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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:
16 Oct 2017 to 16 Oct 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
equivalent or similar to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Principles of method if other than guideline:
Principle
The particle size distribution of different pigment sample dispersions was analysed by use of laser diffraction.


Method
- The Sympatec “SUCELL” automated closed loop wet dispersing unit is filled with fresh demineralized water and circulated by a peristaltic pump through a stainless steel flowthrough cuvette back into the water basin.
- The pigment sample is dosed into the “SUCELL” water basin and the dispersion is circulated until a stable readout of about 15% optical density is obtained
- The laser diffraction analysis is started and after completion the sample compartment water basin is emptied, thoroughly cleaned and refilled with fresh demineralized water for the next measurement.

Apparatus
- Sympatec Helos/BF (H1906) laser diffraction apparatus equipped with a “SUCELL” digital dispenser (ID 204, stainless steel flow-through cuvette Küv. 6015 with path length of 2mm) and Windox software version 5.9.00 (see Appendix for illustrations)
- Ultrapure water obtained from a water purification system from Millipore, Model Milli-Q Integral 15, S/N F9NN37849B with Q-POD remote dispenser S/N F9MN26892P
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Specific details on test material used for the study:
Product code: 278PE
Batch number: 170903
Key result
Percentile:
D10
Mean:
8.81 µm
St. dev.:
0
Remarks on result:
other:
Remarks:
Standard deviation not stated therefore entered as zero
Key result
Percentile:
D50
Mean:
69.99 µm
St. dev.:
0
Remarks on result:
other:
Remarks:
Standard deviation not stated therefore entered as zero
Key result
Percentile:
D90
Mean:
240.31 µm
St. dev.:
0
Remarks on result:
other:
Remarks:
Standard deviation not stated therefore entered as zero
Conclusions:
10% of the particles are below 8.81 μm, 50% of the particles are below 69.99 μm and 90% of the particles are below 240.31 μm.

Description of key information

D10 = 8.81 µm

D50 = 69.99 µm

D90 = 240.31 µm

Additional information