Airborne Classification in the European Union guide to
Good Manufacturing Pratice
Maximum Permitted Number of Particles /m3 equal
to or above
Grade
at rest
in operation
>= 0.5µm
>= 5.0µm
>= 0.5µm
>= 5.0 µm
A
3500
0
3500
0
B
3500
0
350000
2000
C
350000
2000
3500000
20000
D
3500000
20000
not defined
not defined
Note
Grade A and B correspond to with class 100, M 3.5, ISO 5
Grade C correspond to with class 10000, M 5.5, ISO 7
Grade D correspond to with class 100000, M 6.5, ISO 8
