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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:
03 May 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
other: ISO 13320
Deviations:
not specified
GLP compliance:
yes (incl. QA statement)
Type of method:
Laser scattering/diffraction
Key result
Percentile:
D10
Mean:
ca. 3.28 µm
Remarks on result:
other: Standard deviation is not reported
Key result
Percentile:
D50
Mean:
ca. 13.28 µm
Remarks on result:
other: Standard deviation is not reported
Key result
Percentile:
D90
Mean:
ca. 49.36 µm
Remarks on result:
other: Standard deviation is not reported

Results:

Additionally to the determination of the particle size distribution, the test item was examined microscopically to determine the shape of the particles. The particles of the white powder have the shape of crystalline rods.

Two test series of 3 measurements each were performed with the fine fraction of the test item. Figure 1 and Figure 2 show the results of both test series. On the left y-axis the fraction distribution and on the right y-axis the cumulative distribution is shown.

Test series 1 (figure 1):

L10: 3.27 µm

L50: 13.26 µm

L90: 49.17 µm

Test series 2 (figure 2):

L10: 3.29 µm

L50: 13.30 µm

L90: 49.55 µm

Average:

L10: 3.28 µm

L50: 13.28 µm

L90: 49.36 µm

The particle of the white powder have the shape of crystalline rods. The test item zinc methacrylate has a median particle size L50=13µm, which was determined by laser diffraction measurement. The validity of the measuring system is checked periodically by comparison and calibration with standard material. The validity criteria of the certified reference material is:

- dry dispersion with QAS3002: Obscuration: 0.5%<6.0%,residual:<2.0%

The apparatus Malvern Mastersizer with the accessory unit Scirocco 2000 passed the checks and calibrations. The values of the measured particle sizes, the obscuration and the residual met the validity criteria.

Conclusions:
The particle of the white powder have the shape of crystalline rods. The test item zinc methacrylate has a median particle size L50=13µm, which was determined by laser diffraction measurement.
Executive summary:

This study was performed in order to determine the particle size distribution of the test item zinc methacrylate according to the OECD 110 and ISO 13320 using the laser diffraction method. As measuring device, a Malvern Mastersizer 2000 was used. The powder was brought via a powder dispersing cell Scirocco 2000 into the laser light beam and the diffraction pattern was determined. From the diffraction pattern the particle size distribution was calculated. Two test series of 3 measurements each were performed with the fine fraction of the test item. The particle of the white powder have the shape of crystalline rods. The test item zinc methacrylate has a median particle size L50=13 µm (Moller, 2012).

Description of key information

The particle of the white powder have the shape of crystalline rods. The test item zinc methacrylate has a median particle size L50=13µm, which was determined by laser diffraction measurement.

Additional information

Key study was performed in order to determine the particle size distribution of the test item zinc methacrylate according to the OECD 110 and ISO 13320 using the laser diffraction method. Two test series of 3 measurements each were performed with the fine fraction of the test item. The particle of the white powder have the shape of crystalline rods. The test item zinc methacrylate has a median particle size L50=13 µm (Moller, 2012).