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Helmke Garment Cleanliness Classification Chart (IEST-RP-CC003.3)
Particle emission rate, G particles/min
Category Garment Type 0.3 µm and larger 0.5 µm and larger
I
I
I
1 Frock
1 Coverall
3 Hoods
Less than 1,700
Less than 2,000
Less than 780
Less than 1,000
Less than 1,200
Less than 450
II
II
II
1 Frock
1 Coverall
3 Hoods
1,700 to 17,000
2,000 to 20,000
780 to 7,800
1,000 to 10,000
1,200 to 12,000
450 to 4,500
III
III
III
1 Frock
1 Coverall
3 Hoods
17,000 to 170,000
20,000 to 200,000
7,800 to 78,000
10,000 to 100,000
12,000 to 120,000
4,500 to 45,000
Tables / Charts
Helmke Drum Table
Note: The particle emission rates shown for each of the garment types are proportional to the
respective areas of fabric involved. The areas of the garments considered in the preparation
of this table are as follows:
Garment Type
Average area, m
2
(both sides)
Average area, ft
2
(both sides)
Frock*
Coverall*
Hood*
4.63
5.99
1.03
49.8
64.4
11.0
Class
maximum particles/m³
FED STD
209E
equivalent
≥0.1 µm ≥0.2 µm ≥0.3 µm ≥0.5 µm ≥1 µm ≥5 µm
ISO 1 10 2
ISO 2 100 24 10 4
ISO 3 1,000 237 102 35 8 Class 1
ISO 4 10,000 2,370 1,020 352 83 Class 10
ISO 5 100,000 23,700 10,200 3,520 832 29 Class 100
ISO 6 1,000,000 237,000 102,000 35,200 8,320 293 Class 1,000
ISO 7 352,000 83,200 2,930 Class 10,000
ISO 8 3,520,000 832,000 29,300 Class 100,000
ISO 9 35,200,000 8,320,000 293,000 Room Air
Cleanroom Classifications
