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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:
2019-02-20 to 2019-02-25
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
not specified
GLP compliance:
no
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
other: sieving: mass based distribution; laser diffraction: volumetric distribution
Percentile:
other: Dv(10)
Mean:
43.756 µm
Remarks on result:
other: The distribution is volume related, i.e. a Dv (10) means that 10% of the particles have a diameter < 43.756 µm and 10% of the particles have a diameter > 43.756 µm.
Percentile:
other: Dv(50)
Mean:
137.638 µm
Remarks on result:
other: The distribution is volume related, i.e. a Dv (50) means that 50% of the particles have a diameter < 137.6 µm and 50% of the particles have a diameter > 137.6 µm
Percentile:
other: Dv(90)
Mean:
554.336 µm
Remarks on result:
other: The distribution is volume related, i.e. a Dv (90) means that 90% of the particles have a diameter < 554.336 µm and 90% of the particles have a diameter > 554.336 µm.
No.:
#1
Size:
>= 2 mm
Distribution:
88.64 %
No.:
#2
Size:
>= 1 - <= 2 mm
Distribution:
8.45 %
No.:
#3
Size:
>= 0.5 - <= 1 mm
Distribution:
1.7 %
No.:
#4
Size:
< 0.5 mm
Distribution:
1.21 %

Results mass based distribution:

First sieving over a 2 mm sieve

- The resulting material (11.36 % < 2 mm of the total sample) was then sieved over a 1 mm sieve.

- The resulting material (2.91 % < 1 mm of the entire sample) was then sieved over a 500 µm sieve.

Results from volumetric distribution ISO13320:

From the fraction smaller than 500 µm (1.21 % < 500 µm of the total sample), a dry particle size distribution was performed by laser diffraction (Malvern mastersizer 3000).

Name Dispersing medium: Dry dispersion       

Refractive index dispersing medium: 1.000       

Fraunhofer scattering model       

Analysis Mode: Universal       

Weighted variance: 0.33

Laser shadowing: 0.46 %

Concentration: 0.0054 %

Width: 3.710

Uniformity: 1.352

Specific surface: 65.08 mL/kg

Diameter (D) [3:2]: 92.198 µm

D [4:3]: 258.586 µm

Dv (10): 43.756 µm

Dv (50): 137.638 µm

Dv (90): 554.336 µm

The distribution is volume related, i.e. a Dv (50) means that 50% of the particles have a diameter < 137.6 µm and 50% of the particles have a diameter > 137.6 µm.

Conclusions:
Results from the hand sieve:
-       88.64 % of the particles are above 2 mm
-       8.45 % are above 1 mm and below 2 mm
-       1.71 % are above 0.5 mm and below 1 mm
-       1.21 % are below 0.5 mm

From the fraction smaller than 500 µm (1.21 % < 500 µm of the total sample) a volume related particle size distribution was recorded:
Dv (10): 43.756 µm
Dv (50): 137.638 µm
Dv (90): 554.336 µm (hand sieve error)
Executive summary:

Results from the hand sieve:

-       88.64 % of the particles are above 2 mm

-       8.45 % are above 1 mm and below 2 mm

-       1.71 % are above 0.5 mm and below 1 mm

-       1.21 % are below 0.5 mm

From the fraction smaller than 500 µm (1.21 % < 500 µm of the total sample) a volume related particle size distribution was recorded:

Dv (10): 43.756 µm

Dv (50): 137.638 µm

Dv (90): 554.336 µm (hand sieve error)

Description of key information

Results from the hand sieve:

-       88.64 % of the particles are above 2 mm

-       8.45 % are above 1 mm and below 2 mm

-       1.71 % are above 0.5 mm and below 1 mm

-       1.21 % are below 0.5 mm

From the fraction smaller than 500 µm (1.21 % < 500 µm of the total sample) a volume related particle size distribution was recorded:

Dv (10): 43.756 µm

Dv (50): 137.638 µm

Dv (90): 554.336 µm (hand sieve error)

Additional information