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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Version / remarks:
sieving
Qualifier:
according to
Guideline:
other: ASTM C136
Qualifier:
according to
Guideline:
other: AASHTO T 27
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
other: sieving
Test material information:
Composition 1
Mass median aerodynamic diameter:
ca. 20 µm
Remarks on result:
other: standard deviation not measured -- no statitisc values
Percentile:
D10
Mean:
ca. 20 µm
Remarks on result:
other: St deviation not known
Percentile:
D50
Mean:
ca. 60 µm
Remarks on result:
other: St deviation not known
Percentile:
D90
Mean:
460 µm
Remarks on result:
other: st deviation not known
No.:
#1
Size:
>= 1 000 µm
Distribution:
ca. 1.2 %
No.:
#2
Size:
>= 500 - < 1 000 µm
Distribution:
ca. 12.8 %
No.:
#3
Size:
>= 250 - < 500 µm
Distribution:
ca. 12.4 %
No.:
#4
Size:
>= 160 - < 250 µm
Distribution:
ca. 2.8 %
No.:
#5
Size:
>= 63 - < 160 µm
Distribution:
ca. 28 %
No.:
#6
Size:
>= 40 - < 63 µm
Distribution:
ca. 36 %
No.:
#7
Size:
> 40 µm
Distribution:
ca. 6.8 %
Conclusions:
According to a granulometry study (sieving) OECD 110, the mean diameter of DBTU is about 60 um, D10 equals 20 um and D90um is 460 um

Since the inhalable fraction is 42.8% (i.e. 428 000mg/kg >> 5000 mg/kg), DBTU is considered as having extremely fine particles.

Description of key information

According to a granulometry study (sieving) OECD 110, the mean diameter of DBTU  is about 60 um, D10 equals 20 um and  D90um is 460 um

Since the inhalable fraction is 42.8% (i.e.  428 000mg/kg >> 5000 mg/kg), DBTU is considered as having extremely fine particles.

Additional information