Potassium pentaborate

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:

21/06/2010 to 22/06/2010

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

Qualifier:

according to guideline

Guideline:

other: BS ISO 13320-1: 1999

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

other: CIPAC MT 187

Deviations:

not specified

GLP compliance:

yes

Type of method:

Laser scattering/diffraction

Type of distribution:

mass based distribution

Percentile:

D10

Mean:

352.094 µm

St. dev.:

6.09

Percentile:

D50

Mean:

568.631 µm

St. dev.:

7.33

Percentile:

D90

Mean:

909.937 µm

St. dev.:

12.89

Standard visual observation: Sample observed to be a coarse free flowing powder

Observation at 100 x magnifiation: The particles appeared to be irregular shaped crystals. The smallest particle size was approximately 20 μm and the largest size was approximately 768 μm.

Observation at 400 x magnification: The sample was made up of single crystalline particles.

Manual sieve analysis results:

Sieve size (μm)	Sieve weight (g)	Sieve + powder weight (g)	Powder weight (g)	% by weight
> 2000	325.8	325.9	0.1	0.1
< 2000	246	345.9	99.9	99.9
TOTALS			100	100

99.9 % by weight < 2000 μm.

Full test results:

	Run 1	Run 2	Run 3	Run 4	Run 5	** Average
Volume weighted mean	599.609	589.285	603.467	610.529	613.860	603.350
Median (d50)	572.124	554.417	569.622	572.028	575.130	568.631
Mode (μm)	584.028	555.683	573.231	569.358	572.047	570.741
*MMAD	739.947	716.464	736.114	739.223	743.232	734.833
10 % of material is >	346.341	344.052	352.866	357.332	359.813	352.094
50 % of material is >	572.124	554.417	569.622	572.028	575.130	568.631
90 % of material is >	906.855	888.631	907.866	920.856	925.540	909.937

All results are in μm

* Mass Mean Aerodynamic Diameter

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

0 % by volume of sample was seen to be < 10.00 μm.

 

Standard deviation results:

Run No.	1	2	3	4	5	STDVP	% STDV
d10	346.341	344.052	352.866	357.332	359.813	6.09	1.73
d50	572.124	554.417	569.622	572.028	575.130	7.33	1.29
d90	906.588	888.631	907.866	920.856	925.540	12.89	1.42
d15.78	386.778	379.651	389.637	393.463	396.008	5.69	1.46
GSD	1.479	1.40	1.462	1.454	1.452	0.01	0.65
MMAD	739.347	716.363	736.114	739.223	743.232	9.48	1.29

GSD = Geometric standard deviation.

0 % by volume of sample was seen to be < 10.0 μm.

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

Conclusions:

The d50 was shown to be 568.631 μm. Coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. This repeatability of the characteristic particles in the size distribution were within the aceptable limits as per the BS ISO 13320 -1 test standard.

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. Laser diffraction method was used. The d50 was shown to be 568.631 μm. Coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. This repeatability of the characteristic particles in the size distribution were within the aceptable limits as per the BS ISO 13320 -1 test standard.

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. Laser diffraction method was used. The d50 was shown to be 568.631 μm. Coefficient of variation for d50 was less than 3 %; d10 and d90 were less than 5 %. This repeatability of the characteristic particles in the size distribution were within the aceptable limits as per the BS ISO 13320 -1 test standard.