Dimethyloctadecyl(3-sulphopropyl)ammonium hydroxide

Particle size distribution (Granulometry)

Administrative data

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2021

Report date:

2021

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)

GLP compliance:

no

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Test material

Test material information

1

Reference substance name:

Dimethyloctadecyl(3-sulphopropyl)ammonium hydroxide

EC Number:

236-124-9

EC Name:

Dimethyloctadecyl(3-sulphopropyl)ammonium hydroxide

Cas Number:

13177-41-8

Molecular formula:

C23H49NO3S

IUPAC Name:

dimethyl(octadecyl)(3-sulfopropyl)azanium hydroxide

Test material form:

solid

Results and discussion

Mass median aerodynamic diameter:

212.93 µm

Geometric standard deviation:

13.3

Remarks on result:

other: dispersion method GRADIS/L

Particle size

Particle size 1

Percentile:

D10

Mean:

5.36 µm

St. dev.:

0.03

Remarks on result:

other:

Remarks:

dispersion method RODOS/L with a dispersion pressure 3 bar

Particle size 2

Percentile:

D50

Mean:

20.27 µm

St. dev.:

0.09

Remarks on result:

other:

Remarks:

dispersion method RODOS/L with a dispersion pressure 3 bar

Particle size 3

Percentile:

D90

Mean:

91.93 µm

St. dev.:

1.83

Remarks on result:

other:

Remarks:

dispersion method RODOS/L with a dispersion pressure 3 bar

Particle size 4

Percentile:

D10

Mean:

40.16 µm

St. dev.:

0.42

Remarks on result:

other:

Remarks:

dispersion method GRADIS/L

Particle size 5

Percentile:

D50

Mean:

212.93 µm

St. dev.:

13.3

Remarks on result:

other:

Remarks:

dispersion method GRADIS/L

Particle size 6

Percentile:

D90

Mean:

739.11 µm

St. dev.:

10.05

Remarks on result:

other:

Remarks:

dispersion method GRADIS/L

Any other information on results incl. tables

The test substance Stearyl Sulfobetaine has a median particle size D50 = 212.93 ± 13.30 µm at the dispersion method GRADIS/L. a range of the particle size D50 = 25.61 – 29.24 µm at the dispersion method RO-DOS/L with a dispersion pressure 1 bar and a median particle size D50 = 20.27 ± 0.09 µm µm at the dispersion method RODOS/L with a dispersion pressure 3 bar.

The particle size distribution of the dry weak dispersion test method GRADIS/L showed, that the particle, as they exist, were agglomerated. The particle size distribution of the dry intense dispersion test method RODOS/L showed, that the particles were dispersed by the dispersion pressure to smaller particles. The change in particle size with increasing dispersion pressure could have been caused by dispersion or partic-le destruction.

The values for the particle size distribution at the pressure of 1 bar vary greatly.

This behaviour could be possible, as not all agglomerations and particles dispersed with 1 bar pressure.

All particles distributed similar with the pressure of 3 bar. This behaviour could be possible, as 3 bar pressure was enough to dispersed all particles or to destructed.

Applicant's summary and conclusion

Conclusions:

The test substance has a median particle size D50 = 212.93 ± 13.30 µm at the dispersion method GRADIS/L. a range of the particle size D50 = 25.61 – 29.24 µm at the dispersion method RO-DOS/L with a dispersion pressure 1 bar and a median particle size D50 = 20.27 ± 0.09 µm µm at the dispersion method RODOS/L with a dispersion pressure 3 bar.