COMPARISON OF AC SPARK PLUG
AND ISO 12103-1 TEST DUSTS
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COARSE TEST DUST COMPARISON
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Eight samples of ISO Coarse Test Dust
manufactured by Powder Technology Inc. and six samples
of AC Coarse manufactured by AC Spark Plug division of
General Motors Corp. were analyzed for comparison.
ISO Coarse Test Dust samples (formerly
SAE Coarse) analyzed are those used previously to determine
particle size limits shown in ISO 12103-1 Test Dust Standard.
ISO Coarse samples ID numbers 4420A, 4491E, 4445B, 4446C,
4452C, 4465B, 4491C and 4499C were analyzed. Graph E
indicates cumulative volume spread of ISO Coarse Test
Dust samples analyzed.
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ISO 12103-1, A4 Coarse Test Dust
(Microtrac X-100 Cumulative Volume)
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AC Spark Plug Coarse Test Dust samples
analyzed were selected randomly and included batch numbers
1418, 1474, 1484, 2071, 2507, and 2787. Graph F indicates
cumulative volume spread of AC Coarse samples analyzed.
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AC Coarse Test Dust
(Microtrac X-100 Cumulative Volume)
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ISO Coarse Test Dust sample analysis data was averaged,
as was AC Spark Plug Coarse data. Graph G compares cumulative
volume averages of ISO Coarse and AC Spark Plug Coarse.
Graph H compares differential volume averages of ISO
Coarse and AC Spark Plug Coarse Test Dusts.
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Comparison of Averages, Coarse Test Dust
(Microtrac X-100 Cumulative Volume)
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Comparison of Course Test Dust Differential Data
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Review of Graphs E and F indicate less
batch-to-batch variation in ISO Coarse samples as compared
to AC Spark Plug Coarse samples. Graphs G and H indicate
AC Spark Plug Coarse contains higher particle content
below 2.75 micron and above 74 micron than ISO Coarse
Test Dust. Inversely, ISO Coarse indicates higher particle
content between 2.75 micron and 74 micron. The median
particle size by volume of AC Spark Plug Coarse is 34.5
micron, whereas ISO Coarse median volume is 29.6 micron.
Generally speaking, AC Spark Plug Coarse is slightly
coarser than ISO Coarse Test Dust. Product testing performance
differences could be expected if ISO Coarse and AC Spark
Plug Coarse were used as part of the same test program.
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