ISO
QUALITY CLASS

SOLID / DIRT
Particle size in micron

WATER @ 100 psi

Pressure Dewpoint

OIL

(including vapor)

° C

° F

Mg /m³

PPM

0

As specified

As specified

As specified

1

0.1

-70

-94

0.01

0.008

2

1

-40

-40

0.1

0.08

3

5

-20

-4

1

0.8

4

15

+3

+38

5

4

5

40

+7

+45

25

21

6

-

+10

+50

-

-

Air Quality Recommended Standards

Applications Classes

Typical Quality Classes

Dirt

Water

Oil

Air agitation

5

3

3

Air bearings

2

3

2

Air gauging

3

3

2

Air motors

2

5

4

Brick & glass machines

4

5

4

Cleaning of machine parts

4

4

4

Construction

5

5

4

Conveying, granular products

4

3

3

Conveying, powder products

3

2

2

Fluidics, power circuits

4

4

4

Fluidics, sensors

1

2

2

Foundry machines

4

5

4

Food & beverages, direct air contact

2

2

1

Food & beverages, NOT direct air contact

2

4

1

Hand operated tools

5

5

4

Machine tools

3

5

4

Mining

5

5

4

Micro-electronics manufacture

1

1

1

Packaging and textile machines

3

4

4

Photographic film processing

1

1

1

Pneumatic cylinders

4

4

4

Pneumatic tools

4

4

4

Process control instruments

2

4

2

Paint spraying

3

4

3

Sand blasting

3

3

5

Welding machines

4

5

4

General workshop air

4

5

4