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Cleanroom Particle Counter Background (cont'd)...
ISO 14644-1 has replaced standards worldwide, though it is similar to Federal Standard 209E.  The major changes are as follows:

  • ISO creates 0.1um as the "Standard" Diameter
  • Air volume is measured in metric units
  • ISO establishes three new cleanliness classes -
    • Two "Cleaner" classes (ISO class 1 and ISO class 2) than Federal Standard 209E
    • One "Dirtier" Class (ISO Class 9) which is allows more particulate than Fed Standard 209E class 100,000
  • Allows for discarding of "Outliers" - Federal Standard 209E did not.  This is explained below.

Critical Environment Classification

Concentration (particles/meter©ø) > or = Size Shown

FS 209E

ISO 14644-10.1 ¥ìm0.2 ¥ìm0.3 ¥ìm0.5 ¥ìm1.0 ¥ìm5.0 ¥ìm
N/A1102    
N/A210024104  
131,000237102358 
10410,0002,3701,02035283 
1005100,00023,70010,2003,52083229
1,00061,000,000237,000102,00035,2008,320293
10,0007   352,00083,2002,930
100,0008   3,520,000832,00029,300
N/A9   35,200,0008,320,000293,000

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