AIRBORNE   PARTICULATE   CLEANLINESS   CLASSES

     

Class limits

   

Class Name

0.1 mm

0.2 mm

0.3 mm

0.5 mm

5 mm

 

Volume units

Volume units

Volume units

Volume units

Volume units

SI

English

m3

ft3

m3

ft3

m3

ft3

m3

ft3

m3

ft3

M 1

 

350

9.91

75.7

2.14

30.9

0.875

10.0

0.283

-

-

M 1.5

1

1240

35.0

265

7.50

106

3.00

35.3

1.00

-

-

M 2

 

3500

99.1

757

21.4

309

8.75

100

2.83

-

-

M 2.5

10

12400

350

2650

750

1060

30.0

353

10.0

-

-

M 3

 

35000

991

7570

214

3090

87.5

1000

28.3

-

-

M 3.5

100

-

-

26500

750

10600

300

3530

100

-

-

M 4

 

-

-

75700

2140

30900

875

10000

283

-

-

M 4.5

1000

-

-

-

-

-

-

35300

1000

247

7.00

M 5

 

-

-

-

-

-

-

100000

2830

618

17.5

M 5.5

10000

-

-

-

-

-

-

353000

10000

2470

70.0

M 6

 

-

-

-

-

-

-

1000000

28300

6180

175

M 6.5

100000

-

-

-

-

-

-

3530000

100000

24700

700

M 7

 

-

-

-

-

-

-

10000000

283000

61800

1750