In contrast to this desire for widespread penetrant testing, how-
ever, there is the general fear that components or welds tested
with the dye penetrant and which are used in the environment of
cryo-vacuum and particularly in the ultra-high vacuum conditions
are contaminated by the dye in such a way that they do not ful-
fill the cleanliness requirements for vacuum components. This fear
is mainly based on the high penetrating property of the dye and
its particular creeping characteristics, which just is the property
required for the test procedure. After the penetration test, how-
ever, the penetrant dye may remain in cavities like porosities or in
cracks and might cause virtual leaks during the evacuation and in
the vacuum, due to extended outgassing. As the penetrant dye pri-
marily consists of hydrocarbons, which are considered critical for
outgassing in fusion devices, a penetrant test of such vacuum com-
ponents is usually considered problematic. In this investigation we
In contrast to this desire for widespread penetrant testing, how-
ever, there is the general fear that components or welds tested
with the dye penetrant and which are used in the environment of
cryo-vacuum and particularly in the ultra-high vacuum conditions
are contaminated by the dye in such a way that they do not ful-
fill the cleanliness requirements for vacuum components. This fear
is mainly based on the high penetrating property of the dye and
its particular creeping characteristics, which just is the property
required for the test procedure. After the penetration test, how-
ever, the penetrant dye may remain in cavities like porosities or in
cracks and might cause virtual leaks during the evacuation and in
the vacuum, due to extended outgassing. As the penetrant dye pri-
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