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Carbon dioxide at its liquid state makes a treatment to surfaces to be cleaned equal to the degreasing action by vapours: the contaminant become soluble in liquid CO2 .
Besides this power fot its chemical-physical properties has an enormous impregnating power and consequently of penetration in porosities of surfaces to be cleaned.
For what concerns the realization of the equipment working with liquid carbon dioxide Carbonet, Fismet Industriale has had the pleasure to cooperatore with the French Company Separex, world leader in the engineering of cleaning equipment working with supercritical fluids.
The Carbonet's process can be easily worked out: first of all CO2 must be turned liquid, as at environmental pressure and temperature it's a gas.
To reach its liquid state carbon dioixide must be put under controlled pressure and temperature. Once become liqud CO2 is introduced in the treatment chamber in a basket containing pieces to be cleaned.
The machine available at Fismet Industriale factory in Settimo Milanese in Via Darwin (angolo Via Newton), has a treatment chamber with a capacity of 60 litres.
Once CO2 is in the cleaining chamber the degreasing action starts and can have a lasting time from about 10 up to 30 minutes.
After this degreasing action carbon dioxide is decompressed and returns gas allowing the contaminant took off pieces to fall down and to be collected separectly.
Now CO2 can be drained off the machine or recovered to be used again.
One of the advantages of using liquid carbon dioxide is that only in this state can be hardly increased by mechanical actions. Morover liquid carbon dioxide, to treat particularly difficult contaminants, can be added with surfactants that increase the cleaning action.

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Liquid CO2 allows the removal of organic contaminants as treatment oils, greases and dust and can have a very good emplyment in motor, aeronautical, aerospace, medical fields, in the precision ….. where it is necessary to have very high cleaning standards. In several tests made (noodles, ball points of pens, welding torch tips)it has been found residuals less then a few micrograms per square centimetres.
It is less effective for what concernes the removal of inorganic contaminants as paints, rust, coating and many adhesives. Besides it cannot be used to treat pieces that could be damaged or deformed by hgh pressure.
The cooperation between Fismet Industriale, Sepaex and Air Liquide Italia has turned out very effective as Separex holds constantly Fismet Industriale under technical point of view having a great experience in the engineering of high pressure plants, while for what concernes CO2 to work with Carbonet Fismet Industriale works with the experience of air Liquide Ltalia, a leader company in the field of technical gas, that has carried out, on its experience a particular carbon dioxide quality with specifications suitable to be used with equipments working on precision industrial cleaning.

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