4. Advantages and disadvantages

4.1 Benefits

Dense CO ₂ under pressure has very low surface tension and excellent wettability, making it very interesting for cleaning tortuous parts or parts with complex geometries, blind holes or multi-component assemblies. It has a critical temperature close to room temperature, which is an advantage when treating thermosensitive substrates such as certain polymers. Its low viscosity implies high Reynolds numbers during flow, which is positive for particle removal.

Its density, comparable to that of a liquid, makes it a good solvent for many low-molecular-weight organic and fluorinated compounds. Co-solvents, such as alcohols, surfactants (anionic, cationic and non-ionic), dispersants, and chelating compounds...

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Advantages and disadvantages

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page Principles of dense CO2 cleaning under pressure

Applications

Bibliography

(1) - KOHLI (R.) - Surface contamination removal using dense-phase fluids: Liquid and supercritical carbon dioxide. - In Developments in surface contamination cleaning, Elsevier, p. 2-38 (2013).
(2) - NASA Document JPR 5322.1 - Contamination...

Standards and norms

Clean rooms and related controlled environments – Part 1: Classification of air particulate cleanliness - ISO 14644-1 - 2015
Clean rooms and related controlled environments – Part 2: Monitoring the maintenance of cleanroom performance for particulate air cleanliness - ISO 14644-2 - 2000
Clean rooms and related controlled environments – Part 14: Assessment of equipment suitability for use by determining...

Regulations

Order of 11/20/17 on in-service monitoring of pressure equipment and simple pressure vessels. JO n° 282 of December 3, 2017.

Arrêté du 02/05/02 relatif aux prescriptions générales applicables aux installations classées pour la protection de l'environnement soumises à déclaration sous la rubrique n° 2345 relatives à l'utilisation de solvants pour le nettoyage à sec et le traitement des textiles ou des...