Hydac CTU 1 3 Series, Operating And Maintenance Instructions Manual

Page: 99 / 124

HYDAC FILTER SYSTEMS GMBH Carrying out the maintenance / inspection | 7
BeWa CTU1x3x-CTU1x4x 4093420f en-us web 99 / 124
7.13.1 Permeation time according to EN 374-3
The EN 374-3 standard pertains to determining the resistance pro-
vided by the material of protective gloves against the permeation
of nongaseous, potentially hazardous chemicals when subjected
to continuous contact.
For each chemical, the combinations of protective glove/test
chemical are classified according to their penetration time in which
the glove prevents permeation.
The protection index indicated is based on the penetration time
determined during constant contact with the test chemical under
customary laboratory conditions as specified in EN374-3. The ac-
tual duration of protection at the workplace may deviate consider-
ably from this protection index.
EN 374-3 Specification of the results:
Assuming permeation takes place, the penetration time is given in
minutes for each test sample. The average penetration time for
each type of material is also indicated. The duration of testing is
given if no penetration occurs.
This means that when the user is constantly exposed to the chem-
ical it takes a minimum of 1 µg / minute x cm² to permeate the
glove and come into contact with the user's skin.
Standard EN374 divides gloves into six classes, Class 6 being the
highest and most resistant. During testing, the glove is completely
immersed in the medium. No documentation of resistance of > 480
min. takes place.
Protection Index
Class 1 Class 2 Class 3 Class 4 Class 5 Class 6
> 10 min-
utes > 30 min-
utes > 60 min-
utes > 120
minutes > 240
minutes > 480
minutes
For exam-
ple: For exam-
ple: For exam-
ple: For exam-
ple: For exam-
ple: For exam-
ple:
… … … … … …
Acetone Benzalde-
hyde Napthabe
nzene n-heptane Isooctane Formic
acid, 10%
Benzene Nitroben-
zene Anilene Ethyl alco-
hol Ethylene
diamine Ammonia,
10%
1
2
3
4
5
6
7
8
9
A