UV light resistance
DIN EN ISO 4892-2 and DIN EN ISO 60068-2-5
In addition to infrared radiation, the solar
radiation affecting the surface of the earth
has radiation ranges from the UV-A and
UV-B spectrum. Depending on the plastic
used, the UV-B part of the wavelength
of 320 nm induces a more or less
strong molecular decomposition that is
responsible for a considerable restriction
of the plastic's mechanical property
profile. Even the properties of printings
and labelings can undergo damage to a
greater or lesser extent due to this UV
radiation, resulting in fading which can
even lead to complete illegibility.
If plastics and their printings and labelings
are often subjected to day/night cycles
outdoors, condensation may appear on
the surface in the form of water droplets,
which can act similarly to magnifying
glasses when the sunshine returns, thus
intensifying the radiation effect. The UV-B
part of the solar spectrum in particular
leads to an impairment of the plastic's
mechanical property profile.
Marking materials from Phoenix Contact
can be stored in dry as well as humid
atmospheres under UV radiation and
are tested in accordance with the
aforementioned standards. The properties of
the plastic and the legibility of the printings
and labelings are checked after the test.
Aging test
IEC 60947-7-1/-2
Modular terminal blocks are characterized,
among other things, by long life cycles and
their ability to safely withstand continuous
temperatures of +125°C. In order to
ensure that the labeling of these terminal
blocks also meets these requirements,
Phoenix Contact uses labeling materials
with heat stabilizers.
To simulate usage over several years, the
marking materials are subjected to
temperature cycles together with the
terminal blocks or conductors in the
climate cabinet. The minimum
temperature in the climate cabinet is set
to 20°C and the maximum temperature to
120°C (80°C with PVC). The test objects
reach the maximum permissible operating
temperature during the warming phase
and the 10-minute pause phase. The
cooling down phase follows. The test
comprises a total of 192 cycles.
Temperature in
relation to time
Phoenix Contact marking materials are,
without exception, tested in accordance with
IEC 60947-7-1/-2. All plastics used also have
sufficient safety reserves.
T/°C
120
105
90
75
60
45
30
15
0
20 30
0
50 60
t/min
Cycle
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