Magnesium potassium titanium oxide

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:

From 4 December 2000 to 15 December 2000

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Principles of method if other than guideline:

According to REACH Regulation (EC) No 1907/2006 Article 13(3) tests on substances shall be conducted in accordance with the test methods laid down in a Commission Regulation or in accordance with other international test methods recognised by the Commission or the Agency as being appropriate. No particle size distribution test method is laid down in the relevant Regulation (EC) No 440/2008. The international OECD 110 test guideline ‘Particle Size Distribution/FibreLength and Diameter Distributions’ dates from 1981 and describes two methods in detail; both methods have restrictions and are not applicable to the entire size range. ECHA’s document ‘Guidance on information requirements and Chemical SafetyAssessment-Chapter R.7a: Endpoint specific guidance’ stipulates that many methods are available for particle size measurements but none of them is applicable to the entire size range. ECHA’s guidance mentions the Laser scattering/diffraction as a method suitable for particles of all kind and makes reference to ISO 13320.

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:

Relative density at 20°C: 3.42

Mass median aerodynamic diameter:

14.4 µm

Remarks on result:

other: MMAD was calculated from the relative density and D50. Geometric standard deviation: no data.

Key result

Percentile:

D10

Mean:

2.397 µm

Remarks on result:

other: Details: see table below

Percentile:

other: D25

Mean:

4.702 µm

Remarks on result:

other: Details: see table below

Key result

Percentile:

D50

Mean:

7.792 µm

Remarks on result:

other: Details: see table below

Percentile:

other: D75

Mean:

11.38 µm

Remarks on result:

other: Details: see table below

Key result

Percentile:

D90

Mean:

14.79 µm

Remarks on result:

other: Details: see table below

Calculations from 0.100 µm to 900 µm.

D10, D25, D50, D75 and D90 results reported above are the average of three runs.

Other results:

	Run 1	Run 2	Run 3	Mean
Volume %	100	100	100	100
Mean [µm]	5.806	6.604	5.929	6.103
Median [µm]	7.521	8.030	7.837	7.792
Mode  [µm]	9.928	9.928	9.928	9.928
95% conf limit  [µm]	0.769 -43.8	0.659 -66.2	0.747 -47.1	0.719 -51.8
s.d.	2.8	3.24	2.88	2.98

Conclusions:

Particle size distribution of the substance Terracess P: D10= 2.397 µm; D50= 7.792 µm; D90= 14.79 µm; MMAD= 14.4 µm.

Executive summary:

The substance Terracess P was visually observed to be a white powder. Under a microscope, the substance was observed to be made up of single crystalline particles. The particle size distribution was determined using laser diffraction analysis ('Wet' small volume dispersion method) in a GLP study according to ISO 13320. Each result is the average of three runs. Particle size distribution of the substance Terracess P: D10= 2.397 µm; D50= 7.792 µm; D90= 14.79 µm; MMAD= 14.4 µm.

Description of key information

Particle size distribution of Terracess P (laser diffraction analysis- 'wet' small volume dispersion method): D10= 2.397 µm; D50= 7.792 µm; D90= 14.79 µm; MMAD= 14.4 µm.