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Clean Rooms - ISO Standard 14644

Clean room class limits according ISO Standard 14644-1.

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Clean rooms maintained virtually free of contaminants, such as dust or bacteria, are used in laboratory work and in the production of precision parts for electronics or aerospace equipment.

In the clean room standard ISO 14644-1 "Classification of Air Cleanliness" - the classes are based on the equation

C_n = 10^N (0.1 / D)^2.08 (1)

where

C_n = maximum permitted number of particles per cubic meter equal to or greater than the specified particle size, rounded to whole number

N = ISO class number - must be a multiple of 0.1 and be 9 or less

D = particle size in micrometers

Clean Rooms - Maximum Number of Particles in Air - ISO 14644
ISO Class	Maximum Number of Particles in Air (particles in each cubic meter equal to or greater than the specified size)
	Particle size
	> 0.1 μm	> 0.2 μm	> 0.3 μm	> 0.5 μm	> 1 μm	> 5 μm
ISO Class 1	10	2
ISO Class 2	100	24	10	4
ISO Class 3	1000	237	102	35	8
ISO Class 4	10000	2370	1020	352	83
ISO Class 5	100000	23700	10200	3520	832	29
ISO Class 6	1000000	237000	102000	35200	8320	293
ISO Class 7				352000	83200	2930
ISO Class 8				3520000	832000	29300
ISO Class 9				35200000	8320000	293000

clean room particles sizes iso standard diagram

ISO Clean room Standards

ISO-14644-1 Classification of Air Cleanliness
ISO-14644-2 Clean room Testing for Compliance
ISO-14644-3 Methods for Evaluating & Measuring Clean rooms & Associated Controlled Environment
ISO-14644-4 Clean room Design & Construction
ISO-14644-5 Clean room Operations
ISO-14644-6 Terms, Definitions & Units
ISO-14644-7 Enhanced Clean Devices
ISO-14644-8 Molecular Contamination
ISO-14698-1 Biocontamination: Control General Principles
ISO-14698-2 Biocontamination: Evaluation & Interpretation of Data
ISO-14698-3 Biocontamination: Methodology for Measuring Efficiency of Cleaning Inert Surfaces

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