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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to
Guideline:
other: ISO 2591-1; 3310-1
Deviations:
no
Qualifier:
according to
Guideline:
other: SMA 721.02; 743.02
Deviations:
no
Qualifier:
according to
Guideline:
other: DRAFT EUR 20268 EN
Deviations:
no
GLP compliance:
no
Other quality assurance:
other: ISO 9001
Type of method:
sieving
Type of particle tested:
primary particle
No.:
#1
Size:
< 100 µm
Distribution:
5.2 %
No.:
#2
Size:
> 100 µm
Distribution:
94.8 %
No.:
#3
Size:
< 10 µm
Distribution:
0.48 %
Remarks on result:
other: % of total product
No.:
#4
Size:
< 5 µm
Distribution:
0.22 %
Remarks on result:
other: % of total product

Light microscopic examinations:

Pictures of the sample were taken with the Stemi 2000-c microscope assembled with an

AxioCam ICc 3 digital camera.

This picture shows the flakes, with some smaller particles attached to them or loose. The shape of the product is non-fibrous. After sieving, another picture was taken from the fraction < 100 μm. The shape of these fines is also non-fibrous.

The characteristics of the PSD of the fraction < 100 μm are:

Characteristics of the PSD

d10 [μm] 10.6

d50 [μm] 49.4

d90 [μm] 110

From the whole product 0.48% is < 10 μm and 0.22% is < 5 μm.

Executive summary:

The granulometry of Ethyleneglycol dibenzoate was determined in accordance with

European Chemicals Agency (ECHA), Guidance on information requirements and chemical

safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008.

Light microscopic examination revealed that the product contains some fines in addition to

the flakes. The fraction < 100 μm resulting from sieving on a 100 μm screen is 5.2%m/m.

The PSD characteristics of this fraction are reported in the table below.

Characteristics of the PSD

d10 [μm] 10.6

d50 [μm] 49.4

d90 [μm] 110

From the whole product 0.48% is < 10 μm and 0.22% is < 5 μm.

.

Description of key information

The product form is mainly flakes, a fraction of 5.2% is < 100 μm. From the whole product 0.48% is < 10 μm and 0.22% is < 5 μm.

Additional information