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Aerospace. Hydraulic fluid components. Expression of particulate contamination levels Ingestion-build-224916 Who is BS EN 625091 Scope This International Standard defines the method of reporting and communicating the contamination (or cleanliness) level of components used in aerospace fluid systems. It also presents a coding system which allows cleanliness data to be reported, both in a shortened manner and in a complete manner, when communicating for reporting contamination level measurement results and for specifying cleanliness requirements.