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Numerical abbreviation summarizing the difference in cleanliness classification between two areas as ensured by a separative enclosure under defined test conditions, where: A = ISO class inside; a = particle size at which A is measured; B = Iso class outside; b = particle size at which B is measured. ISO 14644-7.
Publication Source: ISO/TC209 Working Groups at 2001-03-31 – Committee Draft ISO/CD 14644-6 “Cleanrooms and associated controlled environments” – Part 6: Terms and Definitions
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