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Home
> Clean room > The Level of
Cleanliness
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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.
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| Class of Cleanliness
Level |
Bacteria Floating on
the Air (No./ft³) |
Dropping Bacteria
(No./ft³ .week) |
| 100 |
0.1 |
1,200 |
| 10,000 |
0.5 |
6,000 |
| 100,000 |
2.5 |
30,000 |
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| 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 |
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Particle
Concentration |
Floating
Bacteria Concentration
(No/ ft³ ) |
Important Area |
Class 100 |
0.1 |
Control Area |
Class 100,000 |
2.5 |
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| Class
of Cleanliness Level |
FDA |
NASA |
WHO
GMP |
| No/㎥(No/
ft³ ) |
No/㎥(No/
ft³ ) |
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 |
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