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MACHINERY LUBRICATION
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Particle Mobility
on Blotters
Soot, oxides and other
resinous (soft) insolubles in
certain oils exhibit a degree
of mobility (particle travel)
outward in a radial direction
from where the oil is intro-
duced to the blotter paper.
is can leave a recognizable
structure on the blotter.
Conversely, hard inorganic
particles such as wear debris
and dirt do not wick out into
the blotter paper well, with
the exception of the smallest
particles (e.g., less than 3
microns). is is due to the
high relative density of these
particles and their larger size.
L a rge pa r ticles set t le
quickly and are entrapped by
the tortuous texture of the
blotter media. Small particles
and those of low density can be
more easily transported radi-
ally by the oil. e distance
of their travel is dependent on
the particles' size, density and
shape, along with the viscosity
and density of the oil in which
they are suspended. Other
influencing factors include the
type of blotter paper, particle
polarity, certain additives (e.g.,
dispersants) and temperature
of the oil (when introduced),
as well as whether the blotter
is developed using a hot plate.
The limited mobility of
particles is a good thing when
their population in the oil is
