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NASA, WHO GMP and FDA define the standard for the relation between the mark of class and the number of germs depending on particles.

 

Class of Cleanliness Level
Bacteria Floating on the Air (No./ft)
Dropping Bacteria
(No./ft .week)
100
0.1
1,200
10,000
0.5
6,000
100,000
2.5
30,000

 

Grade
Particle Concentration
Floating Bacteria Concentration
(CFU/)
0.5~5
5
A
3,500
0
1>
B
3,500
0
5
C
350,000
2,000
100
D
3,500,000
20,000
500


 
Particle Concentration
Floating Bacteria Concentration
(No/ ft )
Important Area
Class 100
0.1
Control Area
Class 100,000
2.5


Class of Cleanliness Level
FDA
NASA
WHO GMP
No/(No/ ft )
No/(No/ ft )
No/
A 100
-
-
1>
B 100
3,5(0.1)
3,5(0.1)
5
C 10,000
-
18(0.5)
100
D 100,000
88(2.5)
88(2.5)
500