Labconco Precise HEPA-Filtered Glove Boxes 5220231 - Manual (Page 9)

Chapter 2: Prerequisites
Product Service 1-800-522-7658 5
Precise HEPA-Filtered Glove Box Particle Testing under Positive Pressure
0
139
18
8
0
0
306
12
2 1 0 0
50
100
150
200
250
300
350
400
450
500
0 1 2 3 4 5 6
Time (Minutes)
N
u
m
b
er
o
f P
ar
tic
le
s
(P
er
C
u
b
ic M
ete
r P
er
M
in
u
te)
> 0.3 Micron
> 0.5 Micron
Airflow Testing Performed at 50 Dial Setting (61 CFM)
with Glove Box Under Positive Pressure.
NOTE: Ambient Air Baseline Particle Count at 1 Minute
198671 Particles measuring 0.3 Micron detected within 1 Minute.
25473 Particles measuring 0.5 Micron detected within 1 Minute.
ISO Class 3 Definition
Airborne particulate cleanliness inside any clean air glove box or enclosure is
designated by ISO Class 3, which is equivalent to 35 particles 0.5 µm or
larger per cubic meter of air per minute as defined by ISO Standard 14644-1.
ISO Class 3 cleanliness is illustrated in the table below and is equivalent to
Class 1 air conditions as defined by Federal Standard 209E or l particle 0.5
µm or larger per cubic foot of air per minute.
Table 1-1 Selected airborne particulate cleanliness classes for cleanrooms and clean zones.
ISO
classification
number (N)
Maximum concentration limits (particles/m 3 of air/minute) for particles equal to
and larger than the considered sizes shown below (concentration limits are
calculated in accordance with 3.2 of Standard 14644-1)
0.1 µm 0.2 µm 0.3 µm 0.5 µm 1 µm 5 µm
ISO Class 1 10 2
ISO Class 2 100 24 10 4
ISO Class 3 1 000 237 102 35 8
ISO Class 4 10 000 2 370 1 020 352 83
ISO Class 5 100 000 23 700 10 200 3 520 832 29
ISO Class 6 1 000 000 237 000 102 000 35 200 8 320 293
ISO Class 7 352 000 83 200 2 930
ISO Class 8 3 520 000 832 000 29 300
ISO Class 9 35 200 000 8 320 000 293 000
Table 2-1 ISO Classification Number (N)