1. Is supercritical CO2 a new solvent ?

No, it has been used for several years in numerous extraction industrial processes: in coffee decaffeination, in cork treatment to remove cork taint, in sesame oil production, and also in medical domains, to impregnate implants or sterilize instruments.

2. Does the use of CO2 contribute to green- house effect ?

No, it doesn't. The CO2 we use comes from the release/waste recuperation (by-products) of the chemical industry which are recycled and then purified by gas-producer-operators as Air Liquide company (our partner). Our machines work in a closed-circuit: only around 10% of CO2 is released in the atmosphere.

3. Can solvent (CO2) traces remain in the treated material ?

No, carbon dioxide only exists in a gaseous state (as the air we breathe), that is why it isn't found at the end of the cleaning process.

4. Can CO2 cause damage or corrosion on the treated material ?

No, carbon dioxide is inert regarding metals and alloys to clean. Therefore, it doesn't present any risk.

5. Is supercritical CO2 the only degreasing agent in the machine ?

Currently, it is. Let's point out that the program of the machine will be adjusted to the degreasing of each type of parts: cleaning time, pressure and temperature will be adapted to reach the result of cleaning, as agitations, oscillations or the addition of ultra-sounds in the cleaning vessel.
In some specific cases, co-solvents can be used, as water or ethanol, as well as additives like surfactant agents or 'complexing' agents. We are currently working on the research of bio-based and biodegradable additives as a complement to the CO2 effect.

6. Can CO2 alone suppress all types of lubricants?

According to numerous tests, carbon dioxide alone is more efficient on soluble oils than on based mineral oils, some of which remain slightly CO2-soluble. That is why our research program is keeping going with the assessment of surfactant addition.

7.  Does the operations staff needs specific training to use a DFD machine?

As for any new material, the installation of a DFD machine will be subject to an appropriate training on site. DFD will teach the staff maintenance and production processes, as well as the use of Pressure-Equipments and the handling of the Distributed Control System.