1. Definition of cleanliness levels

Before discussing the CO ₂ pressure cleaning process, it's essential to address the notion of cleanliness. Surface contamination exists in many forms and is present in different states on the surface of a substrate. Among the most common categories are particles, thin or molecular films, organic or inorganic bodies, ionics, and bacteriological contamination. This list can be extended to metals, chemical compounds (toxic and hazardous), and radioactive or biological particles, encountered in various industrial processes such as semiconductor production, metal machining, the manufacture of polymer objects, the nuclear industry, the pharmaceutical and medical industries, or the food industry.

The most common sources of contamination include :

machining oils and greases ;...

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Definition of cleanliness levels

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Dense fluids under pressure

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...