Zinc oxide

Nanomaterial pour density

Administrative data

Endpoint:

nanomaterial pour density

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The study was regarded as scientifically acceptable. However, only limited documentation of the data evaluation was provided in the full study report. It is not clear how the data of the bulk density was determined. In the study report the experimental determination of the tap density and the calculation of the carr index where roughly described. According to the OECD guidance the procedure for pour density measurements is described in ASTM Standard D1513 – 05e2. Due to the limited documentation it was not possible to assess if the data were obtained in accordance with recognised guidance. The provided results for density are not consistent with the data on particle size which were in general regarded as reliable. This, inconsistence might be caused by different parameter (e.g. sample preparation, representative sample). Thus, it was not possible to finally conclude on pour density.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Qualifier:

no guideline followed

GLP compliance:

no

Type of method:

other: tapped density

Details on methods and data evaluation:

Using a Copley JV2000, a known mass of the dry sample was placed into a measuring cylinder to a recorded volume and ‘tapped’ by mechanically raising and lowering by a set distance until a consistent volume was reached, which corresponds to the maximum packing density of the material.

Test material

Test material information

Constituent 1

Reference substance name:

Zinc oxide

EC Number:

215-222-5

EC Name:

Zinc oxide

Cas Number:

1314-13-2

Molecular formula:

ZnO

IUPAC Name:

oxozinc

Test material form:

solid: nanoform

Data gathering

Instruments:

Copley JV2000

Results and discussion

Any other information on results incl. tables

Sample	Bulk Density (g/cm3)	Tapped Density (g/cm3)	Carr Index
NM110	0.293	0.346	15.351
NM111	0.693	0.832	16.799
NM112	0.415	0.519	20.000
NM113	0.646	0.714	9.471

Applicant's summary and conclusion

Executive summary:

Escubed Ltd., 2012 determined the density of the nanomaterials using a Copley JV2000. A known mass of the dry sample was placed into a measuring cylinder to a recorded volume and tapped by mechanically raising and lowering by a set distance until a consistent volume was reached, which corresponds to the maximum packing density of the material. The Carr Index was calculated from the respective bulk and tapped densities.NM‑110 and NM‑111 have comparable particle size. NM‑112 was determined to have the smallest particle size compared to the other 3 nanomaterials and NM‑113 (“bulk material”) was determined to have the largest particle size. As the particle size directly influence the tapped density, this general trend should be observed in the density measurements. The provided results for density are not consistent with the data on particle size which were in general regarded as reliable. This, inconsistence might be caused by different parameter (e.g. sample preparation, representative sample). Thus, it was not possible to finally conclude on pour density.