Pentaboron sodium octaoxide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15/06/2010 - 16/06/2010

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

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 13320-1:999

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:

determination of fibre length and diameter distributions

Type of distribution:

volumetric distribution

Percentile:

D90

Mean:

424.293 µm

St. dev.:

5.65

Percentile:

D10

Mean:

52.462 µm

St. dev.:

0.25

Percentile:

D50

Mean:

170.849 µm

St. dev.:

1.87

Full test results:

	Run 1	Run 2	Run 3	Run 4	Run 5	** Average
Volume weighted mean	206.472	208.131	210.343	218.379	211.471	210.959
Median (d.50)	171.086	171.984	173.583	168.267	169.448	170.849
Mode (μm)	184.988	184.414	187.289	174.668	177.405	181.244
*MMAD	222.411	223.580	225.658	218.747	220.282	222.103
10 % of material was <	52.358	52.648	52.859	52.287	52.168	52.462
50 % of material was <	171.086	171.984	137.583	168.267	169.448	170.849
90 % of material was <	416.444	420.596	425.418	432.336	428.670	424.293

All results are in μm.

* Mass Mean Aerodynamic Diameter

** Average result was calculated from the entirety of the data captured in each run and is not a simple arithmetic mean.

1.61 % by volume of sample was seen to be < 10.00 μm.

Standard deviation results:

Run No.	1	2	3	4	5	STDVP	% STDV
d10	52.358	52.648	52.859	52.287	52.168	0.25	0.48
d50	171.086	171.984	173.583	168.267	169.448	1.87	1.09
d90	416.444	420.596	425.418	432.336	428.670	5.65	1.33
d15.78	72.630	73.120	73.520	72.770	72.530	0.36	0.50
GSD*	2.356	2.352	2.361	2.312	2.336	0.02	0.75
MMAD	222.411	223.580	225.658	218.747	220.282	2.43	1.09

* GSD = Geometric standard deviation

Coefficient of variation for d50 is less than 3 %; d10 and d90 are less than 5 %. Thus repeatability of the characteristic particles in the size distribution are within the acceptable limits as per the BS ISO 13320 -1 test standard.

Conclusions:

The particle size distribution of sodium pentaborate granular was assessed according to BS ISO 13320-1:1999 and CIPAC MT 187. The coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. Thus repeatability of the characteristic particles in the size distribution were within the acceptable limits as per the BS ISO 13320-1 test standard. The median (d50) was 170.849 μm.

Executive summary:

The particle size distribution study was performed according to BS ISO 13320-1: 1999, CIPAC MT 187 and OECD guideline 110 under GLP compliance. Determination of fibre length and diameter distributions method was used. The coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. The median (d50) was 170.849 μm.

Description of key information

The particle size distribution study was performed according to BS ISO 13320-1: 1999, CIPAC MT 187 and OECD guideline 110 under GLP compliance. Determination of fibre length and diameter distributions method was used. The coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. The median (d50) was 170.849 μm.