=1)

Vapour pressure at 20°C:

57.3 bar


Colourless gas



Safety classification (ASHRAE 34)


(*) at 1.013 bar and 21.1 °C