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EC number: 233-139-2 | CAS number: 10043-35-3
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010-6-02
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- other: BS ISO 13320-1:1999
- Deviations:
- not specified
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC MT 187
- Deviations:
- not specified
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
- Deviations:
- not specified
- GLP compliance:
- yes
- Type of method:
- other: Optical microscope analysis and Laser diffraction particle size analysis
- Type of distribution:
- volumetric distribution
- Percentile:
- D50
- Mean:
- 74.395 µm
- St. dev.:
- 0.78
- Conclusions:
- Coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. Therefore repeatability of the characteristic particles in the size distribution were within the acceptable limits as per the BS ISO 13320 -1 test standard.
- Executive summary:
A study performed according to GLP, BS ISO 13320-1:1999 and CIPAC MT 187; and equivalent to OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) gave a mean d50 of boric acid of 74.395 μm.
Reference
Test results (in μm):
|
Run 1 |
Run 2 |
Run 3 |
Run 4 |
Run 5 |
* Average |
Volume weighted mean |
84.998 |
84.617 |
112.580 |
109.384 |
91.332 |
96.582 |
Median (d. 50) |
73.967 |
73.626 |
75.100 |
75.574 |
73.768 |
74.395 |
Mode (μm) |
76.908 |
76.520 |
76.677 |
77.288 |
76.372 |
75.749 |
10 % of material is < |
33.517 |
33.569 |
34.156 |
33.950 |
33.396 |
33.715 |
50 % of material is < |
73.967 |
73.626 |
75.100 |
75.574 |
73.768 |
74.395 |
90 % of material is < |
148.059 |
146.765 |
157.421 |
158.861 |
149.441 |
151.807 |
* Average result is calculated from the entirety of data captured in each run and is not a simple arithmetic mean.
1.48 % by volume of sample was seen to be < 10.00 μm.
Standard deviation results:
|
Run 1 |
Run 2 |
Run 3 |
Run 4 |
Run 5 |
Stdev |
%STDV |
D10 |
33.517 |
33.569 |
34.156 |
33.950 |
33.396 |
0.29 |
0.85 |
D50 |
73.967 |
73.626 |
75.521 |
75.574 |
73.768 |
0.78 |
1.05 |
D90 |
148.059 |
146.765 |
157.521 |
158.861 |
149.441 |
5.04 |
3.31 |
D15.78 |
2.750 |
2.710 |
2.590 |
2.720 |
2.740 |
0.06 |
2.14 |
GSD |
26.897 |
27.168 |
28.996 |
27.785 |
26.923 |
0.79 |
2.86 |
GSD = Geometric standard deviation.
Coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. Therefore repeatability of the characteristic particles in the size distribution were within the acceptable limits as per the BS ISO 13320 -1 test standard.
Description of key information
A study performed according to GLP, BS ISO 13320-1:1999 and CIPAC MT 187; and equivalent to OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) gave a mean d50 of boric acid of 74.395 μm.
Additional information
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