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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

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Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
July 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
Guideline:
other: ISO 2591-1; 3310-1
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: SMA 721.02; 743.02
Deviations:
no
Qualifier:
according to guideline
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:
0.03 %
No.:
#2
Size:
> 100 µm
Distribution:
99.97 %

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 that mainly irregular particles > 100 μm are present. However, it cannot be excluded that < 1%m/m of particles < 100 mm are present. Therefore sieving is performed.

Sieving: It is shown that virtually no particles (< 1%m/m) pass the sieve. Consequently no PSD was determined.

Conclusions:
The granulometry of Dioctanoyl peroxide 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 might contain some particles < 100 μm. However, virtually no particles pass the 100 mm sieve (< 1%m/m). Therefore no PSD
measurement was performed.
Executive summary:

Light microscopic examination revealed that the product might contain some particles < 100 μm. However, virtually no particles pass the 100 mm sieve (< 1%m/m). Therefore no PSD measurement was performed.

Description of key information

Virtually no particles pass the 100 mm sieve (< 0.03 %). Consequently no PSD was measured.

Additional information