AS/NZS ISO 14644.1:2002

This part of ISO 14644 covers the classification of air cleanliness in cleanrooms and associated controlled environments exclusively in terms of concentration of airborne particles. Onlyparticlepopulationshavingcumulativedistributionsbased on threshold (lower limit) sizes ranging from 0,1 mm to 5 mm are considered for classification purposes.This part of ISO 14644 does not provide for classification of particle populations that are outside of the specified particle size range, 0,1 mm to 5 mm. Concentrations of ultrafine particles (particles smaller than 0,1 mm) and macroparticles (particles larger than 5 mm) may be used to quantify these populations in terms of U descriptors and M descriptors, respectively.This part of ISO 14644 cannot be used to characterize the physical, chemical, radiological, or viable nature of airborne particles.NOTE The actual distribution of particle concentrations within incremental size ranges normally is not predictable and typically is variable over time.

First published as part of AS 1386-1976 and AS 1387-1976.Revised and redesignated in part as AS 1386.1-1989.Jointly revised and redesignated in part as AS/NZS ISO 14644.1:2002. First published as part of AS 1386-1976 and AS 1387-1976. Revised and redesignated in part as AS 1386.1-1989. Jointly revised and redesignated in part as AS/NZS ISO 14644.1:2002.