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Physical & Chemical properties

Particle size distribution (Granulometry)

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Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2021-12-20 - 2022-01-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2020
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
Version / remarks:
1981
GLP compliance:
yes (incl. QA statement)
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:
batch number of test material: J210224B00
Percentile:
D10
Mean:
0.7 µm
St. dev.:
0.1
Key result
Percentile:
D50
Mean:
2 µm
St. dev.:
0.1
Percentile:
D90
Mean:
5.1 µm
St. dev.:
0.1

Test series 1:
D10: 0.7 µm Standard deviation: < 0.1 µm
D50: 2.0 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 5.0 µm Standard deviation: 0.3 µm


 


Test series 2:
D10: 0.7 µm Standard deviation: < 0.1 µm
D50: 2.0 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 5.1 µm Standard deviation: 0.2 µm

Conclusions:
According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (non oil dispersed) was determined by laser diffraction measurement to be:
D50 = 2.0 µm
Executive summary:

In a guideline compliant GLP study according OECD TG 110 (1981) and ISO 13320 (2020) the particle size distribution of the substance 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (non oil dispersed) was measured using laser diffraction. From the measured diffraction pattern the particle size distribution is calculated. From the cumulative distribution the characteristic values are derived. Two test series of 3 measurements each were performed with the test item. The calculation of the average was carried out with the original not rounded values.


Test series 1:
D10: 0.7 µm Standard deviation: < 0.1 µm
D50: 2.0 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 5.0 µm Standard deviation: 0.3 µm


Test series 2:
D10: 0.7 µm Standard deviation: < 0.1 µm
D50: 2.0 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 5.1 µm Standard deviation: 0.2 µm


Average
D10: 0.7 µm Standard deviation: < 0.1 µm
D50: 2.0 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 5.1 µm Standard deviation: < 0.1 µm


 


According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (non oil dispersed) was determined by laser diffraction measurement to be:


D50 = 2.0 µm

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2021-12-20 - 2022-01-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2020
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
Version / remarks:
1981
GLP compliance:
yes (incl. QA statement)
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:
Batch No.: J201019B10
Percentile:
D10
Mean:
1.4 µm
St. dev.:
0.1
Key result
Percentile:
D50
Mean:
4.1 µm
St. dev.:
0.1
Percentile:
D90
Mean:
16.5 µm
St. dev.:
0.1

Test series 1:
D10: 1.3 µm Standard deviation: 0.1 µm
D50: 4.1 µm (Median diameter) Standard deviation: 0.1 µm
D90: 16.4 µm Standard deviation: 0.3 µm


 


Test series 2:
D10: 1.4 µm Standard deviation: < 0.1 µm
D50: 4.0 µm (Median diameter) Standard deviation: 0.1 µm
D90: 16.6 µm Standard deviation: 0.2 µm

Conclusions:
According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (oil dispersed) was determined by laser diffraction measurement to be:
D50 = 4.1 µm
Executive summary:

In a guideline compliant GLP study according OECD TG 110 (1981) and ISO 13320 (2020) the particle size distribution of the substance 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (oil dispersed) was measured using laser diffraction. From the measured diffraction pattern the particle size distribution is calculated. From the cumulative distribution the characteristic values are derived. Two test series of 3 measurements each were performed with the test item. The calculation of the average was carried out with the original not rounded values.


Test series 1:
D10: 1.3 µm Standard deviation: 0.1 µm
D50: 4.1 µm (Median diameter) Standard deviation: 0.1 µm
D90: 16.4µm Standard deviation: 0.3 µm


Test series 2:
D10: 1.4 µm Standard deviation: < 0.1 µm
D50: 4.0 µm (Median diameter) Standard deviation: 0.1 µm
D90: 16.6 µm Standard deviation: 0.2 µm


Average
D10: 1.4 µm Standard deviation: < 0.1 µm
D50: 4.1 µm (Median diameter) Standard deviation: < 0.1 µm
D90: 16.5 µm Standard deviation: 0.1 µm


 


According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (oil dispersed) was determined by laser diffraction measurement to be:


D50 = 4.1 µm

Description of key information

According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (non oil dispersed) was determined by laser diffraction measurement to be:


D50 = 2.0 µm


 


According to ISO 13320 (2020), OECD Test Guideline 110 (1981) and CIPAC Handbook K Test MT 187 the median particle size D50 of the test item 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione (oil dispersed) was determined by laser diffraction measurement to be:


D50 = 4.1 µm




Additional information