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EC number: 273-728-1
CAS number: 69012-28-8
By-product of the manufacture of ferromanganese alloy containing primarily oxides of aluminum, manganese and silicon.
The results of the sieving procedure are shown in the following table:
Sieve aperture size (µm)
Mass of test material transferred to sieve (g)
Mass of test material passed through sieve (g)
Test material less than sieve aperture size (%)
The particle size of the test material was determined following the
screening study as outlined in the standardised guideline OECD 110.
On visual assessment the test material was observed to be composed of
rocks of various sizes from approximately 10 cm to <1 cm plus some dust.
To represent a worst case scenario for potential inhalation risk the
larger particles were removed and only smaller particles and dust were
sub-sampled. From this sub-sample the percentage of test material with a
particle size of <100 µm was calculated by sieve analysis. A
representative portion of this sub-sample (14.41 g) was sieved for
approximately 30 minutes on an Inclyno sieve shaker using a 100 µm
sieve. The mass of the test material passing through the sieve was
From a sub-sample of the test material the percentage of material with a
particle size less than 100 µm was determined to be 3.3%. This indicated
that the test material was of a particle size that was essentially
non-inhalable. It must be noted that this value is a significant
overestimate of the true fine particle fraction of the test material due
to the sampling procedure.
The proportion of test material having an inhalable particle size less than 100 µm was below 3.3 % w/w, OECD 110 sieve method, Butler & O'Connor (2009)
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