COMPARISON OF AC SPARK PLUG
AND ISO 12103-1 TEST DUSTS
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FINE TEST DUST COMPARISON
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Seven samples of ISO Fine Test Dust
manufactured by Powder Technology Inc. and six samples
of AC Fine Test Dust manufactured by AC Spark Plug division
of General Motors were analyzed for comparison.
The ISO Fine samples (formerly SAE Fine)
selected are those previously used to determine particle
size limits shown in ISO 12103-1 Test Dust Standard.
ISO Fine batch ID numbers are 4377B, 4382A, 4400B, 4402B,
4422B, 4443A, and 4492B. Graph A indicates the cumulative
volume spread of ISO Fine samples analyzed.
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ISO 12103-1, A2 Fine Test Dust Grades
(Microtrac X-100 Cumulative Volume)
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AC Spark Plug Fine Test Dust samples analyzed
were selected randomly and included batch ID numbers
054, 258, 520, 958, 1125, and 1472. Graph B indicates
the cumulative volume spread of AC Spark Plug Fine samples
analyzed.
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AC Fine Test Dust
(Microtrac X-100 Cumulative Volume)
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ISO Fine sample data was averaged, as was AC Spark Plug
Fine sample data. Graph C compares the cumulative volume
average of the two types of Fine Test Dust. Graph D compares
differential volume averages of ISO Fine and AC Spark
Plug Fine samples analyzed.
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Comparison of Averages, Fine Test Dust
(Microtrac X-100 Cumulative Volume)
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Comparison of Fine Test Dust Differential Data
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Review of Graphs A and B indicate a narrower spread
among ISO Fine Test Dust samples as compared to AC Spark
Plug Fine Test Dust samples. From this, we may assume
that test results accumulated using ISO Fine Test Dust
should be more consistent over time than those accumulated
using AC Spark Plug Fine Test Dust. Graphs C and D indicate
significant differences in particle size between the
two types of dust. There is an increase in particle content
below 1.5 microns and above 9 micron size when comparing
AC Spark Plug Fine Test Dust to ISO Fine Test Dust. Inversely,
ISO Fine has an increase in particle content between
1.5 and 9 micron size. The median particle size of AC
Spark Plug Fine Test Dust is 10.65 micron, whereas, ISO
Fine median particle size is 7.01 micron. Significant
differences such as these could translate to performance
differences when testing some products.
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