Clean Rooms - ISO Standard 14644
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
Cn = 10N (0.1 / D)2.08 (1)
where
Cn = 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
| 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 | |||
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
Related Topics
• Ventilation Systems
Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
Related Documents
Clean Rooms - Federal Standard 209
Clean rooms virtually free of contaminants like dust or bacteria.
ISO - International Organization for Standardization
ISO - the International Organization for Standardization.
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Particle Sizes
The size of dust particles, pollen, bacteria, virus and many more.
Parts per Million - ppm
ppm - or parts per million - is commonly used as a unit of concentration.