13-ethyl-11-methylene-gon-4-ene-3,17-dione

Particle size distribution (Granulometry)

Administrative data

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10 July 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

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

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 June 2020 - 29 July 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

2012

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)

Version / remarks:

2002

Deviations:

no

GLP compliance:

yes

Type of method:

air comparison pycnometer (for solids)

Specific details on test material used for the study:

TREATMENT OF TEST MATERIAL PRIOR TO TESTING

The test item was dried in a desiccator under vacuum using silica gel as the drying agent at 21.5 ± 1.3°C protected from light for 44 hours.

Dynamic viscosity of test material:

not applicable (substance is a solid)

Key result

Type:

relative density

Density:

1.17 other: dimensionless

Temp.:

20 °C

Remarks on result:

other: D 20 /4

Key result

Type:

density

Density:

1.17 g/cm³

Temp.:

20 °C

Relative density:

Experiment 1: 1.167

Experiment 2: 1.166

Mean: 1.17

Conclusions:

The relative density D20/4 of the substance was determined to be 1.17.

Executive summary:

The relative density of the substance was determined in a GLP study according to EC A.3, OECD 109 and OPPTS 830.7300 (method:air comparison pycnometer (for solids)).

A gas comparison pycnometer was used with helium as the gas. The relative density D20/4 was determined in duplicate obtaining a mean value of 1.17.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Version / remarks:

2009

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: CIPAC MT 187 (Particle size analysis by laser diffraction)

Version / remarks:

Handbook K, 2007

Principles of method if other than guideline:

According to REACH 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 regulation (EC) No 440/2008. OECD 110 TG ‘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 Guidance on information requirements and Chemical Safety Assessment-Chapter R.7a stipulates that many methods are available for particle size measurements but none of them is applicable to the entire size range. The guidance mentions Laser scattering/diffraction as a method for particles of all kind and makes reference to ISO 13320:2009.

According to Guidance document EUR 20268 (2002), the laser diffraction technique is applicable to particles of respirable and inhalable size. The MMAD can be calculated when density is known.

GLP compliance:

yes

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Test material

Test material information

Constituent 1

Reference substance name:

(3aS,3bS,9aR,9bS,11aS)‐11a‐ethyl‐10‐methylidene‐1H,2H,3H,3aH,3bH,4H,5H,7H,8H,9H,9aH,9bH,10H,11H,11aH‐cyclopenta[a]phenanthrene‐1,7‐dione

Cas Number:

54024-17-8

Molecular formula:

C20 H26 O2

IUPAC Name:

(3aS,3bS,9aR,9bS,11aS)‐11a‐ethyl‐10‐methylidene‐1H,2H,3H,3aH,3bH,4H,5H,7H,8H,9H,9aH,9bH,10H,11H,11aH‐cyclopenta[a]phenanthrene‐1,7‐dione

Test material form:

solid: particulate/powder

Details on test material:

Storage Conditions: In refrigerator (2-8°C)

Specific details on test material used for the study:

Relative density: 1.17 (see Cross-reference)

Results and discussion

Mass median aerodynamic diameter:

218 µm

Geometric standard deviation:

2.743

Remarks on result:

other: GSD above is the average of 5 runs. MMAD is calculated from relative density and mean D50.

Particle size

Particle size 1

Key result

Percentile:

D10

Mean:

44.8 µm

St. dev.:

0.266

Remarks on result:

other: The St. dev. is the population standard deviation [µm].

Particle size 2

Key result

Percentile:

D50

Mean:

202 µm

St. dev.:

1.4

Remarks on result:

other: The St. dev. is the population standard deviation [µm].

Particle size 3

Key result

Percentile:

D90

Mean:

547 µm

St. dev.:

15.6

Remarks on result:

other: The St. dev. is the population standard deviation [µm].

Particle size distribution at different passages

No.:

#1

Size:

< 10 µm

Distribution:

0.9 other: vol%

Any other information on results incl. tables

Coefficient of variation for D50 is < 3%; D10 and D90 are < 5%. These values are within the acceptable limits mentioned in the ISO 13320 standard.

Applicant's summary and conclusion

Conclusions:

Particle size distribution of the substance: D10= 44.8 µm, D50= 202 µm and D90= 547 µm. The MMAD was calculated to be 218 µm. 0.9% by volume of test item was determined to be smaller than 10 μm (<9.86 μm).

Executive summary:

Laser diffraction analysis (medium volume wet module) was performed in a GLP study according to ISO 13320 and CIPAC MT 187. Each result is the average of five runs. 

The D50 of the test item was determined to be 202 μm, the D10 was 44.8 μm and the D90 was 547 μm. 0.9% by volume of test item was determined to be smaller than 10 μm (<9.86 μm). The MMAD of the test item, from the relative density of 1.17 and the mean D50, was calculated to be 218 μm.